# Google Chromium libvpx: Heap Buffer Overflow (CVE-2023-5217) · pwn.watch

> 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. Added to CISA KEV on 2023-10-02.

Page: https://pwn.watch/i/google-chromium-libvpx-cve-2023-5217 · generated 2026-10-23T03:54:42.456Z

## Status
- Severity: high · status: closed · patch: patched
- Product: Google Chromium libvpx
- Started: 2023-10-02 · closed: 2023-10-02
- CVEs: CVE-2023-5217
- Affected: See vendor advisory / CISA notes (versions not always listed in KEV feed)
- Fixed in: See vendor advisory linked in sources

## Follow this incident
- RSS (one item per update): https://pwn.watch/i/google-chromium-libvpx-cve-2023-5217/feed.xml
- JSON Feed: https://pwn.watch/i/google-chromium-libvpx-cve-2023-5217/feed.json
- Full data (timeline, sources, posts, agentBrief): https://pwn.watch/i/google-chromium-libvpx-cve-2023-5217.json
- This file: https://pwn.watch/i/google-chromium-libvpx-cve-2023-5217/llms.txt

## Updates (newest first)
- 2023-10-02: CISA added CVE-2023-5217 to the KEV catalog (due 2023-10-23).

## Fix brief
# Security brief: Google Chromium libvpx: Heap Buffer Overflow (CVE-2023-5217)

Source: https://pwn.watch/i/google-chromium-libvpx-cve-2023-5217 · status: closed (closed Oct 2, 2023) · severity: high · updated Oct 2, 2023

## Patch status
**PATCHED: fixed releases exist. Upgrade to a fixed version.**

## What it is
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. Added to CISA KEV on 2023-10-02.

Severity detail: CVSS 8.8 (NVD), actively exploited (CISA KEV)

- Product: Google Chromium libvpx
- CVE / advisory ids: CVE-2023-5217

## Affected versions
- See vendor advisory / CISA notes (versions not always listed in KEV feed)

## Check whether you're affected
No generic command applies (the product is a hosted service, appliance or desktop app). Check the installed version in its admin UI / About screen and compare with the versions above.

## Fix
Upgrade to one of these fixed versions (or later on the same branch):
- See vendor advisory linked in sources

After upgrading, re-run the checks above and redeploy/restart the affected services.

## Latest updates
- Oct 2, 2023: CISA added CVE-2023-5217 to the KEV catalog (due 2023-10-23).

## Advisories
- [Vendor advisory: Google Chromium libvpx](https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_27.html) (Google)
- [NVD: CVE-2023-5217](https://nvd.nist.gov/vuln/detail/CVE-2023-5217) (NVD)
- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) (CISA)

## Caveats
Derived from CISA KEV JSON feed catalogVersion 2026.10.21. Exact affected/fixed version strings are not always in the KEV record — verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier).

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Machine-readable: https://pwn.watch/i/google-chromium-libvpx-cve-2023-5217.json · all incidents: https://pwn.watch/incidents.json. Verify against the vendor advisory before changing production systems.