What is CVE-2023-4863?

CVE-2023-4863 is a high-severity vulnerability in Bandisoft Honeyview, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2023-09-12.

How severe is CVE-2023-4863?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2023-4863 known to be exploited?

Yes. CVE-2023-4863 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-09-13), indicating it is being actively exploited. 65 public proof-of-concept repositories are indexed.

Buffer overflow in Bandisoft Honeyview

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)

Vulnerability class: Buffer Overflow

Published 2023-09-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 1.000 (100.0th percentile), scored 2026-10-17.

Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 100.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2023-09-13. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2023-10-04.

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

Public proof-of-concept exploits

References

chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html (Vendor Advisory)
crbug.com/1479274 (Issue Tracking, Vendor Advisory)
en.bandisoft.com/honeyview/history/ (Release Notes)
stackdiary.com/critical-vulnerability-in-webp-codec-cve-2023-4863/ (Exploit, Third Party Advisory)
www.mozilla.org/en-US/security/advisories/mfsa2023-40/ (Third Party Advisory)
github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17a (Patch)
msrc.microsoft.com/update-guide/vulnerability/CVE-2023-4863 (Patch, Third Party Advisory)
security-tracker.debian.org/tracker/CVE-2023-4863 (Third Party Advisory, Issue Tracking)
bugzilla.suse.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
news.ycombinator.com/item (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2023-4863?: CVE-2023-4863 is a high-severity vulnerability in Bandisoft Honeyview, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2023-09-12.
How severe is CVE-2023-4863?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2023-4863 known to be exploited?: Yes. CVE-2023-4863 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-09-13), indicating it is being actively exploited. 65 public proof-of-concept repositories are indexed.