CVE-2023-4863

CVE-2023-4863 is a high-severity vulnerability in Google Chrome with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2023-09-13). The underlying weakness is classified as CWE-787.

Key facts

• Severity: High (CVSS 3.x base score 8.8)
• EPSS exploit prediction: 100% (100th percentile)
• Actively exploited: Yes — listed in CISA KEV (added 2023-09-13)
• EU (EUVD) id: EUVD-2023-2533
• EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2023-09-13)
• Weakness: CWE-787
• Affected product: Google Chrome
• Published: 2023-09-12
• Last modified: 2026-06-17

Description

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)

Frequently asked questions

What is CVE-2023-4863?

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)

How severe is CVE-2023-4863?

CVE-2023-4863 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-4863 being actively exploited?

Yes. CVE-2023-4863 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-09-13, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2023-4863?

CVE-2023-4863 primarily affects Google Chrome. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-4863?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2023-4863 have an EU (EUVD) identifier?

Yes. CVE-2023-4863 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-2533. It is also flagged as exploited in the EUVD (since 2023-09-13).

When was CVE-2023-4863 published?

CVE-2023-4863 was published on 2023-09-12 and last updated on 2026-06-17.

References

• http://www.openwall.com/lists/oss-security/2023/09/21/4
• http://www.openwall.com/lists/oss-security/2023/09/22/1
• http://www.openwall.com/lists/oss-security/2023/09/22/3
• http://www.openwall.com/lists/oss-security/2023/09/22/4
• http://www.openwall.com/lists/oss-security/2023/09/22/5
• http://www.openwall.com/lists/oss-security/2023/09/22/6
• http://www.openwall.com/lists/oss-security/2023/09/22/7
• http://www.openwall.com/lists/oss-security/2023/09/22/8
• http://www.openwall.com/lists/oss-security/2023/09/26/1
• http://www.openwall.com/lists/oss-security/2023/09/26/7
• http://www.openwall.com/lists/oss-security/2023/09/28/1
• http://www.openwall.com/lists/oss-security/2023/09/28/2
• http://www.openwall.com/lists/oss-security/2023/09/28/4
• https://adamcaudill.com/2023/09/14/whose-cve-is-it-anyway/
• https://blog.isosceles.com/the-webp-0day/
• https://bugzilla.suse.com/show_bug.cgi?id=1215231
• https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html
• https://crbug.com/1479274
• https://en.bandisoft.com/honeyview/history/
• https://github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17a
• https://github.com/webmproject/libwebp/releases/tag/v1.3.2
• https://lists.debian.org/debian-lts-announce/2023/09/msg00015.html
• https://lists.debian.org/debian-lts-announce/2023/09/msg00016.html
• https://lists.debian.org/debian-lts-announce/2023/09/msg00017.html
• https://lists.fedoraproject.org/archives/list/[email protected]/message/6T655QF7CQ3DYAMPFV7IECQYGDEUIVVT/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/FYYKLG6CRGEDTNRBSU26EEWAO6D6U645/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/KUQ7CTX3W372X3UY56VVNAHCH6H2F4X3/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/OZDGWWMJREPAGKWCJKSCM4WYLANSKIFX/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/PYZV7TMKF4QHZ54SFJX54BDN52VHGGCX/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/WHOLML7N2G5KCAZXFWC5IDFFHSQS5SDB/

Affected products (18)

• cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
• cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
• cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:teams:*:*:*:*:*:macos:*:*
• cpe:2.3:a:microsoft:teams:*:*:*:*:desktop:*:*:*
• cpe:2.3:a:microsoft:webp_image_extension:*:*:*:*:*:*:*:*
• cpe:2.3:a:webmproject:libwebp:*:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
• cpe:2.3:a:bentley:seequent_leapfrog:*:*:*:*:*:*:*:*
• cpe:2.3:a:bandisoft:honeyview:*:*:*:*:*:*:*:*

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