Insufficient Newline Escaping in Firefox's Copy as cURL Feature
CVE-2025-5264

4.8MEDIUM

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
27 May 2025

What is CVE-2025-5264?

A security flaw exists in the 'Copy as cURL' feature of Firefox and its Extended Support Release (ESR) versions, where the newline character is not properly escaped. This imperfection can be exploited by an attacker, manipulating the command to facilitate local code execution on the target user's system. Affected versions include Firefox versions below 139 and Firefox ESR versions below 115.24 and 128.11, which may put users at risk without proper mitigation.

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Affected Version(s)

Firefox < 139

Firefox ESR < 115.24

Firefox ESR < 128.11

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1950001
https://www.mozilla.org/security/advisories/mfsa2025-42/
https://www.mozilla.org/security/advisories/mfsa2025-43/

CVSS V3.1

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ameen Basha M K
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