High severity · published Dec 19, 2023
CVE-2023-6858
Firefox was susceptible to a heap buffer overflow in `nsTextFragment` due to insufficient OOM handling
8.8
CVSS
1.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 75% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 121.0 · source: NVD
DL
Debian Linux · Debian
10.0; 11.0; 12.0 · source: NVD
FE
Firefox Esr · Mozilla
before 115.6 · source: NVD
TH
Thunderbird · Mozilla
before 115.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-6858
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-6858
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
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