CVE-2023-4863

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2023-09-13. Federal remediation due 2023-10-04.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

99.98% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 100.0% of scored records. A rank, not a probability.

NVD base score

8.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2023-09-12 14:24Z2 YR AGO

Last updated

2025-10-21 23:05Z10 MO AGO

Reserved

2023-09-09

Assigning CNA

Chrome

Record state

PUBLISHED

Severity

High (CVSS 8.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weaknesses

• CWE-787Out-of-bounds WriteBase
• CWE-122Heap-based Buffer OverflowVariant

Data version

5.1

Document digest

4067a3a15cee9332fef9830903f641fa098b1a23dc1e9e968b1be7e5df2ec11b

• chromereleases.googleblog.comhttps://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html
• crbug.comhttps://crbug.com/1479274
• en.bandisoft.comhttps://en.bandisoft.com/honeyview/history/
• stackdiary.comhttps://stackdiary.com/critical-vulnerability-in-webp-codec-cve-2023-4863/
• www.mozilla.orghttps://www.mozilla.org/en-US/security/advisories/mfsa2023-40/
• github.comhttps://github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17a
• msrc.microsoft.comhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-4863
• security-tracker.debian.orghttps://security-tracker.debian.org/tracker/CVE-2023-4863
• bugzilla.suse.comhttps://bugzilla.suse.com/show_bug.cgi?id=1215231
• news.ycombinator.comhttps://news.ycombinator.com/item?id=37478403
• www.bleepingcomputer.comhttps://www.bleepingcomputer.com/news/google/google-fixes-another-chrome-zero-day-bug-exploited-in-attacks/
• www.debian.orghttps://www.debian.org/security/2023/dsa-5496
• www.debian.orghttps://www.debian.org/security/2023/dsa-5497
• lists.fedoraproject.orghttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OZDGWWMJREPAGKWCJKSCM4WYLANSKIFX/
• lists.fedoraproject.orghttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FYYKLG6CRGEDTNRBSU26EEWAO6D6U645/
• lists.fedoraproject.orghttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PYZV7TMKF4QHZ54SFJX54BDN52VHGGCX/
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2023/09/msg00015.html
• lists.fedoraproject.orghttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WHOLML7N2G5KCAZXFWC5IDFFHSQS5SDB/
• www.debian.orghttps://www.debian.org/security/2023/dsa-5498
• security.gentoo.orghttps://security.gentoo.org/glsa/202309-05
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2023/09/msg00016.html
• lists.fedoraproject.orghttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6T655QF7CQ3DYAMPFV7IECQYGDEUIVVT/
• adamcaudill.comhttps://adamcaudill.com/2023/09/14/whose-cve-is-it-anyway/
• github.comhttps://github.com/webmproject/libwebp/releases/tag/v1.3.2
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2023/09/msg00017.html
• lists.fedoraproject.orghttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KUQ7CTX3W372X3UY56VVNAHCH6H2F4X3/
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2023/09/21/4
• blog.isosceles.comhttps://blog.isosceles.com/the-webp-0day/
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2023/09/22/1
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2023/09/22/3
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2023/09/22/4
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2023/09/22/5
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2023/09/22/8
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2023/09/22/7
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2023/09/22/6
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2023/09/26/1
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2023/09/26/7
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2023/09/28/1
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2023/09/28/2
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2023/09/28/4
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20230929-0011/
• lists.fedoraproject.orghttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WTRUIS3564P7ZLM2S2IH4Y4KZ327LI4I/
• sethmlarson.devhttps://sethmlarson.dev/security-developer-in-residence-weekly-report-16
• www.bentley.comhttps://www.bentley.com/advisories/be-2023-0001/
• security.gentoo.orghttps://security.gentoo.org/glsa/202401-10
• www.vicarius.iohttps://www.vicarius.io/vsociety/posts/zero-day-webp-vulnerability-cve-2023-4863
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4863government-resource