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CVE-2023-29539

HIGH
8.8
CVSS Score
Published: June 2, 2023 at 12:00 AM UTC
Updated: October 23, 2026 at 11:10 PM UTC
5 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity
HIGH8.8
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 112.0
Affected range stops below 112, so it looks safe — our inference, not a vendor statement
Affected range stops below 112.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 102.10
Affected range stops below 102.10, so it looks safe — our inference, not a vendor statement
Firefox Mobile· Mozilla
95%
v < 112.0
Affected range stops below 112.0, so it looks safe — our inference, not a vendor statement
Focus· Mozilla
95%
v < 112.0
Affected range stops below 112, so it looks safe — our inference, not a vendor statement
Affected range stops below 112.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 102.10
Affected range stops below 102.10, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Issue Tracking
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1784348
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2023-13/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2023-14/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2023-15/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-476

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