CVE-2023-5217

CVE-2023-5217 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 2023-10-02). The underlying weakness is classified as CWE-787.

Key facts

• Severity: High (CVSS 3.x base score 8.8)
• EPSS exploit prediction: 49% (99th percentile)
• Actively exploited: Yes — listed in CISA KEV (added 2023-10-02)
• EU (EUVD) id: EUVD-2023-2578
• EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2023-10-02)
• Weakness: CWE-787
• Affected product: Google Chrome
• Published: 2023-09-28
• Last modified: 2026-06-17

Description

Heap buffer overflow in vp8 encoding in libvpx in Google Chrome prior to 117.0.5938.132 and libvpx 1.13.1 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)

Frequently asked questions

What is CVE-2023-5217?

Heap buffer overflow in vp8 encoding in libvpx in Google Chrome prior to 117.0.5938.132 and libvpx 1.13.1 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)

How severe is CVE-2023-5217?

CVE-2023-5217 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-2023-5217 being actively exploited?

Yes. CVE-2023-5217 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-10-02, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2023-5217?

CVE-2023-5217 primarily affects Google Chrome. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-5217?

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-2023-5217 have an EU (EUVD) identifier?

Yes. CVE-2023-5217 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-2578. It is also flagged as exploited in the EUVD (since 2023-10-02).

When was CVE-2023-5217 published?

CVE-2023-5217 was published on 2023-09-28 and last updated on 2026-06-17.

References

• http://seclists.org/fulldisclosure/2023/Oct/12
• http://seclists.org/fulldisclosure/2023/Oct/16
• http://www.openwall.com/lists/oss-security/2023/09/28/5
• http://www.openwall.com/lists/oss-security/2023/09/28/6
• http://www.openwall.com/lists/oss-security/2023/09/29/1
• http://www.openwall.com/lists/oss-security/2023/09/29/11
• http://www.openwall.com/lists/oss-security/2023/09/29/12
• http://www.openwall.com/lists/oss-security/2023/09/29/14
• http://www.openwall.com/lists/oss-security/2023/09/29/2
• http://www.openwall.com/lists/oss-security/2023/09/29/7
• http://www.openwall.com/lists/oss-security/2023/09/29/9
• http://www.openwall.com/lists/oss-security/2023/09/30/1
• http://www.openwall.com/lists/oss-security/2023/09/30/2
• http://www.openwall.com/lists/oss-security/2023/09/30/3
• http://www.openwall.com/lists/oss-security/2023/09/30/4
• http://www.openwall.com/lists/oss-security/2023/09/30/5
• http://www.openwall.com/lists/oss-security/2023/10/01/1
• http://www.openwall.com/lists/oss-security/2023/10/01/2
• http://www.openwall.com/lists/oss-security/2023/10/01/5
• http://www.openwall.com/lists/oss-security/2023/10/02/6
• http://www.openwall.com/lists/oss-security/2023/10/03/11
• https://arstechnica.com/security/2023/09/new-0-day-in-chrome-and-firefox-is-likely-to-plague-other-software/
• https://bugzilla.redhat.com/show_bug.cgi?id=2241191
• https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_27.html
• https://crbug.com/1486441
• https://github.com/webmproject/libvpx/commit/3fbd1dca6a4d2dad332a2110d646e4ffef36d590
• https://github.com/webmproject/libvpx/commit/af6dedd715f4307669366944cca6e0417b290282
• https://github.com/webmproject/libvpx/releases/tag/v1.13.1
• https://github.com/webmproject/libvpx/tags
• https://lists.debian.org/debian-lts-announce/2023/09/msg00038.html

Affected products (21)

• cpe:2.3:a:webmproject:libvpx:*:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:edge:116.0.1938.98:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:edge:117.0.2045.47:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:edge_chromium:116.0.5845.229:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:edge_chromium:117.0.5938.132:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
• cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
• cpe:2.3:a:mozilla:firefox:*:*:*:*:*:android:*:*
• cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
• 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:o:apple:ipados:*:*:*:*:*:*:*:*
• cpe:2.3:o:apple:ipados:16.7:*:*:*:*:*:*:*
• cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
• cpe:2.3:o:apple:iphone_os:16.7:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

More vulnerabilities in Google Chrome

• CVE-2026-13782 — Critical (CVSS 10.0): Use after free in Browser in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
• CVE-2015-8548 — Critical (CVSS 10.0): Multiple unspecified vulnerabilities in Google V8 before 4.7.80.23, as used in Google Chrome before 47.0.2526.80, allow…
• CVE-2015-6791 — Critical (CVSS 10.0): Multiple unspecified vulnerabilities in Google Chrome before 47.0.2526.80 allow attackers to cause a denial of service…
• CVE-2015-6788 — Critical (CVSS 10.0): The ObjectBackedNativeHandler class in extensions/renderer/object_backed_native_handler.cc in the extensions subsystem…
• CVE-2015-8480 — Critical (CVSS 10.0): The VideoFramePool::PoolImpl::CreateFrame function in media/base/video_frame_pool.cc in Google Chrome before…
• CVE-2015-6787 — Critical (CVSS 10.0): Multiple unspecified vulnerabilities in Google Chrome before 47.0.2526.73 allow attackers to cause a denial of service…

All CVEs affecting Google Chrome →

Other CWE-787 (Out-of-bounds Write) vulnerabilities

• CVE-2026-42369 — Critical (CVSS 10.0): GV-VMS V20 is a Video Monitoring Software used to gather the feeds of many surveillance cameras and manage other…
• CVE-2026-4746 — Critical (CVSS 10.0): Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is…
• CVE-2025-43300 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS…
• CVE-2025-24201 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in…
• CVE-2024-42479 — Critical (CVSS 10.0): llama.cpp provides LLM inference in C/C++. The unsafe `data` pointer member in the `rpc_tensor` structure can cause…
• CVE-2024-39791 — Critical (CVSS 10.0): Stack-based buffer overflow vulnerabilities affecting Vonets industrial wifi bridge relays and wifi bridge…

Browse all CWE-787 (Out-of-bounds Write) vulnerabilities →