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CVE-2021-43980

Good to know:

Date: September 27, 2022

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.

Language: Java

Severity Score

3.7

Related Resources (16)

Url: https://github.com/apache/tomcat/commit/9651b83a1d04583791525e5f0c4c9089f678d9fc

Url: http://www.openwall.com/lists/oss-security/2022/09/28/1

Url: https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3

Url: https://tomcat.apache.org/security-8.html

Url: https://access.redhat.com/security/cve/CVE-2021-43980

Url: https://tomcat.apache.org/security-10.html

Url: https://lists.debian.org/debian-lts-announce/2022/10/msg00029.html

Url: https://github.com/apache/tomcat

Url: https://github.com/apache/tomcat/commit/4a00b0c0890538b9d3107eef8f2e0afadd119beb

Url: https://github.com/apache/tomcat/commit/17f177eeb7df5938f67ef9ea580411b120195f13

Url: https://tomcat.apache.org/security-9.html

Url: https://github.com/apache/tomcat/commit/170e0f792bd18ff031677890ba2fe50eb7a376c1

Url: https://nvd.nist.gov/vuln/detail/CVE-2021-43980

Url: https://security-tracker.debian.org/tracker/CVE-2021-43980

Url: https://www.debian.org/security/2022/dsa-5265

Url: https://www.mend.io/vulnerability-database/CVE-2021-43980

Severity Score

3.7

Weakness Type (CWE)

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

CWE-362

Top Fix

Upgrade Version

Upgrade to version org.apache.tomcat:tomcat:8.5.78;org.apache.tomcat:tomcat:9.0.62;org.apache.tomcat:tomcat:10.0.20;org.apache.tomcat:tomcat:10.1.0-M14

Learn More

CVSS v3.1

Base Score:	3.7
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

Mend.io Vulnerability Database

We found results for “”

CVE-2021-43980

Good to know:

Date: September 27, 2022

Language: Java

Severity Score

Related Resources (16)

Severity Score

Weakness Type (CWE)

Top Fix

Upgrade Version

CVSS v3.1

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