CVE-2023-6858

HIGH

Firefox < 121.0 and Firefox ESR < 115.6 - Heap Buffer Overflow in nsTextFragment

Title source: llm
STIX 2.1

Description

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.

Scores

CVSS v3 8.8
EPSS 0.0042
EPSS Percentile 61.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-787
Status published
Products (6)
debian/debian_linux 10.0
debian/debian_linux 11.0
debian/debian_linux 12.0
mozilla/firefox < 121.0
mozilla/firefox_esr < 115.6
mozilla/thunderbird < 115.6
Published Dec 19, 2023
Tracked Since Feb 18, 2026