CVE-2023-29539: mozilla firefox NULL Pointer Dereference
Vulnerability summary
CVE-2023-29539 is a high (CVSS 8.8) NULL Pointer Dereference vulnerability in mozilla firefox. EPSS estimates a 0.74% chance of exploitation in the next 30 days, higher than 53.6% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 31 · Related 9Timeline
- 02-06-2023PublishedVulnerability first disclosed.
- 09-01-2025Last modifiedVulnerability information updated.
Description
When handling the filename directive in the Content-Disposition header, the filename would be truncated if the filename contained a NULL character. This could have led to reflected file download attacks potentially tricking users to install malware. This vulnerability affects Firefox < 112, Focus for Android < 112, Firefox ESR < 102.10, Firefox for Android < 112, and Thunderbird < 102.10.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.74%
Chance of exploitation in the next 30 days
Percentile
54%
Versus all other CVEs
30-day change
0.00 pp
From 0.74% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Mozilla7 products
- firefox≥ unspecified, < 112 | < 112.0
- firefox_esr≥ unspecified, < 102.10 | < 102.10
- firefox for android≥ unspecified, < 112
- firefox_mobile< 112.0
- focus< 112.0
Ubuntu7 products
- firefox< 112.0+build2-0ubuntu0.18.04.1 | < 112.0+build2-0ubuntu0.20.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- mozjs78All versions (No fix recorded)
Debian2 products
- firefox-esr< 102.10.0esr-1
- thunderbird< 1:102.10.0-1
3 vendors · 16 products
References
12 links- www.mozilla.org/security/advisories/mfsa2023-15/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2023-14/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2023-13/Vendor Advisory
- bugzilla.mozilla.org/show_bug.cgi?id=1784348Issue Tracking
