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CVE-2025-3029

URL Bar Spoofing via non-BMP Unicode characters

Published: Apr 1, 2025Updated: Apr 13, 2026 Sources: CVE List NVD BDUCWE-290
NVD MITRE
7.3CVSSHIGH
EPSS Score
0.3%
Top 78.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-290

Affected Products

FirefoxMozilla
On-premDesktop App
Consumer Software / browser
ThunderbirdMozilla
On-premDesktop App
Communications / email-server-client
firefoxmozilla
On-premDesktop App
Consumer Software / browser
thunderbirdmozilla
On-premDesktop App
Communications / email-server-client
Suse Linux Enterprise DesktopNovell Inc.
On-premOS
Operating Systems / linux-distro
mozillaoss-projectUSConsumer Softwareaka mozilla corp.
novell inc.commercialUSOperating Systems
and 27 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1952213
bugzilla.mozilla.org
https://www.mozilla.org/security/advisories/mfsa2025-20/
mozilla.org
https://www.mozilla.org/security/advisories/mfsa2025-22/
mozilla.org
and 10 more references View all →

Timeline

Published
Apr 1, 2025
Last Updated
Apr 13, 2026

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