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Vulnerability record · CVE-2021-3859 · published 26 August 2022

CVE-2021-3859: Redhat jboss enterprise application platform exposure of resource to wrong sphere vulnerability

Redhat · Jboss Enterprise Application Platform

A flaw was found in Undertow that tripped the client-side invocation timeout with certain calls made over HTTP2. This flaw allows an attacker to carry out denial of service attacks.

7.5 CVSS 3.1 High EPSS 1.6% · top 24.6% CWE-214 · CWE-214CWE-668 · Exposure of resource to wrong sphere
7.5CVSS 3.1 base score
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

A flaw was found in Undertow that tripped the client-side invocation timeout with certain calls made over HTTP2. This flaw allows an attacker to carry out denial of service attacks.

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

Affected products

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

References

LinkTags
https://access.redhat.com/security/cve/CVE-2021-3859 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2010378 Issue TrackingVendor Advisory
https://github.com/undertow-io/undertow/commit/e43f0ada3f4da6e8579e0020cec3cb1a81e487c2 PatchThird Party Advisory
https://github.com/undertow-io/undertow/pull/1296 Third Party Advisory
https://issues.redhat.com/browse/UNDERTOW-1979 Issue TrackingPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20221201-0004/ Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-3859 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2010378 Issue TrackingVendor Advisory
https://github.com/undertow-io/undertow/commit/e43f0ada3f4da6e8579e0020cec3cb1a81e487c2 PatchThird Party Advisory
https://github.com/undertow-io/undertow/pull/1296 Third Party Advisory
https://issues.redhat.com/browse/UNDERTOW-1979 Issue TrackingPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20221201-0004/ Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-3859), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.