CVE-2023-5217

Google Chromium libvpx Heap Buffer Overflow Vulnerability

High 8.8
Exploited: added to CISA KEV 2 Oct 2023

Description

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)

Key facts

Published: 28 Sep 2023
Last changed: 21 Oct 2025
Assigned by: Chrome
KEV added: 2 Oct 2023
KEV fix due: 23 Oct 2023
EPSS: 49.013% likely to be exploited in the next 30 days, higher than 98.902% of CVEs (scores for 15 Nov 2026)
SSVC (CISA): Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

8.8CVSS 3.1, Highfrom CISA (ADP container)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

What to do

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

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Vendor	Product	Versions
Google	Chrome	117.0.5938.132 up to but excluding 117.0.5938.132 (affected)
Google	libvpx	1.13.1 up to but excluding 1.13.1 (affected)