CVE-2022-2294: WebRTC Heap Buffer Overflow Vulnerability

CVE-2022-2294 is a heap buffer overflow in WebRTC, the open-source real-time communication stack used by many web browsers. An attacker who can trigger the flaw may achieve shellcode execution in the browser process. Because WebRTC is widely embedded, the issue matters for any organization that relies on browser-based voice, video, or peer connections. Public detail is limited beyond the CISA summary; confirm exact impact and fixed builds against vendor advisories.

CISA notes known ransomware use associated with this vulnerability and directs defenders to apply updates per vendor instructions. Treat exploitation risk as elevated until patched browsers are confirmed across the estate.

How it works

The weakness is classified as CWE-122 (heap-based buffer overflow). In this class of flaw, code writes past the bounds of a heap-allocated buffer. When that occurs inside WebRTC processing, an attacker who supplies crafted input can corrupt adjacent heap memory. Successful corruption can be leveraged to run attacker-controlled shellcode in the context of the affected browser or WebRTC component.

The CISA summary states the vulnerability allows shellcode execution and impacts web browsers that incorporate WebRTC, including but not limited to Google Chrome. Exact trigger conditions, input channels, and exploit mechanics are not provided in the given facts; defenders should assume that content or signaling that reaches the WebRTC stack could be relevant and must validate details against the vendor advisory for each browser or product.

Am I affected? How to find it in your systems

WebRTC typically runs inside desktop and mobile web browsers, embedded browser engines, and some collaboration or conferencing clients that ship their own WebRTC build. Inventory every browser and WebRTC-enabled application used by users and servers in your environment.

• Enumerate installed browser versions (Chrome and other Chromium-based browsers, plus any other products that declare WebRTC support) via software inventory, endpoint management, or package databases.
• Identify non-browser applications that bundle WebRTC (meeting clients, kiosk browsers, custom Electron or CEF apps) and record their versions and update channels.
• Compare collected versions against the fixed releases listed in each vendor’s advisory for CVE-2022-2294; do not assume a version is safe without that confirmation.
• Review browser and EDR telemetry for unusual crashes in WebRTC-related processes, unexpected child processes spawned from the browser, or anomalous network activity following media or signaling sessions. Such signals are not proof of exploitation but warrant investigation when the vulnerable component is present.

How to remediate

Patch first. Apply the vendor updates that address CVE-2022-2294 exactly as directed in each vendor’s advisory. CISA’s required action is to apply updates per vendor instructions; prioritize browsers and any other WebRTC-bearing products that appear in your inventory.

• Push updated browser packages through your standard software-deployment or autoupdate mechanisms and verify installation on endpoints.
• For applications that embed their own WebRTC library, obtain and deploy the vendor’s patched build; rebuilding from upstream WebRTC source is only appropriate if you maintain that component yourself and can confirm the fix.
• After patching, re-inventory to confirm no vulnerable versions remain, and document exceptions with compensating controls.
• As general hardening for this class of memory-corruption issue, keep browsers on vendor-supported channels, enable automatic updates where policy allows, and run browsers with least privilege and site isolation features that the vendor provides.

If you can't patch immediately

Reduce exposure until updates can be applied. Compensating controls do not replace the patch but can limit reachability and improve detection.

• Segment high-risk user populations and restrict unnecessary outbound peer-to-peer or media ports where business needs allow.
• Use enterprise browser management or extension control to disable or limit WebRTC features if your environment can operate without them; confirm the exact policy knobs against vendor documentation.
• Apply virtual patching or WAF/IPS rules only if your security vendor has published coverage specifically for this CVE; generic rules may not catch the trigger.
• Increase monitoring on browser processes for crash loops, heap-spray-like behavior indicators, and post-exploitation patterns (suspicious child processes, credential access, lateral movement). Retain browser and proxy logs for retrospective review.
• Block or carefully vet untrusted sites and content that could deliver crafted WebRTC input, and prefer managed, fully patched browser instances for high-value users.

If your data may have been exposed

Actively exploited vulnerabilities, including those with reported ransomware use, can lead to endpoint compromise and subsequent data theft. If you have evidence of exploitation or cannot rule it out, follow your incident-response process: isolate affected hosts, preserve forensic data, reset credentials that may have been accessible from the browser session, and assess whether sensitive data was reachable. You can also run a free exposure scan of your email addresses against known breach data to see whether associated accounts appear in prior breaches while you complete containment and recovery.