Skip to content

CVE-2023-5217 — Heap buffer overflow in vp8 encoding in libvpx in Google Chrome prior to 117.0.5938.132…

Key facts

CVE-2023-5217 is a High (8.8) vulnerability: Heap buffer overflow in vp8 encoding in libvpx in Google Chrome prior to 117.0.5938.132…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2023-10-02), confirming active exploitation in the wild.

Actively exploited — on the CISA KEV catalog

CVE-2023-5217 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2023-10-02), confirming exploitation in the wild. Federal remediation deadline: 2023-10-23. Prioritise patching and deploy the detection and prevention rules below.
CVE CVE-2023-5217
Severity High (8.8)
CISA KEV Actively exploited (added 2023-10-02)
Detection / prevention —
PoC poc.py
Source 2023/CVE-2023-5217/

Details

English | 한국어

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)

Vulnerability Details

Property Value
CVE ID CVE-2023-5217
Type RCE
CVSS Score 8.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2023/CVE-2023-5217/poc.py

Usage

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start

# Clone and navigate to CVE directory
cd CVE-2023-5217

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints

Application URL Status
Vulnerable App http://localhost:8080 Shows vulnerability
Patched App http://localhost:8081 Demonstrates fix

Directory Structure

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

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
  • https://lists.debian.org/debian-lts-announce/2023/10/msg00001.html
  • https://lists.debian.org/debian-lts-announce/2023/10/msg00015.html
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4MFWDFJSSIFKWKNOCTQCFUNZWAXUCSS4/
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/55YVCZNAVY3Y5E4DWPWMX2SPKZ2E5SOV/
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AY642Z6JZODQJE7Z62CFREVUHEGCXGPD/
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BCVSHVX2RFBU3RMCUFSATVQEJUFD4Q63/
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CWEJYS5NC7KVFYU3OAMPKQDYN6JQGVK6/
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TE7F54W5O5RS4ZMAAC7YK3CZWQXIDSKB/
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WTRUIS3564P7ZLM2S2IH4Y4KZ327LI4I/
  • https://pastebin.com/TdkC4pDv
  • https://security-tracker.debian.org/tracker/CVE-2023-5217
  • https://security.gentoo.org/glsa/202310-04
  • https://security.gentoo.org/glsa/202401-34
  • https://stackdiary.com/google-discloses-a-webm-vp8-bug-tracked-as-cve-2023-5217/
  • https://support.apple.com/kb/HT213961
  • https://support.apple.com/kb/HT213972
  • https://twitter.com/maddiestone/status/1707163313711497266
  • https://www.debian.org/security/2023/dsa-5508
  • https://www.debian.org/security/2023/dsa-5509
  • https://www.debian.org/security/2023/dsa-5510
  • https://www.mozilla.org/en-US/security/advisories/mfsa2023-44/
  • https://www.openwall.com/lists/oss-security/2023/09/28/5
  • 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
  • https://lists.debian.org/debian-lts-announce/2023/10/msg00001.html
  • https://lists.debian.org/debian-lts-announce/2023/10/msg00015.html
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4MFWDFJSSIFKWKNOCTQCFUNZWAXUCSS4/
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/55YVCZNAVY3Y5E4DWPWMX2SPKZ2E5SOV/
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AY642Z6JZODQJE7Z62CFREVUHEGCXGPD/
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BCVSHVX2RFBU3RMCUFSATVQEJUFD4Q63/
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CWEJYS5NC7KVFYU3OAMPKQDYN6JQGVK6/
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TE7F54W5O5RS4ZMAAC7YK3CZWQXIDSKB/
  • https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WTRUIS3564P7ZLM2S2IH4Y4KZ327LI4I/
  • https://pastebin.com/TdkC4pDv
  • https://security-tracker.debian.org/tracker/CVE-2023-5217
  • https://security.gentoo.org/glsa/202310-04
  • https://security.gentoo.org/glsa/202401-34
  • https://stackdiary.com/google-discloses-a-webm-vp8-bug-tracked-as-cve-2023-5217/
  • https://support.apple.com/kb/HT213961
  • https://support.apple.com/kb/HT213972
  • https://twitter.com/maddiestone/status/1707163313711497266
  • https://www.debian.org/security/2023/dsa-5508
  • https://www.debian.org/security/2023/dsa-5509
  • https://www.debian.org/security/2023/dsa-5510
  • https://www.mozilla.org/en-US/security/advisories/mfsa2023-44/
  • https://www.openwall.com/lists/oss-security/2023/09/28/5
  • https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-5217

Generated by PoC Generator on 2026-07-09T06:08:55.075997356

Frequently asked questions

What is CVE-2023-5217?

CVE-2023-5217 is a High (8.8) vulnerability: Heap buffer overflow in vp8 encoding in libvpx in Google Chrome prior to 117.0.5938.132…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2023-10-02), confirming active exploitation in the wild.

How do I detect CVE-2023-5217?

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2023-5217?

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

Is CVE-2023-5217 actively exploited?

Yes. CVE-2023-5217 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2023-10-02, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2023-10-23. Prioritise patching and deploy the detection and prevention rules above.

For authorized security testing and research only. See the full source and NVD record.