CVE-2021-37979Public exploitNetwork attack vector

Remote code execution via WebRTC stream feedback

Published Nov 2, 2021 · Updated Aug 4, 2024

Heap buffer overflow in Google Chrome WebRTC before 94.0.4606.81 allows remote attackers to execute code through a crafted HTML page. RTPSenderVideoFrameTransformerDelegate::SendVideo copies transformed frame data after a Promise writes read data back into the stream, allowing its ArrayBuffer to be freed before reuse. A user must visit the malicious site and permit webcam access under default settings; successful corruption executes code in the browser process.

CVSS severity8.8
High
EPSS probability1.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Heap buffer overflow in Google Chrome WebRTC before 94.0.4606.81 allows remote attackers to execute code through a crafted HTML page. RTPSenderVideoFrameTransformerDelegate::SendVideo copies transformed frame data after a Promise writes read data back into the stream, allowing its ArrayBuffer to be freed before reuse. A user must visit the malicious site and permit webcam access under default settings; successful corruption executes code in the browser process.

The record

CVE
CVE-2021-37979
Published
Nov 2, 2021
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-122, CWE-787, T1203, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <94.0.4606.81

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=unspecified <94.0.4606.81

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.1Cisco TalosCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo