The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-3160-1 tomcat9 security update
Debian DSA Debian DSA DSA-5265-1 tomcat9 security update
EUVD EUVD EUVD-2022-6865 The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.
Github GHSA Github GHSA GHSA-jx7c-7mj5-9438 Apache Tomcat Race Condition vulnerability
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 21 May 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2025-05-21T15:00:10.097Z

Reserved: 2021-11-17T00:00:00.000Z

Link: CVE-2021-43980

cve-icon Vulnrichment

Updated: 2024-08-04T04:10:16.914Z

cve-icon NVD

Status : Modified

Published: 2022-09-28T14:15:09.880

Modified: 2025-05-21T15:15:55.223

Link: CVE-2021-43980

cve-icon Redhat

Severity : Low

Publid Date: 2022-09-28T00:00:00Z

Links: CVE-2021-43980 - Bugzilla

cve-icon OpenCVE Enrichment

No data.