CVE-2025-6429

MEDIUM EPSS 20.2%
Published Jun 24, 20251y ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Medium
Find Similar
Published Jun 24, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

Description

Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an `embed` tag. This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

CVSS Details

Base Score
6.5
Exploitability
2.8
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality None
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
20.2% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-116

Affected Products 2

VendorProductVersionRange
mozillafirefox* <128.12.0
mozillafirefox* <140.0

References 7

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1970658
    Permissions Required
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-51/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-53/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-54/
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-55/

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.