CVE-2023-6858

moderate-risk
Published 2023-12-19

Firefox was susceptible to a heap buffer overflow in `nsTextFragment` due to insufficient OOM handling. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

Do I need to act?

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0.42% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
NETWORK / LOW complexity

Affected Products (6)

Affected Vendors

Debian Mozilla

References (18)

Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1826791
Mailing List https://lists.debian.org/debian-lts-announce/2023/12/msg00020.html
Mailing List https://lists.debian.org/debian-lts-announce/2023/12/msg00021.html
Third Party Advisory https://security.gentoo.org/glsa/202401-10
Third Party Advisory https://www.debian.org/security/2023/dsa-5581
Third Party Advisory https://www.debian.org/security/2023/dsa-5582
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-54/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-55/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-56/
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1826791
Mailing List https://lists.debian.org/debian-lts-announce/2023/12/msg00020.html
Mailing List https://lists.debian.org/debian-lts-announce/2023/12/msg00021.html
Third Party Advisory https://security.gentoo.org/glsa/202401-10
Third Party Advisory https://www.debian.org/security/2023/dsa-5581
Third Party Advisory https://www.debian.org/security/2023/dsa-5582
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-54/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-55/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-56/
45
/ 100
moderate-risk
Severity 30/34 · Critical
Exploitability 2/34 · Minimal
Exposure 13/34 · Low