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Vulnerability details: VCID-szfx-665h-w3eb
Vulnerability ID VCID-szfx-665h-w3eb
Aliases CVE-2019-12855
GHSA-65rm-h285-5cc5
PYSEC-2019-129
Summary In words.protocols.jabber.xmlstream in Twisted through 19.2.1, XMPP support did not verify certificates when used with TLS, allowing an attacker to MITM connections.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-295 Improper Certificate Validation
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3.1 7.4 http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00013.html
cvssv4 9.1 http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00013.html
generic_textual CRITICAL http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00013.html
cvssv3.1 7.4 http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00028.html
cvssv4 9.1 http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00028.html
generic_textual CRITICAL http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00028.html
cvssv3 7.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-12855.json
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
epss 0.00646 https://api.first.org/data/v1/epss?cve=CVE-2019-12855
cvssv3 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-65rm-h285-5cc5
cvssv3.1 7.4 https://github.com/pypa/advisory-database/tree/main/vulns/twisted/PYSEC-2019-129.yaml
cvssv4 9.1 https://github.com/pypa/advisory-database/tree/main/vulns/twisted/PYSEC-2019-129.yaml
generic_textual CRITICAL https://github.com/pypa/advisory-database/tree/main/vulns/twisted/PYSEC-2019-129.yaml
cvssv3.1 7.4 https://github.com/twisted/twisted
cvssv4 9.1 https://github.com/twisted/twisted
generic_textual CRITICAL https://github.com/twisted/twisted
cvssv3.1 7.4 https://github.com/twisted/twisted/pull/1147
cvssv4 9.1 https://github.com/twisted/twisted/pull/1147
generic_textual CRITICAL https://github.com/twisted/twisted/pull/1147
cvssv3.1 7.4 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
cvssv4 9.1 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
generic_textual CRITICAL https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
cvssv3.1 7.4 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
cvssv4 9.1 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
generic_textual CRITICAL https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
cvssv3.1 7.4 https://nvd.nist.gov/vuln/detail/CVE-2019-12855
cvssv4 9.1 https://nvd.nist.gov/vuln/detail/CVE-2019-12855
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2019-12855
cvssv3.1 7.4 https://twistedmatrix.com/trac/ticket/9561
cvssv4 9.1 https://twistedmatrix.com/trac/ticket/9561
generic_textual CRITICAL https://twistedmatrix.com/trac/ticket/9561
cvssv3.1 7.4 https://usn.ubuntu.com/4308-1
cvssv4 9.1 https://usn.ubuntu.com/4308-1
generic_textual CRITICAL https://usn.ubuntu.com/4308-1
cvssv3.1 7.4 https://usn.ubuntu.com/4308-2
cvssv4 9.1 https://usn.ubuntu.com/4308-2
generic_textual CRITICAL https://usn.ubuntu.com/4308-2
cvssv3.1 7.4 https://www.oracle.com/security-alerts/cpuapr2020.html
cvssv4 9.1 https://www.oracle.com/security-alerts/cpuapr2020.html
generic_textual CRITICAL https://www.oracle.com/security-alerts/cpuapr2020.html
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00013.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00028.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-12855.json
https://api.first.org/data/v1/epss?cve=CVE-2019-12855
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12855
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/advisories/GHSA-65rm-h285-5cc5
https://github.com/pypa/advisory-database/tree/main/vulns/twisted/PYSEC-2019-129.yaml
https://github.com/twisted/twisted
https://github.com/twisted/twisted/pull/1147
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ/
https://nvd.nist.gov/vuln/detail/CVE-2019-12855
https://twistedmatrix.com/trac/ticket/9561
https://usn.ubuntu.com/4308-1
https://usn.ubuntu.com/4308-1/
https://usn.ubuntu.com/4308-2
https://usn.ubuntu.com/4308-2/
https://www.oracle.com/security-alerts/cpuapr2020.html
1728206 https://bugzilla.redhat.com/show_bug.cgi?id=1728206
930626 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=930626
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00013.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00013.html
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00028.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00028.html
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-12855.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/pypa/advisory-database/tree/main/vulns/twisted/PYSEC-2019-129.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://github.com/pypa/advisory-database/tree/main/vulns/twisted/PYSEC-2019-129.yaml
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/twisted/twisted
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://github.com/twisted/twisted
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/twisted/twisted/pull/1147
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://github.com/twisted/twisted/pull/1147
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-12855
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-12855
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://twistedmatrix.com/trac/ticket/9561
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://twistedmatrix.com/trac/ticket/9561
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://usn.ubuntu.com/4308-1
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://usn.ubuntu.com/4308-1
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://usn.ubuntu.com/4308-2
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://usn.ubuntu.com/4308-2
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://www.oracle.com/security-alerts/cpuapr2020.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://www.oracle.com/security-alerts/cpuapr2020.html
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.70648
EPSS Score 0.00646
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:42:01.231356+00:00 Pypa Importer Import https://github.com/pypa/advisory-database/blob/main/vulns/twisted/PYSEC-2019-129.yaml 38.0.0