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Vulnerability details: VCID-1zj8-9xa4-eydr
Vulnerability ID VCID-1zj8-9xa4-eydr
Aliases CVE-2023-6212
Summary Memory safety bugs present in Firefox 119, Firefox ESR 115.4, and Thunderbird 115.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-787 Out-of-bounds Write
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-6212.json
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
epss 0.0034 https://api.first.org/data/v1/epss?cve=CVE-2023-6212
ssvc Track https://bugzilla.mozilla.org/buglist.cgi?bug_id=1658432%2C1820983%2C1829252%2C1856072%2C1856091%2C1859030%2C1860943%2C1862782
ssvc Track https://lists.debian.org/debian-lts-announce/2023/11/msg00017.html
ssvc Track https://lists.debian.org/debian-lts-announce/2023/11/msg00030.html
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2023-6212
ssvc Track https://www.debian.org/security/2023/dsa-5561
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2023-49
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2023-50
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2023-52
ssvc Track https://www.mozilla.org/security/advisories/mfsa2023-49/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2023-50/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2023-52/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-6212.json
https://api.first.org/data/v1/epss?cve=CVE-2023-6212
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6204
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6205
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6206
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6207
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6208
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6209
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6212
2250902 https://bugzilla.redhat.com/show_bug.cgi?id=2250902
buglist.cgi?bug_id=1658432%2C1820983%2C1829252%2C1856072%2C1856091%2C1859030%2C1860943%2C1862782 https://bugzilla.mozilla.org/buglist.cgi?bug_id=1658432%2C1820983%2C1829252%2C1856072%2C1856091%2C1859030%2C1860943%2C1862782
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:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*
CVE-2023-6212 https://nvd.nist.gov/vuln/detail/CVE-2023-6212
dsa-5561 https://www.debian.org/security/2023/dsa-5561
mfsa2023-49 https://www.mozilla.org/en-US/security/advisories/mfsa2023-49
mfsa2023-49 https://www.mozilla.org/security/advisories/mfsa2023-49/
mfsa2023-50 https://www.mozilla.org/en-US/security/advisories/mfsa2023-50
mfsa2023-50 https://www.mozilla.org/security/advisories/mfsa2023-50/
mfsa2023-52 https://www.mozilla.org/en-US/security/advisories/mfsa2023-52
mfsa2023-52 https://www.mozilla.org/security/advisories/mfsa2023-52/
msg00017.html https://lists.debian.org/debian-lts-announce/2023/11/msg00017.html
msg00030.html https://lists.debian.org/debian-lts-announce/2023/11/msg00030.html
RHSA-2023:7499 https://access.redhat.com/errata/RHSA-2023:7499
RHSA-2023:7500 https://access.redhat.com/errata/RHSA-2023:7500
RHSA-2023:7501 https://access.redhat.com/errata/RHSA-2023:7501
RHSA-2023:7502 https://access.redhat.com/errata/RHSA-2023:7502
RHSA-2023:7503 https://access.redhat.com/errata/RHSA-2023:7503
RHSA-2023:7504 https://access.redhat.com/errata/RHSA-2023:7504
RHSA-2023:7505 https://access.redhat.com/errata/RHSA-2023:7505
RHSA-2023:7506 https://access.redhat.com/errata/RHSA-2023:7506
RHSA-2023:7507 https://access.redhat.com/errata/RHSA-2023:7507
RHSA-2023:7508 https://access.redhat.com/errata/RHSA-2023:7508
RHSA-2023:7509 https://access.redhat.com/errata/RHSA-2023:7509
RHSA-2023:7510 https://access.redhat.com/errata/RHSA-2023:7510
RHSA-2023:7511 https://access.redhat.com/errata/RHSA-2023:7511
RHSA-2023:7512 https://access.redhat.com/errata/RHSA-2023:7512
RHSA-2023:7547 https://access.redhat.com/errata/RHSA-2023:7547
RHSA-2023:7569 https://access.redhat.com/errata/RHSA-2023:7569
RHSA-2023:7570 https://access.redhat.com/errata/RHSA-2023:7570
RHSA-2023:7573 https://access.redhat.com/errata/RHSA-2023:7573
RHSA-2023:7574 https://access.redhat.com/errata/RHSA-2023:7574
RHSA-2023:7577 https://access.redhat.com/errata/RHSA-2023:7577
USN-6509-1 https://usn.ubuntu.com/6509-1/
USN-6515-1 https://usn.ubuntu.com/6515-1/
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-2023-6212.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: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2023-11-22T18:37:05Z/ Found at https://bugzilla.mozilla.org/buglist.cgi?bug_id=1658432%2C1820983%2C1829252%2C1856072%2C1856091%2C1859030%2C1860943%2C1862782
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2023-11-22T18:37:05Z/ Found at https://lists.debian.org/debian-lts-announce/2023/11/msg00017.html
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2023-11-22T18:37:05Z/ Found at https://lists.debian.org/debian-lts-announce/2023/11/msg00030.html
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-2023-6212
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: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2023-11-22T18:37:05Z/ Found at https://www.debian.org/security/2023/dsa-5561
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2023-11-22T18:37:05Z/ Found at https://www.mozilla.org/security/advisories/mfsa2023-49/
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2023-11-22T18:37:05Z/ Found at https://www.mozilla.org/security/advisories/mfsa2023-50/
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2023-11-22T18:37:05Z/ Found at https://www.mozilla.org/security/advisories/mfsa2023-52/
Exploit Prediction Scoring System (EPSS)
Percentile 0.56028
EPSS Score 0.0034
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:34.888942+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2023/mfsa2023-50.yml 37.0.0