CVE-2021-30602Public exploitNetwork attack vector

Code execution via WebRTC memory reuse

Published Aug 26, 2021 · Updated Aug 3, 2024

Use after free in WebRTC in Google Chrome before 92.0.4515.159 allows remote attackers to execute arbitrary code via crafted HTML. TrackAddIceCandidate accesses an ICE candidate after setLocalDescription and garbage collection mark its backing memory for reuse. A user must visit a malicious website; controlled reuse of the freed memory enables code execution in the Chrome process.

CVSS severity8.8
High
EPSS probability2.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use after free in WebRTC in Google Chrome before 92.0.4515.159 allows remote attackers to execute arbitrary code via crafted HTML. TrackAddIceCandidate accesses an ICE candidate after setLocalDescription and garbage collection mark its backing memory for reuse. A user must visit a malicious website; controlled reuse of the freed memory enables code execution in the Chrome process.

The record

CVE
CVE-2021-30602
Published
Aug 26, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <92.0.4515.159

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=unspecified <92.0.4515.159

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.3Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

Public exploit references

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

Technologies

Your stack

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Your stack

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