Loading vulnerability…
CVE-2023-5217 is a heap buffer overflow in the VP8 encoding functionality of libvpx. A remote attacker can potentially trigger heap corruption through a crafted HTML page processed by an affected browser or embedded Chromium application. Google Chrome versions before 117.0.5938.132 are affected. Successful exploitation may permit arbitrary code execution. The vulnerability also affects applications incorporating vulnerable libvpx code, including Electron and CefSharp, and has been actively exploited.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a Proof-of-Concept (PoC) exploit for CVE-2023-5217, a heap buffer overflow vulnerability in the libvpx VP8 encoder, which is used by Chromium-based browsers (such as Google Chrome). The exploit demonstrates how a remote attacker can trigger a controlled heap overflow in the browser process by manipulating video encoding parameters via the WebCodecs and/or MediaRecorder APIs from JavaScript. The repository includes several HTML files (combined.html, mediarecorder.html, webcodecs.html) that serve as entry points for the exploit, a JavaScript worker (webcodecs.js) that performs the encoding logic, and scripts (server.py, gen_server_key.sh) to set up a local HTTPS server with a self-signed certificate. The exploit is effective against vulnerable versions of Chrome (e.g., 117.0.5938.131) and causes a browser tab crash, demonstrating the vulnerability but not achieving code execution. The README provides detailed technical background on the vulnerability, exploitation strategy, and testing instructions. No direct remote network endpoints are hardcoded, but the exploit is designed to be served locally over HTTPS (https://localhost:4443).
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A heap buffer overflow in libvpx VP8 encoding allows a remote attacker to potentially exploit heap corruption through a crafted HTML page. The advisory identifies affected Firefox ESR packages and recommends upgrading to 140.8.0esr-1~deb13u1 or later. It reports a CVSS v3 score of 8.8, available exploits, and inclusion in CISA's Known Exploited Vulnerabilities catalog.
A vulnerability in libvpx addressed by CIQ LTS 8.6 security advisory ciqsa-2026_0097. The affected Rocky Linux 8.6 host requires package updates.
A critical vulnerability affecting Unity Linux systems, rated CVSS v3 8.8 (network-accessible, low complexity, no privileges required, user interaction required) with high impacts to confidentiality, integrity, and availability.
A Mozilla product vulnerability that could allow attackers to execute malicious code on the affected system.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.