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CVE record · CVE-2023-6858

Out-of-bounds write in Mozilla Firefox ESR and others

CVSS 8.8 HighEPSS 0.015 · 75th percentile

Published by the CVE Program (CNA: mozilla) at 19 Dec 2023, 13:38 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Mozilla Firefox ESR
  • affected unspecified to before 115.6 custom
Mozilla Thunderbird
  • affected unspecified to before 115.6 custom
Mozilla Firefox
  • affected unspecified to before 121 custom
Identifiers
CVE-2023-6858
CNA
mozilla
Weakness (CWE)
CWE-787
Tags
Published
19 Dec 2023
Updated
7 May 2025

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.8 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H ADP (CISA-ADP)
  • CISA KEV Not listed.
  • EPSS 0.015, the 75th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 19 Dec 2023. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.