CVE-2021-3690

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

A flaw was found in Undertow. A buffer leak on the incoming WebSocket PONG message may lead to memory exhaustion. This flaw allows an attacker to cause a denial of service. The highest threat from this vulnerability is availability.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-400 CWE-401

Affected software

Vendor	Product	Versions
n/a	undertow	Fixed in 2.2.10.Final, 2.0.40.Final

References

https://access.redhat.com/security/cve/CVE-2021-3690Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1991299Issue Tracking, Vendor Advisory
https://github.com/undertow-io/undertow/commit/c7e84a0b7efced38506d7d1dfea5902366973877Patch, Third Party Advisory
https://issues.redhat.com/browse/UNDERTOW-1935Exploit, Issue Tracking, Mitigation, Vendor Advisory
https://access.redhat.com/security/cve/CVE-2021-3690Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1991299Issue Tracking, Vendor Advisory
https://github.com/undertow-io/undertow/commit/c7e84a0b7efced38506d7d1dfea5902366973877Patch, Third Party Advisory
https://issues.redhat.com/browse/UNDERTOW-1935Exploit, Issue Tracking, Mitigation, Vendor Advisory

Timeline

Published: Aug 23, 2022
Last modified: Jun 17, 2026
NVD status: Modified

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