7.5

CVE-2025-1937: mozilla firefox

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2025-1937DEBIAN-CVE-2025-1937CGA-fg83-f977-995c
Published 04-03-2025Last modified 13-04-2026
Open JSON

Vulnerability summary

CVE-2025-1937 is a high (CVSS 7.5) vulnerability in mozilla firefox. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 45.6% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.56%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 33 · Related 9
DLA-4078-1DLA-4081-1DSA-5874-1DSA-5876-1MGASA-2025-0092MGASA-2025-0093

Timeline

  1. 04-03-2025
    PublishedVulnerability first disclosed.
  2. 13-04-2026
    Last modifiedVulnerability information updated.

Description

Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, and Thunderbird 128.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.56%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

+0.01 pp

From 0.55% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.56%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (bugzilla.mozilla.org)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Ubuntu9 products
  • firefox< 136.0+build3-0ubuntu0.20.04.1
  • mozjs102All versions (No fix recorded)
  • mozjs115All versions (No fix recorded)
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
Chainguard2 products
  • firefox< 136-r0
  • firefox-esr< 136-r0
Debian2 products
  • firefox-esr< 128.8.0esr-1~deb12u1 | < 128.8.0esr-1
  • thunderbird< 1:128.8.0esr-1~deb12u1 | < 1:128.8.0esr-1
Mozilla2 products
Wolfi1 product
  • firefox< 136-r0

5 vendors · 16 products

References

15 links
Show all 15 references