CISA KEV · Known exploitedHigh

CVE-2023-4863

Google Chromium WebP

Heap buffer overflow in libwebp in Google Chrome prior to 116.0.5845.187 and libwebp 1.3.2 allowed a remote attacker to perform an out of bounds memory write via a crafted HTML page. (Chromium security severity: Critical)

CVSS: 8.8
EPSS: 99.7%
CISA KEV: Listed
Published: 2023.09.13

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability99.7%

Technical severityCVSS 8.8

Vulnerability overview

Affected product and versions

Product: Google Chromium WebP
Affected versions: 116.0.5845.187, 1.3.2, < 116.0.5845.187, 37, 38, 39, 10.0, 11.0, 12.0, < 102.15.1, < 117.0.1, >= 115.1.0 < 115.2.1, >= 115.0 < 115.2.2, < 116.0.1938.81, < 1.6.00.26463, < 1.6.00.26474, < 1.0.62681.0, < 1.3.2, < 2023.2, < 5.51
Fixed versions: 116.0.5845.187, 102.15.1, 117.0.1, 115.2.1, 115.2.2, 116.0.1938.81, 1.6.00.26463, 1.6.00.26474, 1.0.62681.0, 1.3.2, 2023.2, 5.51

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Due date: 2023.10.04

1
Identify
Confirm that Google Chromium WebP and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE: CWE-787
KEV added: 2023.09.13
Ransomware use: 미확인