CVE-2023-6212 — Memory safety bugs present in Firefox 119, Firefox ESR 115
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. This vulnerability affects Firefox &l
Published
2023-11-21T14:28:54.749Z
Last modified
2025-02-13T17:26:14.068Z
01What is this vulnerability?
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. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.
02Affected products
| Vendor | Product | Versions |
|---|
| Mozilla | Firefox | unspecified |
| Mozilla | Firefox ESR | unspecified |
| Mozilla | Thunderbird | unspecified |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2023-11-21T14:28:54.749Z
- Last modified: 2025-02-13T17:26:14.068Z
09References
- bugzilla.mozilla.org — https://bugzilla.mozilla.org/buglist.cgi?bug_id=1658432%2C1820983%2C1829252%2C18…
- www.mozilla.org — https://www.mozilla.org/security/advisories/mfsa2023-49/
- www.mozilla.org — https://www.mozilla.org/security/advisories/mfsa2023-50/
- www.mozilla.org — https://www.mozilla.org/security/advisories/mfsa2023-52/
- www.debian.org — https://www.debian.org/security/2023/dsa-5561
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/11/msg00017.html
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/11/msg00030.html
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