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Vulnerability details: VCID-58yq-u26g-qkdd
Vulnerability ID VCID-58yq-u26g-qkdd
Aliases CVE-2021-29985
Summary A use-after-free vulnerability in media channels could have led to memory corruption and a potentially exploitable crash.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29985.json
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00354 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00354 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00354 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00354 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00354 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
epss 0.00354 https://api.first.org/data/v1/epss?cve=CVE-2021-29985
cvssv3.1 6.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2021-29985
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-29985
archlinux High https://security.archlinux.org/AVG-2269
archlinux High https://security.archlinux.org/AVG-2270
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-33
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-34
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-35
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-36
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29985.json
https://api.first.org/data/v1/epss?cve=CVE-2021-29985
https://bugzilla.mozilla.org/show_bug.cgi?id=1722083
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29980
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29984
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29985
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29986
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29988
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29989
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.gentoo.org/glsa/202202-03
https://security.gentoo.org/glsa/202208-14
https://www.mozilla.org/security/advisories/mfsa2021-33/
https://www.mozilla.org/security/advisories/mfsa2021-34/
https://www.mozilla.org/security/advisories/mfsa2021-35/
https://www.mozilla.org/security/advisories/mfsa2021-36/
1992422 https://bugzilla.redhat.com/show_bug.cgi?id=1992422
ASA-202108-14 https://security.archlinux.org/ASA-202108-14
AVG-2269 https://security.archlinux.org/AVG-2269
AVG-2270 https://security.archlinux.org/AVG-2270
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:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
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-2021-29985 https://nvd.nist.gov/vuln/detail/CVE-2021-29985
mfsa2021-33 https://www.mozilla.org/en-US/security/advisories/mfsa2021-33
mfsa2021-34 https://www.mozilla.org/en-US/security/advisories/mfsa2021-34
mfsa2021-35 https://www.mozilla.org/en-US/security/advisories/mfsa2021-35
mfsa2021-36 https://www.mozilla.org/en-US/security/advisories/mfsa2021-36
RHSA-2021:3154 https://access.redhat.com/errata/RHSA-2021:3154
RHSA-2021:3155 https://access.redhat.com/errata/RHSA-2021:3155
RHSA-2021:3156 https://access.redhat.com/errata/RHSA-2021:3156
RHSA-2021:3157 https://access.redhat.com/errata/RHSA-2021:3157
RHSA-2021:3159 https://access.redhat.com/errata/RHSA-2021:3159
RHSA-2021:3160 https://access.redhat.com/errata/RHSA-2021:3160
RHSA-2021:3161 https://access.redhat.com/errata/RHSA-2021:3161
RHSA-2021:3162 https://access.redhat.com/errata/RHSA-2021:3162
USN-5037-1 https://usn.ubuntu.com/5037-1/
USN-5058-1 https://usn.ubuntu.com/5058-1/
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-2021-29985.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:L/PR:N/UI:R/S:C/C:L/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:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29985
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:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29985
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 0.52412
EPSS Score 0.00295
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:45.882228+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2021/mfsa2021-35.yml 37.0.0