10

CVE-2025-2857: mozilla firefox Exposure of Resource to Wrong Sphere

CVSS: 10.0v3.1CriticalModified
AliasesCGA-qgfx-5c7m-2wvcCGA-xqxc-q655-q5r3openSUSE-SU-2025:14948-1
Published 27-03-2025Last modified 09-06-2026
Open JSON

Vulnerability summary

CVE-2025-2857 is a critical (CVSS 10.0) Exposure of Resource to Wrong Sphere vulnerability in mozilla firefox. EPSS estimates a 1.94% chance of exploitation in the next 30 days, higher than 79.7% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
10.0/10
010
Critical · v3.1 (CVE.org)
EPSS score
1.94%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 3
OPENSUSE-SU-2025:14958-1OPENSUSE-SU-2025:14961-1CGA-QH88-JXG3-GH53

Timeline

  1. 27-03-2025
    PublishedVulnerability first disclosed.
  2. 09-06-2026
    Last modifiedVulnerability information updated.

Description

Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in our IPC code. A compromised child process could cause the parent process to return an unintentionally powerful handle, leading to a sandbox escape. The original vulnerability was being exploited in the wild. *This only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 136.0.4, Firefox ESR 128.8.1, and Firefox ESR 115.21.1.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

1.94%

Chance of exploitation in the next 30 days

Percentile

80%

Versus all other CVEs

30-day change

+0.05 pp

From 1.89% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.94%

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

Chainguard2 products
  • firefox< 136.0.4-r0
  • firefox-esr< 136.0.4-r0
Mozilla1 product
  • firefox< 136.0.4 | < 115.21.1 | ≥ 128.1.0, < 128.8.1
Opensuse1 product
  • MozillaFirefox&distro=openSUSE Tumbleweed< 136.0.4-1.1
Wolfi1 product
  • firefox< 136.0.4-r0

4 vendors · 5 products

References

6 links