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Vulnerability details: VCID-efm1-n7hj-x7b9
Vulnerability ID VCID-efm1-n7hj-x7b9
Aliases CVE-2019-11703
Summary A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting in a potentially exploitable crash.
Status Published
Exploitability 2.0
Weighted Severity 8.8
Risk 10.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-787 Out-of-bounds Write
CWE-122 Heap-based Buffer Overflow
System Score Found at
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11703.json
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
epss 0.08297 https://api.first.org/data/v1/epss?cve=CVE-2019-11703
cvssv3 9.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2019-11703
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2019-11703
archlinux High https://security.archlinux.org/AVG-980
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2019-17
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11703.json
https://api.first.org/data/v1/epss?cve=CVE-2019-11703
https://bugzilla.mozilla.org/show_bug.cgi?id=1553820
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11703
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11704
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11705
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11706
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.gentoo.org/glsa/201908-20
https://www.mozilla.org/security/advisories/mfsa2019-17/
1720001 https://bugzilla.redhat.com/show_bug.cgi?id=1720001
ASA-201906-10 https://security.archlinux.org/ASA-201906-10
AVG-980 https://security.archlinux.org/AVG-980
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
CVE-2019-11703 Exploit https://github.com/x41sec/advisories/tree/master/X41-2019-002
CVE-2019-11703 Exploit https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/dos/47003.txt
CVE-2019-11703 https://nvd.nist.gov/vuln/detail/CVE-2019-11703
mfsa2019-17 https://www.mozilla.org/en-US/security/advisories/mfsa2019-17
RHSA-2019:1623 https://access.redhat.com/errata/RHSA-2019:1623
RHSA-2019:1624 https://access.redhat.com/errata/RHSA-2019:1624
RHSA-2019:1626 https://access.redhat.com/errata/RHSA-2019:1626
USN-4028-1 https://usn.ubuntu.com/4028-1/
Data source Exploit-DB
Date added June 17, 2019
Description Thunderbird ESR < 60.7.XXX - 'parser_get_next_char' Heap-Based Buffer Overflow
Ransomware campaign use Unknown
Source publication date June 17, 2019
Exploit type dos
Platform multiple
Source update date June 17, 2019
Source URL https://github.com/x41sec/advisories/tree/master/X41-2019-002
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11703.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:L/PR:N/UI:N/S:U/C:H/I:H/A:H 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:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11703
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11703
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 0.91884
EPSS Score 0.08297
Published At Aug. 16, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:59.892910+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2019/mfsa2019-17.yml 37.0.0