Vulnerability · Published Apr 1, 2025 · Assigned by mozilla
CVE-2025-3029URL Bar Spoofing via non-BMP Unicode characters
High 7.3
In plain English
A high-severity authentication bypass by spoofing in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.4%top 70.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | firefox | 128.9.0-2.el8_10 | ALSA-2025:3582 |
| AlmaLinux:9 | firefox | 128.9.0-2.el9_5 | ALSA-2025:3556 |
| AlmaLinux:9 | firefox-x11 | 128.9.0-2.el9_5 | ALSA-2025:3556 |
| AlmaLinux:8 | thunderbird | 128.9.0-2.el8_10.alma.1 | ALSA-2025:4170 |
| AlmaLinux:9 | thunderbird | 128.9.0-2.el9_5.alma.1 | ALSA-2025:4169 |
| Debian:12 | firefox-esr | 128.9.0esr-1~deb12u1 | DEBIAN-CVE-2025-3029 |
| Debian:12 | firefox-esr | 128.9.0esr-1~deb12u1 | DSA-5889-1 |
| Debian:13 | firefox-esr | 128.9.0esr-1 | DEBIAN-CVE-2025-3029 |
| Debian:14 | firefox-esr | 128.9.0esr-1 | DEBIAN-CVE-2025-3029 |
| Debian:12 | thunderbird | 1:128.9.0esr-1~deb12u1 | DEBIAN-CVE-2025-3029 |
| Debian:12 | thunderbird | 1:128.9.0esr-1~deb12u1 | DSA-5891-1 |
| Debian:13 | thunderbird | 1:128.9.0esr-1 | DEBIAN-CVE-2025-3029 |
| Debian:14 | thunderbird | 1:128.9.0esr-1 | DEBIAN-CVE-2025-3029 |
| Rocky Linux:8 | firefox | 0:128.9.0-2.el8_10 | RLSA-2025:3582 |
| Rocky Linux:8 | thunderbird | 0:128.9.0-2.el8_10 | RLSA-2025:4170 |
| Ubuntu:22.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-3029 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-3029 |
| Ubuntu:24.04:LTS | mozjs115 | no fix listed | UBUNTU-CVE-2025-3029 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2025-3029 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2025-3029 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-3029 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | USN-7663-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | see references |
| Mozilla | Thunderbird | see references |
Weakness: CWE-290 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1952213
- 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/
- https://lists.debian.org/debian-lts-announce/2025/04/msg00005.html