Home/CVE/Firefox was susceptible to a heap buffer overflow in `nsTextFragment` due to insufficient OOM handling. This vulnerabili
CVE

CVE-2023-6858

Firefox was susceptible to a heap buffer overflow in `nsTextFragment` due to insufficient OOM handling. This vulnerabili

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.

HIGH · CVSS 8.8 EPSS 0.00417
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-787Out-of-bounds Write
CWE-787Out-of-bounds Write
▤

Affected Products & Versions

4
mozilla firefox< 121.0
mozilla firefox esr< 115.6
mozilla thunderbird< 115.6
debian linuxall versions
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSQLite Firefox Profile Data DB Access
▣

Scoring & Timeline

8.8
HIGH · CVSS v3.1 · security@mozilla.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD19 Dec 2023 · 02:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

29
msrcCVE-2023-6858
suse-csafopenSUSE-SU-2024:14572-1
suse-csafopenSUSE-SU-2024:13519-1
suse-csafopenSUSE-SU-2024:13531-1
suse-csafSUSE-SU-2024:0044-1
🔗

References & Sources

9
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.mozilla.org/show_bug.cgi?id=1826791Issue TrackingPermissions Required
https://lists.debian.org/debian-lts-announce/2023/12/msg00020.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/12/msg00021.htmlMailing ListThird Party Advisory
https://security.gentoo.org/glsa/202401-10Third Party Advisory
https://www.debian.org/security/2023/dsa-5581Third Party Advisory
https://www.debian.org/security/2023/dsa-5582Third Party Advisory
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