9.8

CVE-2025-8028: mozilla firefox

CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2025-8028DEBIAN-CVE-2025-8028CGA-93xf-769x-28j5
Published 22-07-2025Last modified 29-07-2026
Open JSON

Vulnerability summary

CVE-2025-8028 is a critical (CVSS 9.8) vulnerability in mozilla firefox. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 44.5% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.54%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 37 · Related 12
DLA-4250-1DLA-4253-1DSA-5964-1DSA-5966-1MGASA-2025-0227MGASA-2025-0228

Timeline

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

Description

On arm64, a WASM `br_table` instruction with a lot of entries could lead to the label being too far from the instruction causing truncation and incorrect computation of the branch address. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.54%

Chance of exploitation in the next 30 days

Percentile

45%

Versus all other CVEs

30-day change

+0.03 pp

From 0.51% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.54%

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< 128.13-r0
  • firefox-esr< 140.1-r0
Debian2 products
  • firefox-esr< 128.13.0esr-1~deb12u1 | < 128.13.0esr-1
  • thunderbird< 1:128.13.0esr-1~deb12u1 | < 1:128.13.0esr-1
Mozilla2 products
  • firefox< 115.26.0 | < 141.0 | ≥ 128.0, < 128.13.0 | ≥ 140.0, < 140.1.0
  • thunderbird< 128.13.0 | < 141.0 | ≥ 140.0, < 140.1.0
Wolfi1 product
  • firefox< 128.13-r0

5 vendors · 15 products

References

16 links
Show all 16 references