| Name | CVE-2021-43980 |
| 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3160-1, DSA-5265-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| tomcat7 (PTS) | jessie, jessie (lts) | 7.0.56-3+really7.0.109-1+deb8u6 | vulnerable |
| stretch | 7.0.75-1 | vulnerable | |
| tomcat8 (PTS) | jessie, jessie (lts) | 8.0.14-1+deb8u28 | vulnerable |
| stretch (security) | 8.5.54-0+deb9u8 | vulnerable | |
| stretch (lts), stretch | 8.5.54-0+deb9u15 | vulnerable | |
| tomcat9 (PTS) | buster (security), buster, buster (lts) | 9.0.31-1~deb10u12 | fixed |
| bullseye (security), bullseye | 9.0.43-2~deb11u10 | fixed | |
| bookworm | 9.0.70-2 | fixed | |
| sid, trixie | 9.0.95-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| tomcat7 | source | stretch | (unfixed) | end-of-life | ||
| tomcat7 | source | (unstable) | (unfixed) | |||
| tomcat8 | source | (unstable) | (unfixed) | |||
| tomcat9 | source | buster | 9.0.31-1~deb10u7 | DLA-3160-1 | ||
| tomcat9 | source | bullseye | 9.0.43-2~deb11u4 | DSA-5265-1 | ||
| tomcat9 | source | (unstable) | 9.0.62-1 |
https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3
https://github.com/apache/tomcat/commit/170e0f792bd18ff031677890ba2fe50eb7a376c1 (9.0.61)
https://github.com/apache/tomcat/commit/4a00b0c0890538b9d3107eef8f2e0afadd119beb (8.5.78)
[jessie] - tomcat7 <ignored> (Possibly backwards incompatible changes)
[stretch] - tomcat8 <ignored> (Possibly backwards incompatible changes)
[jessie] - tomcat8 <ignored> (Possibly backwards incompatible changes)