CVE-2024-21639: CEF (Chromium Embedded Framework ) is a simple framework for embedding Chromium-based browsers in other applic

Q: How do I fix CVE-2024-21639?

chromium embedded framework: upgrade to 2024-01-05. Exact commands for each OS are on this page.

Q: Is CVE-2024-21639 being exploited?

CVE-2024-21639 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-21639 affect?

CVE-2024-21639 affects chromium embedded framework. Severity is medium (CVSS 5.3). CEF (Chromium Embedded Framework ) is a simple framework for embedding Chromium-based browsers in other applications. `CefLayeredWindowUpdaterOSR::OnAllocatedSharedMemory` does not check the size of the shared memory, which leads to out-of-

Q: How urgent is CVE-2024-21639?

Priority 37/100. Public exploit reference

Routine

MEDIUM 5.3UPGRADE

CVE-2024-21639 is a medium-severity flaw (CVSS 5.3) affecting chromium embedded framework. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CEF (Chromium Embedded Framework ) is a simple framework for embedding Chromium-based browsers in other applications. `CefLayeredWindowUpdaterOSR::OnAllocatedSharedMemory` does not check the size of the shared memory, which leads to out-of-bounds read outside the sandbox. This vulnerability was patched in commit 1f55d2e.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-125
Published	2024-01-12
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: chromiumembedded

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-01-12 22:15 UTCPublished CVE record published
2026-06-17 07:09 UTCUpdated Record last modified

chromiumembedded chromium embedded framework UPGRADE

Affected: < 2024-01-05

Fixed in: 2024-01-05

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy chromium-embedded-framework || rpm -q chromium-embedded-framework || chromium-embedded-framework --version

2. UPGRADE to 2024-01-05 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade chromium-embedded-framework

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade chromium-embedded-framework

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-21639?

chromium embedded framework: upgrade to 2024-01-05. Exact commands for each OS are on this page.

Is CVE-2024-21639 being exploited?

CVE-2024-21639 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-21639 affect?

CVE-2024-21639 affects chromium embedded framework. Severity is medium (CVSS 5.3). CEF (Chromium Embedded Framework ) is a simple framework for embedding Chromium-based browsers in other applications. `CefLayeredWindowUpdaterOSR::OnAllocatedSharedMemory` does not check the size of the shared memory, which leads to out-of-

How urgent is CVE-2024-21639?

Priority 37/100. Public exploit reference

Software pages

Chromium vulnerabilities

Related CVEs

CVE-2024-21640 MEDIUM 5.4 UPGRADE Chromium Embedded Framework (CEF) is a simple framework for embedding Chromium-based browsers in other applica

References

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