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Vulnerability details: VCID-ckpp-dehs-k3az
Vulnerability ID VCID-ckpp-dehs-k3az
Aliases CVE-2021-29949
Summary When loading the shared library that provides the OTR protocol implementation, Thunderbird will initially attempt to open it using a filename that isn't distributed by Thunderbird. If a computer has already been infected with a malicious library of the alternative filename, and the malicious library has been copied to a directory that is contained in the search path for executable libraries, then Thunderbird will load the incorrect library.
Status Published
Exploitability 0.5
Weighted Severity 7.0
Risk 3.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-426 Untrusted Search Path
CWE-427 Uncontrolled Search Path Element
System Score Found at
cvssv3 7.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29949.json
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2021-29949
cvssv3.1 4.2 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.4 https://nvd.nist.gov/vuln/detail/CVE-2021-29949
cvssv3.1 7.8 https://nvd.nist.gov/vuln/detail/CVE-2021-29949
archlinux Medium https://security.archlinux.org/AVG-1790
generic_textual none https://www.mozilla.org/en-US/security/advisories/mfsa2021-13
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29949.json
https://api.first.org/data/v1/epss?cve=CVE-2021-29949
https://bugzilla.mozilla.org/show_bug.cgi?id=1682101
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23961
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23991
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23992
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23993
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23994
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23995
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23998
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23999
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-24002
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29945
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29946
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29948
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29949
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2021-13/
1951872 https://bugzilla.redhat.com/show_bug.cgi?id=1951872
AVG-1790 https://security.archlinux.org/AVG-1790
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-2021-29949 https://nvd.nist.gov/vuln/detail/CVE-2021-29949
mfsa2021-13 https://www.mozilla.org/en-US/security/advisories/mfsa2021-13
RHSA-2021:1190 https://access.redhat.com/errata/RHSA-2021:1190
RHSA-2021:1192 https://access.redhat.com/errata/RHSA-2021:1192
RHSA-2021:1193 https://access.redhat.com/errata/RHSA-2021:1193
RHSA-2021:1201 https://access.redhat.com/errata/RHSA-2021:1201
USN-4995-1 https://usn.ubuntu.com/4995-1/
USN-4995-2 https://usn.ubuntu.com/4995-2/
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29949.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:3.1/AV:L/AC:H/PR:L/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:L/AC:M/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29949
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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29949
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 0.19818
EPSS Score 0.00063
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:48.262764+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2021/mfsa2021-13.yml 37.0.0