CVE-2025-3029

URL Bar Spoofing via non-BMP Unicode characters

CVSS 7.3 HIGHEPSS 0.3%CWE-290

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.3EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

01 Apr 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

A crafted URL containing specific Unicode characters could have hidden the true origin of the page, resulting in a potential spoofing attack. This vulnerability was fixed in Firefox 137, Firefox ESR 128.9, Thunderbird 137, and Thunderbird 128.9.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

Mozilla · Firefox Mozilla · Thunderbird

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References

https://bugzilla.mozilla.org/show_bug.cgi?id=1952213 https://lists.debian.org/debian-lts-announce/2025/04/msg00005.html https://www.mozilla.org/security/advisories/mfsa2025-20/https://www.mozilla.org/security/advisories/mfsa2025-22/https://www.mozilla.org/security/advisories/mfsa2025-23/https://www.mozilla.org/security/advisories/mfsa2025-24/