CVE-2021-43980

Aliases:GHSA-jx7c-7mj5-9438BIT-tomcat-2021-43980
Advisory lineage Upstream: 0 Downstream: 12
Modified
Published: 28 Sept 2022, 00:00
Last modified:21 May 2025, 15:00

Vulnerability Summary

Overall Risk (default)
low
15/100
CVSS Score
3.7 LOW
v3.1 (cve.org)
EPSS Score
0.2% LOW
0% probability +0.01%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

28 Sept 2022, 00:00
Published
Vulnerability first disclosed
21 May 2025, 15:00
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•LOW•Score: 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Trends

Current EPSS score: 0.20%• Percentile: 42%

Techniques & Countermeasures

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

    The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Affected Systems

  • apache software foundation•apache tomcat

    10.1.0-M1 to 10.1.0-M12 | 10.0.0-M1 to 10.0.18 | 9.0.0-M1 to 9.0.60 | 8.5.0 to 8.5.77

  • Unknown•Tomcat

    ≥ 8.5.0, ≤ 8.5.77 | ≥ 9.0.0, ≤ 9.0.60 | ≥ 10.0.0, ≤ 10.0.18 | 10.1.0:milestone1 | 10.1.0:milestone10 | 10.1.0:milestone11 | 10.1.0:milestone12 | 10.1.0:milestone2 | 10.1.0:milestone3 | 10.1.0:milestone4 | 10.1.0:milestone5 | 10.1.0:milestone6 | 10.1.0:milestone7 | 10.1.0:milestone8 | 10.1.0:milestone9

  • debian•debian_linux

    10.0 | 11.0

  • org.apache.tomcat•tomcat

    ≥ 8.5.0, < 8.5.78 | ≥ 9.0.0-M1, < 9.0.62 | ≥ 10.0.0-M1, < 10.0.20 | ≥ 10.1.0-M1, < 10.1.0-M14

References (13)