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Known exploited vulnerability · CISA KEV

CVE-2025-2783: Google Chromium Mojo Sandbox Escape Vulnerability

Google Chromium Mojo on Windows contains a sandbox escape vulnerability caused by a logic error, which results from an incorrect handle being provided in unspecified circumstances. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

CVE-2025-2783

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2025-03-27: attackers are using it right now.

CISA KEV
Listed
Added 2025-03-27 · federal fix-by 2025-04-17
EPSS (30 days)
9.2%
Higher than 95% of CVEs · 2026-11-01
CVSS v3.1
8.3 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

What CISA says

Google Chromium Mojo Sandbox Escape Vulnerability

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

NVD description · published 2025-03-26

Incorrect handle provided in unspecified circumstances in Mojo in Google Chrome on Windows prior to 134.0.6998.177 allowed a remote attacker to perform a sandbox escape via a malicious file. (Chromium security severity: High)

Full record on NVD

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How to check if you are exposed to CVE-2025-2783

  1. Find every Google Chromium Mojo system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2025-2783.

US federal agencies had to fix this by 2025-04-17. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Affected versions

Versions the National Vulnerability Database lists as vulnerable to CVE-2025-2783. Check the vendor advisory for the exact fixed builds before you sign anything off.

ProductVulnerable versions
Google Chromebefore 134.0.6998.177

Timeline

  1. · Published in the National Vulnerability Database
  2. · Added to CISA's Known Exploited Vulnerabilities catalog, 1 day after it was published
  3. · Fix-by date for US federal agencies, passed 563 days ago

Vendor advisories and fixes

More exploited Google vulnerabilities

CISA lists 76 exploited Google vulnerabilities. The closest matches:

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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