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Vulnerability details: VCID-e56e-1t6d-aaaa
Vulnerability ID VCID-e56e-1t6d-aaaa
Aliases CVE-2019-11727
Summary A vulnerability exists where it possible to force Network Security Services (NSS) to sign CertificateVerify with PKCS#1 v1.5 signatures when those are the only ones advertised by server in CertificateRequest in TLS 1.3. PKCS#1 v1.5 signatures should not be used for TLS 1.3 messages. This vulnerability affects Firefox < 68.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-295 Improper Certificate Validation
CWE-327 Use of a Broken or Risky Cryptographic Algorithm
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-11727.html
rhas Moderate https://access.redhat.com/errata/RHSA-2020:4076
cvssv3 3.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11727.json
epss 0.00123 https://api.first.org/data/v1/epss?cve=CVE-2019-11727
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rhbs low https://bugzilla.redhat.com/show_bug.cgi?id=1730988
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11727
cvssv3 5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2019-11727
cvssv3 5.3 https://nvd.nist.gov/vuln/detail/CVE-2019-11727
archlinux Critical https://security.archlinux.org/AVG-1002
generic_textual Medium https://ubuntu.com/security/notices/USN-4054-1
generic_textual Medium https://ubuntu.com/security/notices/USN-4060-1
generic_textual Medium https://usn.ubuntu.com/usn/usn-4054-1
generic_textual Medium https://usn.ubuntu.com/usn/usn-4060-1
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-21
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2019-21/#CVE-2019-11727
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-28
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00006.html
http://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-11727.html
https://access.redhat.com/errata/RHSA-2019:1951
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11727.json
https://api.first.org/data/v1/epss?cve=CVE-2019-11727
https://bugzilla.mozilla.org/show_bug.cgi?id=1552208
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11727
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.gentoo.org/glsa/201908-12
https://ubuntu.com/security/notices/USN-4054-1
https://ubuntu.com/security/notices/USN-4060-1
https://usn.ubuntu.com/usn/usn-4054-1
https://usn.ubuntu.com/usn/usn-4060-1
https://www.mozilla.org/en-US/security/advisories/mfsa2019-21/#CVE-2019-11727
https://www.mozilla.org/security/advisories/mfsa2019-21/
1730988 https://bugzilla.redhat.com/show_bug.cgi?id=1730988
ASA-201907-4 https://security.archlinux.org/ASA-201907-4
AVG-1002 https://security.archlinux.org/AVG-1002
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
CVE-2019-11727 https://nvd.nist.gov/vuln/detail/CVE-2019-11727
mfsa2019-21 https://www.mozilla.org/en-US/security/advisories/mfsa2019-21
mfsa2019-28 https://www.mozilla.org/en-US/security/advisories/mfsa2019-28
RHSA-2020:4076 https://access.redhat.com/errata/RHSA-2020:4076
RHSA-2021:0949 https://access.redhat.com/errata/RHSA-2021:0949
USN-4054-1 https://usn.ubuntu.com/4054-1/
USN-4060-1 https://usn.ubuntu.com/4060-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11727.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

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L 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

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11727
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11727
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
Exploit Prediction Scoring System (EPSS)
Percentile 0.28305
EPSS Score 0.00123
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.