Exploited
critical
10
EPSS
0.049%
Advisory Published
CVE Published
Updated

CVE-2025-2857

First published: Thu Mar 27 2025(Updated: )

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 affects Firefox < 136.0.4, Firefox ESR < 128.8.1, and Firefox ESR < 115.21.1.

Credit: security@mozilla.org

Affected SoftwareAffected VersionHow to fix
Firefox<136.0.4
136.0.4
Firefox ESR<115.21.1
115.21.1
Firefox ESR<128.8.1
128.8.1

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of CVE-2025-2857?

    CVE-2025-2857 has been classified as a high-severity vulnerability due to its potential for sandbox escape.

  • How do I fix CVE-2025-2857?

    You can fix CVE-2025-2857 by updating to the latest version of Firefox or Firefox ESR as specified in the vulnerability details.

  • What versions of Firefox are affected by CVE-2025-2857?

    CVE-2025-2857 affects Firefox versions up to 136.0.4 and Firefox ESR versions up to 115.21.1 and 128.8.1.

  • Can CVE-2025-2857 be exploited remotely?

    Yes, CVE-2025-2857 can potentially be exploited remotely if a targeted child process is compromised.

  • What type of vulnerability is CVE-2025-2857?

    CVE-2025-2857 is a sandbox escape vulnerability that allows a compromised child process to gain elevated privileges.

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