What’s Vulnerable › Vulnerabilities

CVE-2023-29539

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-06-02 · updated 2026-10-23
• Weakness: CWE-476

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.

Affected products

• Mozilla Firefox: before 112.0 — fixed in 112.0
• Mozilla Firefox ESR: before 102.10 — fixed in 102.10
• Mozilla Firefox for Android: before 112.0 — fixed in 112.0
• Mozilla Focus: before 112.0 — fixed in 112.0
• Mozilla Thunderbird: before 102.10 — fixed in 102.10

How to fix

Upgrade to a fixed version: Mozilla Firefox 112.0; Mozilla Firefox ESR 102.10; Mozilla Firefox for Android 112.0; Mozilla Focus 112.0; Mozilla Thunderbird 102.10. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1784348
• https://www.mozilla.org/security/advisories/mfsa2023-13/
• https://www.mozilla.org/security/advisories/mfsa2023-14/
• https://www.mozilla.org/security/advisories/mfsa2023-15/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1784348
• https://www.mozilla.org/security/advisories/mfsa2023-13/
• https://www.mozilla.org/security/advisories/mfsa2023-14/
• https://www.mozilla.org/security/advisories/mfsa2023-15/

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