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Vulnerability details: VCID-dedv-96fb-vyhp
Vulnerability ID VCID-dedv-96fb-vyhp
Aliases CVE-2021-29967
Summary Multiple vulnerabilities have been found in Mozilla Thunderbird, the worst of which could result in the arbitrary execution of code.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29967.json
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
epss 0.00365 https://api.first.org/data/v1/epss?cve=CVE-2021-29967
archlinux High https://security.archlinux.org/AVG-2018
archlinux High https://security.archlinux.org/AVG-2035
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-23
generic_textual none https://www.mozilla.org/en-US/security/advisories/mfsa2021-24
generic_textual none https://www.mozilla.org/en-US/security/advisories/mfsa2021-26
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29967.json
https://api.first.org/data/v1/epss?cve=CVE-2021-29967
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
1966831 https://bugzilla.redhat.com/show_bug.cgi?id=1966831
ASA-202106-22 https://security.archlinux.org/ASA-202106-22
ASA-202106-3 https://security.archlinux.org/ASA-202106-3
AVG-2018 https://security.archlinux.org/AVG-2018
AVG-2035 https://security.archlinux.org/AVG-2035
GLSA-202208-14 https://security.gentoo.org/glsa/202208-14
mfsa2021-23 https://www.mozilla.org/en-US/security/advisories/mfsa2021-23
mfsa2021-24 https://www.mozilla.org/en-US/security/advisories/mfsa2021-24
mfsa2021-26 https://www.mozilla.org/en-US/security/advisories/mfsa2021-26
RHSA-2021:2206 https://access.redhat.com/errata/RHSA-2021:2206
RHSA-2021:2208 https://access.redhat.com/errata/RHSA-2021:2208
RHSA-2021:2214 https://access.redhat.com/errata/RHSA-2021:2214
RHSA-2021:2233 https://access.redhat.com/errata/RHSA-2021:2233
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-4978-1 https://usn.ubuntu.com/4978-1/
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:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29967.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
Exploit Prediction Scoring System (EPSS)
Percentile 0.58386
EPSS Score 0.00365
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:58:33.853138+00:00 Gentoo Importer Import https://security.gentoo.org/glsa/202208-14 38.0.0