CVE-2021-43980
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…
Does this matter?
Lower severity and a low EPSS score (1.89%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 3.7 LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 1.89% probability · 78th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- apache/tomcat · debian/debian linux
- Source
- security@apache.org
References
- http://www.openwall.com/lists/oss-security/2022/09/28/1Mailing List, Third Party Advisory
- https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3Mailing List, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00029.htmlMailing List, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5265Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/09/28/1Mailing List, Third Party Advisory
- https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3Mailing List, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00029.htmlMailing List, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5265Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.