9.1

CVE-2025-8037: mozilla firefox

CVSS: 9.1v3.1CriticalModified
AliasesUBUNTU-CVE-2025-8037CGA-23wh-293r-jc4qCGA-hrj4-8vr4-4cj8
Published 22-07-2025Last modified 29-07-2026
Open JSON

Vulnerability summary

CVE-2025-8037 is a critical (CVSS 9.1) vulnerability in mozilla firefox. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.25%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 6 · Related 8
OPENSUSE-SU-2025:15371-1OPENSUSE-SU-2025:15383-1OPENSUSE-SU-2025:15386-1SUSE-SU-2025:02529-1SUSE-SU-2025:02531-1SUSE-SU-2025:02546-1

Timeline

  1. 22-07-2025
    PublishedVulnerability first disclosed.
  2. 29-07-2026
    Last modifiedVulnerability information updated.

Description

Setting a nameless cookie with an equals sign in the value shadowed other cookies. Even if the nameless cookie was set over HTTP and the shadowed cookie included the `Secure` attribute. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

+0.02 pp

From 0.22% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.25%

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< 140.1-r0
  • firefox-esr< 140.1-r0
Mozilla2 products
Wolfi1 product
  • firefox< 140.1-r0

4 vendors · 13 products

References

9 links