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CVE-2025-3029

URL Bar Spoofing via non-BMP Unicode characters

HIGH
7.3
CVSS Score
Published: April 1, 2025 at 12:28 PM UTC
Updated: October 5, 2026 at 03:10 PM UTC
2 products affected across 1 vendorFirefoxThunderbird

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Severity
HIGH7.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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 affects Firefox < 137, Firefox ESR < 128.9, Thunderbird < 137, and Thunderbird < 128.9.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 128.9.0v < 137.0
Vendor states this is fixed in 128.9 (unaffected)
Affected range stops below 128.9.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 137 (unaffected)
Affected range stops below 137.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 128.9.0129.0 ≤ v < 137.0
Vendor states this is fixed in 128.9 (unaffected)
Affected range stops below 128.9.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 137 (unaffected)
Affected range stops below 137.0, so it looks safe — our inference, not a vendor statement

References (6)

Issue TrackingPermissions Required
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1952213
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-20/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-22/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-23/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-24/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2025/04/msg00005.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.3HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-290

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