CVE-2021-43980

Severity CVSS v4.0:

Pending analysis

Type:

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Publication date:

28/09/2022

Last modified:

21/05/2025

Description

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.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS v3.1 Severity and Metrics:

Base Score: 3.70 LOW
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): None
Availability (A): None

Base Score 3.x

3.70

Severity 3.x

LOW

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:apache:tomcat::::::::	8.5.0 (including)	8.5.77 (including)
cpe:2.3:a:apache:tomcat::::::::	9.0.0 (including)	9.0.60 (including)
cpe:2.3:a:apache:tomcat::::::::	10.0.0 (including)	10.0.18 (including)
cpe:2.3:a:apache:tomcat:10.1.0:milestone1::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone10::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone11::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone12::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone2::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone3::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone4::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone5::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone6::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone7::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone8::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone9::::::

To consult the complete list of CPE names with products and versions, see this page

CPE	From	Up to
cpe:2.3:a:apache:tomcat::::::::	8.5.0 (including)	8.5.77 (including)
cpe:2.3:a:apache:tomcat::::::::	9.0.0 (including)	9.0.60 (including)
cpe:2.3:a:apache:tomcat::::::::	10.0.0 (including)	10.0.18 (including)
cpe:2.3:a:apache:tomcat:10.1.0:milestone1::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone10::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone11::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone12::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone2::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone3::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone4::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone5::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone6::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone7::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone8::::::
cpe:2.3:a:apache:tomcat:10.1.0:milestone9::::::

CVE-2021-43980

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools