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Vulnerability details: VCID-uesk-2pcc-qybz
Vulnerability ID VCID-uesk-2pcc-qybz
Aliases CVE-2021-29957
Summary If a MIME encoded email contains an OpenPGP inline signed or encrypted message part, but also contains an additional unprotected part, Thunderbird did not indicate that only parts of the message are protected.
Status Published
Exploitability 0.5
Weighted Severity 3.9
Risk 1.9
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-347 Improper Verification of Cryptographic Signature
System Score Found at
cvssv3 3.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29957.json
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
epss 0.00305 https://api.first.org/data/v1/epss?cve=CVE-2021-29957
cvssv3.1 3.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-29957
cvssv3.1 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-29957
archlinux Low https://security.archlinux.org/AVG-1964
generic_textual low https://www.mozilla.org/en-US/security/advisories/mfsa2021-22
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29957.json
https://api.first.org/data/v1/epss?cve=CVE-2021-29957
https://bugzilla.mozilla.org/show_bug.cgi?id=1673241
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29956
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29957
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29967
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2021-22/
1961503 https://bugzilla.redhat.com/show_bug.cgi?id=1961503
ASA-202105-29 https://security.archlinux.org/ASA-202105-29
AVG-1964 https://security.archlinux.org/AVG-1964
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-2021-29957 https://nvd.nist.gov/vuln/detail/CVE-2021-29957
mfsa2021-22 https://www.mozilla.org/en-US/security/advisories/mfsa2021-22
RHSA-2021:2261 https://access.redhat.com/errata/RHSA-2021:2261
RHSA-2021:2262 https://access.redhat.com/errata/RHSA-2021:2262
RHSA-2021:2263 https://access.redhat.com/errata/RHSA-2021:2263
RHSA-2021:2264 https://access.redhat.com/errata/RHSA-2021:2264
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:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29957.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:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/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

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29957
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:R/S:U/C:N/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29957
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 0.53307
EPSS Score 0.00305
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:49.366542+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2021/mfsa2021-22.yml 37.0.0