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No exploitation reportedFix available

CVE-2025-2857

No exploitation reported by the sources we read.

  • Published2025-03-27
  • Fixed in136.0.4 · 128.8.1 · 115.21.1
  • WeaknessCWE-668

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2025-03-2714:15CVE publishedNVD

Versions per branch

NVD
Mozilla firefox
BranchAffectedFixed in
136.0< 136.0.4136.0.4
128.x≥ 128.1.0, < 128.8.1128.8.1
115.21< 115.21.1115.21.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As mozilla, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Mozilla Firefox

    Not affected ≥ 115.21.1, ≤ 115.* · ≥ 128.8.1, ≤ 128.* · ≥ 136.0.4

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-04-13

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • firefoxWolfiall versions · fixed in 136.0.4-r0
  • firefoxChainguardall versions · fixed in 136.0.4-r0and 1 other package
  • firefox-esropenSUSE:Tumbleweedall versions · fixed in 128.9.0-1.1
  • MozillaFirefoxopenSUSE:Tumbleweedall versions · fixed in 136.0.4-1.1
  • mozjs128openSUSE:Tumbleweedall versions · fixed in 128.8.1-1.1

Vendor advisories

  • CVE-2025-2857 Red Hat Product Security

    firefox: Firefox IPC sandbox escape on windows

Full record on NVD

Fix

  1. Update Mozilla firefox to 136.0.4 · 128.8.1 · 115.21.1

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
2025-03-27
Last Modified
2026-10-05
NVD status
Modified
GitHub Advisory
GHSA-h8g5-2596-xjh9

Frequently asked questions

What is CVE-2025-2857?

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.

Is CVE-2025-2857 actively exploited?

Active exploitation of CVE-2025-2857 has not been confirmed. Its EPSS score was 2.0% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-2857?

CVE-2025-2857 has a CVSS v3 base score of 10 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

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