CVE-2021-33037
Description
Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 9.0.43-2 |
| sid | Fixed | 9.0.43-2 |
| forky | Fixed | 9.0.43-2 |
| bullseye | Fixed | 9.0.43-2~deb11u1 |
| bookworm | Fixed | 9.0.43-2 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Maven | org.apache.tomcat:tomcat | >=10.0.0-M1,<10.0.7 | 10.0.7 |
| Maven | org.apache.tomcat:tomcat | >=9.0.0-M1,<9.0.48 | 9.0.48 |
| Maven | org.apache.tomcat:tomcat | >=8.5.0,<8.5.68 | 8.5.68 |
References
- https://www.suse.com/security/cve/CVE-2021-33037.html
- https://nvd.nist.gov/vuln/detail/CVE-2021-33037
- https://github.com/apache/tomcat/commit/05f9e8b00f5d9251fcd3c95dcfd6cf84177f46c8
- https://github.com/apache/tomcat/commit/19d11556d0db99df291df33605f137976d152475
- https://github.com/apache/tomcat/commit/3202703e6d635e39b74262e81f0cb4bcbe2170dc
- https://github.com/apache/tomcat/commit/45d70a86a901cbd534f8f570bed2aec9f7f7b88e
- https://github.com/apache/tomcat/commit/506134f957a4be2c5b4a9334f7b3435fc954dbc1
- https://github.com/apache/tomcat/commit/8874fa02e9b36baa9ca6b226c0882c0190ca5a02
- https://github.com/apache/tomcat/commit/a2c3dc4c96168743ac0bab613709a5bbdaec41d0
- https://github.com/apache/tomcat/commit/da0e7cb093cf68b052d9175e469dbd0464441b0b
- https://github.com/apache/tomcat/commit/eee0d024c1b3171560c92eaba79dd6eb8eb11bcd
- https://security.gentoo.org/glsa/202208-34
- https://security.netapp.com/advisory/ntap-20210827-0007
- https://tomcat.apache.org/security-10.html
- https://tomcat.apache.org/security-8.html
- https://tomcat.apache.org/security-9.html
- https://www.debian.org/security/2021/dsa-4952
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://lists.debian.org/debian-lts-announce/2021/08/msg00009.html
- https://lists.apache.org/thread/kovg1bft77xo34ksrcskh5nl50p69962
- https://lists.apache.org/thread.html/rf1b54fd3f52f998ca4829159a88cc4c23d6cef5c6447d00948e75c97@%3Ccommits.tomee.apache.org%3E
- https://lists.apache.org/thread.html/re01e7e93154e8bdf78a11a23f9686427bd3d51fc6e12c508645567b7@%3Ccommits.tomee.apache.org%3E
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.