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Vulnerability record · CVE-2021-3690 · published 23 August 2022

CVE-2021-3690: Redhat fuse uncontrolled resource consumption vulnerability

Redhat · Fuse

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.

7.5 CVSS 3.1 High EPSS 1.7% · top 23.9% CWE-400 · Uncontrolled resource consumptionCWE-401 · Memory leak
7.5CVSS 3.1 base score
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/CVE-2021-3690 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1991299 Issue TrackingVendor Advisory
https://github.com/undertow-io/undertow/commit/c7e84a0b7efced38506d7d1dfea5902366973877 PatchThird Party Advisory
https://issues.redhat.com/browse/UNDERTOW-1935 ExploitIssue TrackingMitigationVendor Advisory
https://access.redhat.com/security/cve/CVE-2021-3690 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1991299 Issue TrackingVendor Advisory
https://github.com/undertow-io/undertow/commit/c7e84a0b7efced38506d7d1dfea5902366973877 PatchThird Party Advisory
https://issues.redhat.com/browse/UNDERTOW-1935 ExploitIssue TrackingMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-3690), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.