CVE-2025-5271

MEDIUM EPSS 15.8%
Published May 27, 20251y ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Medium
Find Similar
Published May 27, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

Description

Previewing a response in Devtools ignored CSP headers, which could have allowed content injection attacks. This vulnerability was fixed in Firefox 139 and Thunderbird 139.

CVSS Details

Base Score
6.5
Exploitability
3.9
Impact
2.5
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
15.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-116

Affected Products 1

VendorProductVersionRange
mozillafirefox* <139.0

References 3

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1920348
    Permissions Required
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-42/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-45/

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.