CVE-2021-23981

What it actually does

A texture upload of a Pixel Buffer Object could have confused the WebGL code to skip binding the buffer used to unpack it, resulting in memory corruption and a potentially exploitable information leak or crash.

Why it matters to the business

Attackers could extract sensitive data from browser memory or cause application instability across affected user bases, increasing support costs and exposure to data loss in environments relying on web rendering components.

How an attack unfolds

An attacker hosts a malicious page that triggers WebGL texture operations using a Pixel Buffer Object; the skipped buffer binding leads to memory corruption that an adversary can chain into information disclosure or denial of service.

How to fix it

Upgrade affected installations to the versions that contain the fix commit 6e56aee25439b7a3211a6704a9d60453ad623ae4; apply browser updates that resolve the WebGL binding issue.

How to confirm the fix worked

Confirm the updated commit or version is deployed and test WebGL texture upload paths with known-triggering payloads to verify the buffer binding occurs correctly.

Typical attack path

1. Deliver malicious content via web page or email attachment
2. Trigger WebGL texture upload with crafted Pixel Buffer Object
3. Exploit skipped buffer binding to corrupt memory
4. Leverage corruption for data leak or crash

How to detect it

Inspect browser crash logs and memory dumps for WebGL-related corruption patterns; correlate with access to untrusted web content.

What your security team should do

• Prioritize patching all instances to the fixed commit or equivalent browser release
• Monitor EPSS and exploit maturity signals for any increase in activity
• Review web application dependencies for downstream exposure