CISA KEV High
Memory corruption exploit reference
CVE-2023-4863 — Google Chromium WebP Heap-Based Buffer Overflow Vulnerability
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)
62
High
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Confirmed exploitation (CISA KEV)+35
- Public exploit/PoC (github)+6
- EPSS 100% (30-day exploitation probability)+15
- Technical severity (high)+6
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Exploitation
Confirmed
CISA KEV, listed Sep 13, 2023
EPSS FIRST
99.98%
ahead of 100% of scored CVEs · Oct 14, 2026
Affects
Bandisoft
Honeyview and 24 more
CVSS base
8.8
High · 4 source(s)
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Exploitation
Active
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — msrc.microsoft.com (NIST National Vulnerability Database)
- Npm Electron: fixed in version 22.3.24 — github.com (GitHub Security Advisories)
- Npm Electron: fixed in version 24.8.3 — github.com (GitHub Security Advisories)
- Npm Electron: fixed in version 25.8.1 — github.com (GitHub Security Advisories)
- Npm Electron: fixed in version 26.2.1 — github.com (GitHub Security Advisories)
- Npm Electron: fixed in version 27.0.0-beta.2 — github.com (GitHub Security Advisories)
- Rust Libwebp-sys2: fixed in version 0.1.8 — github.com (GitHub Security Advisories)
- Rust Libwebp-sys: fixed in version 0.9.3 — github.com (GitHub Security Advisories)
- Nuget SkiaSharp: fixed in version 2.88.6 — github.com (GitHub Security Advisories)
- Pip Pillow: fixed in version 10.0.1 — github.com (GitHub Security Advisories)
- Rust Webp: fixed in version 0.2.6 — github.com (GitHub Security Advisories)
- Nuget Magick.net-q16-anycpu: fixed in version 13.3.0 — github.com (GitHub Security Advisories)
- Nuget Magick.net-q16-hdri-anycpu: fixed in version 13.3.0 — github.com (GitHub Security Advisories)
- Nuget Magick.net-q16-x64: fixed in version 13.3.0 — github.com (GitHub Security Advisories)
- Nuget Magick.net-q8-anycpu: fixed in version 13.3.0 — github.com (GitHub Security Advisories)
- Nuget Magick.net-q8-openmp-x64: fixed in version 13.3.0 — github.com (GitHub Security Advisories)
- Nuget Magick.net-q8-x64: fixed in version 13.3.0 — github.com (GitHub Security Advisories)
- Go Github.com/chai2010/webp: fixed in version 0.0.0-20250406010349-76805d5a8860 — github.com (GitHub Security Advisories)
- Go Github.com/chai2010/webp: fixed in version 1.4.0 — github.com (GitHub Security Advisories)
- Go Github.com/chai2010/webp: fixed in version 1.1.2-0.20250406010349-76805d5a8860 — github.com (GitHub Security Advisories)
CISA required action CISA
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
US federal deadline: Oct 4, 2023 — passed 1107 day(s) ago
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Bandisoft Honeyview, Bentley Seequent Leapfrog, Debian Debian Linux…).
- Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
- The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
- Apply the fixed version or the patch documented under Remediation.
- Exploitation requires user interaction: tighten email/web filtering and warn affected users.
- EPSS ahead of 100% of scored CVEs: prioritize it in the patch queue.
- Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Bandisoft | Honeyview | < 5.51 | Vulnerable | NIST National Vulnerability Database |
| Bentley | Seequent Leapfrog | < 2023.2 | Vulnerable | NIST National Vulnerability Database |
| Debian | Debian Linux | version 10.0version 11.0version 12.0 | Vulnerable | NIST National Vulnerability Database |
| Fedoraproject | Fedora | version 38version 37version 39 | Vulnerable | NIST National Vulnerability Database |
| Chrome | ≥ 116.0.5845.187 and < 116.0.5845.187 | Vulnerable | CVE Program (cve.org) e CISA ADP | |
| Chrome | < 116.0.5845.187 | Vulnerable | NIST National Vulnerability Database | |
| Libwebp | ≥ 1.3.2 and < 1.3.2 | Vulnerable | CVE Program (cve.org) e CISA ADP | |
| Microsoft | Edge Chromium | < 116.0.1938.81 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Teams | < 1.6.00.26463< 1.6.00.26474 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Webp Image Extension | < 1.0.62681.0 | Vulnerable | NIST National Vulnerability Database |
| Mozilla | Firefox | ≥ 115.1.0 and < 115.2.1< 117.0.1< 102.15.1 | Vulnerable | NIST National Vulnerability Database |
| Mozilla | Thunderbird | ≥ 115.0 and < 115.2.2< 102.15.1 | Vulnerable | NIST National Vulnerability Database |
| Netapp | Active Iq Unified Manager | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Webmproject | Libwebp | < 1.3.2 | Vulnerable | NIST National Vulnerability Database |
| Go | Github.com/chai2010/webp | ≥ 0.0.0 and < 1.1.2-0.20250406010349-76805d5a8860≥ 1.1.2 and < 1.4.0< 0.0.0-20250406010349-76805d5a8860 | Vulnerable | GitHub Security Advisories |
| Npm | Electron | ≥ 26.0.0 and < 26.2.1≥ 27.0.0-beta.1 and < 27.0.0-beta.2≥ 25.0.0 and < 25.8.1≥ 24.0.0 and < 24.8.3≥ 22.0.0 and < 22.3.24 | Vulnerable | GitHub Security Advisories |
| Nuget | Magick.net-q16-anycpu | < 13.3.0 | Vulnerable | GitHub Security Advisories |
| Nuget | Magick.net-q16-hdri-anycpu | < 13.3.0 | Vulnerable | GitHub Security Advisories |
| Nuget | Magick.net-q16-x64 | < 13.3.0 | Vulnerable | GitHub Security Advisories |
| Nuget | Magick.net-q8-anycpu | < 13.3.0 | Vulnerable | GitHub Security Advisories |
| Nuget | Magick.net-q8-openmp-x64 | < 13.3.0 | Vulnerable | GitHub Security Advisories |
| Nuget | Magick.net-q8-x64 | < 13.3.0 | Vulnerable | GitHub Security Advisories |
| Nuget | SkiaSharp | ≥ 2.0.0 and < 2.88.6 | Vulnerable | GitHub Security Advisories |
| Pip | Pillow | < 10.0.1 | Vulnerable | GitHub Security Advisories |
| Rust | Libwebp-sys | < 0.9.3 | Vulnerable | GitHub Security Advisories |
| Rust | Libwebp-sys2 | < 0.1.8 | Vulnerable | GitHub Security Advisories |
| Rust | Webp | < 0.2.6 | Vulnerable | GitHub Security Advisories |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 8.8 | CVSS 3.1 | High | 2.8 | 5.9 | nvd@nist.gov via NIST National Vulnerability Database |
| 8.8 | CVSS 3.1 | High | 2.8 | 5.9 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database |
| 8.8 | CVSS 3.1 | High | — | — | GitHub, Inc. via GitHub Security Advisories |
| 8.8 | CVSS 3.1 | High | — | — | CISA-ADP via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
CISA KEV details CISA
CISA lists a CVE once it has evidence of exploitation against real targets.
Listed
Sep 13, 2023
Federal deadline
Oct 4, 2023
passed 1107 day(s) ago
Ransomware use
Unknown
CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.
Public exploits, PoCs and detection templates
Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.
Proofs of concept on GitHub — 14 repositories; showing the 10 most starred
- mistymntncop/CVE-2023-4863 ★ 319 Sep 21, 2023
- LiveOverflow/webp-CVE-2023-4863 ★ 56 Dec 18, 2023
- This tool calculates tricky canonical huffman histogram for CVE-2023-4863. ★ 25 Dec 19, 2023
- A tool for finding vulnerable libwebp(CVE-2023-4863) ★ 21 Oct 5, 2023
- bbaranoff/CVE-2023-4863 ★ 6 Sep 25, 2023
- Find Electron Apps Vulnerable to CVE-2023-4863 / CVE-2023-5129 ★ 6 Sep 30, 2023
- Scans an executable and determines if it was wrapped in an Electron version vulnerable to the Chromium vulnerability CVE-2023-4863/ CVE-2023-5129 ★ 5 Sep 29, 2023
- huiwen-yayaya/CVE-2023-4863 ★ 4 Nov 11, 2023
- BAD-WEBP-CVE-2023-4863 ★ 3 Sep 25, 2023
- Shcesama/cve-2023-4863-analysis ★ 2 Jun 3, 2026
Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.
EPSS over time FIRST
Oct 12, 2026 → Oct 14, 2026 · 3 reading(s) · max 99.98%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
- Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
- Hunt retroactively in logs from before Sep 13, 2023 (KEV listing): exploitation may have started earlier.
Timeline
What happened to this CVE, newest first.
- 2026
- Fix documented
- Affected products added · rust/libwebp-sys2, rust/libwebp-sys, npm/electron, nuget/skiasharp, pip/pillow, rust/webp, nuget/magick.net-q16-anycpu,
- Affected products added · google/chrome, google/libwebp
- SSVC assessment updated
- Record published
- Fix documented
- Affected products added · google/chrome, fedoraproject/fedora, debian/debian linux, mozilla/firefox, mozilla/thunderbird, microsoft/edge chromium,
- CVSS changed · 8.8
- Source status changed · → Analyzed
- Added to CISA KEV (detected)
- Record created in this database
- 2023
- Added to CISA KEV catalog
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 2× References added · Oct 13, 2026 – Oct 13, 2026
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
79 on the record
- crbug.com/1479274
- chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html
- github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17a
- msrc.microsoft.com/update-guide/vulnerability/CVE-2023-4863
- www.cisa.gov/known-exploited-vulnerabilities-catalog
- security.gentoo.org/glsa/202401-10
- www.bentley.com/advisories/be-2023-0001
- www.bleepingcomputer.com/news/google/google-fixes-another-chrome-zero-day-bug-exploited-in-att
- nvd.nist.gov/vuln/detail/CVE-2023-4863
- www.debian.org/security/2023/dsa-5496
- github.com/jaredforth/webp/pull/30
- github.com/electron/electron/pull/39825
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PYZV7T
- github.com/ImageMagick/ImageMagick/discussions/6664
- www.openwall.com/lists/oss-security/2023/09/26/7
- github.com/electron/electron/pull/39826
- www.vicarius.io/vsociety/posts/zero-day-webp-vulnerability-cve-2023-4863
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PYZV7T
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FYYKLG
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WTRUIS
- www.openwall.com/lists/oss-security/2023/09/22/5
- www.mozilla.org/en-US/security/advisories/mfsa2023-40
- en.bandisoft.com/honeyview/history
- security.netapp.com/advisory/ntap-20230929-0011
- news.ycombinator.com/item
- github.com/python-pillow/Pillow/pull/7395
- stackdiary.com/critical-vulnerability-in-webp-codec-cve-2023-4863
- github.com/qnighy/libwebp-sys2-rs/pull/21
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KUQ7CT
- www.bleepingcomputer.com/news/google/google-fixes-another-chrome-zero-day-bug-exploited-in-att
- github.com/advisories/GHSA-j7hp-h8jx-5ppr
- www.debian.org/security/2023/dsa-5498
- sethmlarson.dev/security-developer-in-residence-weekly-report-16
- www.openwall.com/lists/oss-security/2023/09/22/6
- blog.isosceles.com/the-webp-0day/
- github.com/dlemstra/Magick.NET/releases/tag/13.3.0
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WHOLML
- github.com/jaredforth/webp/commit/9d4c56e63abecc777df71c702503c3eaabd7dcbc
- www.bentley.com/advisories/be-2023-0001/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OZDGWW
- www.debian.org/security/2023/dsa-5497
- adamcaudill.com/2023/09/14/whose-cve-is-it-anyway
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FYYKLG
- www.openwall.com/lists/oss-security/2023/09/22/8
- en.bandisoft.com/honeyview/history/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6T655Q
- pillow.readthedocs.io/en/stable/releasenotes/10.0.1.html
- rustsec.org/advisories/RUSTSEC-2023-0061.html
- github.com/electron/electron/pull/39827
- www.openwall.com/lists/oss-security/2023/09/22/4
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WHOLML
- www.openwall.com/lists/oss-security/2023/09/28/4
- www.openwall.com/lists/oss-security/2023/09/26/1
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OZDGWW
- lists.debian.org/debian-lts-announce/2023/09/msg00017.html
- bugzilla.suse.com/show_bug.cgi
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KUQ7CT
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WTRUIS
- security.gentoo.org/glsa/202309-05
- github.com/electron/electron/pull/39828
- www.openwall.com/lists/oss-security/2023/09/28/2
- github.com/electron/electron/pull/39823
- stackdiary.com/critical-vulnerability-in-webp-codec-cve-2023-4863/
- lists.debian.org/debian-lts-announce/2023/09/msg00015.html
- www.openwall.com/lists/oss-security/2023/09/22/3
- security.netapp.com/advisory/ntap-20230929-0011/
- www.openwall.com/lists/oss-security/2023/09/22/1
- github.com/webmproject/libwebp/releases/tag/v1.3.2
- github.com/qnighy/libwebp-sys2-rs/commit/4560c473a76ec8bd8c650f19ddf9d7a44f719f8
- www.mozilla.org/en-US/security/advisories/mfsa2023-40/
- blog.isosceles.com/the-webp-0day
- adamcaudill.com/2023/09/14/whose-cve-is-it-anyway/
- www.openwall.com/lists/oss-security/2023/09/28/1
- www.openwall.com/lists/oss-security/2023/09/22/7
- rustsec.org/advisories/RUSTSEC-2023-0060.html
- www.openwall.com/lists/oss-security/2023/09/21/4
- security-tracker.debian.org/tracker/CVE-2023-4863
- lists.debian.org/debian-lts-announce/2023/09/msg00016.html
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6T655Q
Elsewhere on this site
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Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2023-4863 is "Google Chromium WebP Heap-Based Buffer Overflow Vulnerability", rated High. It affects Honeyview (Bandisoft); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 8.8 describes technical severity. EPSS 99.98% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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