7.3

CVE-2025-3029: mozilla firefox Authentication Bypass by Spoofing

CVSS: 7.3v3.1HighModified
AliasesUBUNTU-CVE-2025-3029DEBIAN-CVE-2025-3029CGA-3535-cvjc-q7c5
Published 01-04-2025Last modified 13-04-2026
Open JSON

Vulnerability summary

CVE-2025-3029 is a high (CVSS 7.3) Authentication Bypass by Spoofing vulnerability in mozilla firefox. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 27.1% of scored vulnerabilities.

Overall risk
29/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.3/10
010
High · v3.1 (CVE.org)
EPSS score
0.35%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 34 · Related 8
DLA-4109-1DLA-4110-1DSA-5889-1DSA-5891-1MGASA-2025-0125MGASA-2025-0126

Timeline

  1. 01-04-2025
    PublishedVulnerability first disclosed.
  2. 13-04-2026
    Last modifiedVulnerability information updated.

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 metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.35%

Chance of exploitation in the next 30 days

Percentile

27%

Versus all other CVEs

30-day change

+0.01 pp

From 0.34% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.35%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu8 products
  • mozjs102All versions (No fix recorded)
  • mozjs115All versions (No fix recorded)
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
  • mozjs68All versions (No fix recorded)
Chainguard2 products
  • firefox< 128.9-r0
  • firefox-esr< 128.9-r0
Debian2 products
  • firefox-esr< 128.9.0esr-1~deb12u1 | < 128.9.0esr-1
  • thunderbird< 1:128.9.0esr-1~deb12u1 | < 1:128.9.0esr-1
Mozilla2 products
Wolfi1 product
  • firefox< 128.9-r0

5 vendors · 15 products

References

13 links
Show all 13 references