IRONSMITHINTEL
HIGHCVSS8.8
|
Actively Exploited
|CISA KEV|CVE-2023-5217|Auth: none — unauthenticated|Reboot: required|Manual only

Google Chromium libvpx Heap Buffer Overflow Vulnerability (CVE-2023-5217)

Google Chromium libvpx contains a heap buffer overflow vulnerability in vp8 encoding that allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. This vulnerability could impact web browsers using libvpx, including but not limited to Google Chrome.

Published Sep 28, 2023 · Updated May 29, 2026
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Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve full data confidentiality loss, arbitrary modification of data, complete denial of service or system unavailability. Federal agencies are required to remediate by 2023-10-23 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Out-of-bounds Write (CWE-787) vulnerability in Google Chromium libvpx. Heap buffer overflow in vp8 encoding in libvpx in Google Chrome prior to 117.0.5938.132 and libvpx 1.13.1 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High) Exploitation requires remote network access, low attack complexity, no authentication required, and user interaction required.

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Phishing link

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Malicious file

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Server compromised

Am I affected?Quick check

Probably yes if any of these apply:

IT Security
Running libvpx: v < 1.13.1; edge: 116.0.1938.98, 117.0.2045.47; edge chromium: 116.0.5845.229, 117.0.5938.132; firefox: v < 115.3.1, v < 118.0.1, v < 118.1; thunderbird: v < 115.3.1; fedora: 37, 38, 39; debian linux: 10.0, 11.0, 12.0; ipados: 17.0 ≤ v < 17.0.3, 16.7; iphone os: 17.0 ≤ v < 17.0.3, 16.7; chrome: v < 117.0.5938.132; enterprise linux: 9.0
Real-world incidentsWhat we've seen

Active exploitation documented in the wild. Threat-research write-up: https://crbug.com/1486441

How to patch

Get the fix

Apply the fixed package from your vendor. The advisory lists affected versions and the exact fixed build.

Vendor advisory

Manual remediation steps

Apply the Vendor Patch

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog — apply the vendor's security update as soon as possible.

CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

References

    1
    Vendor advisory: https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_27.html
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2023-5217
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-5217
PowerShell automationComing soon

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