CVE-2021-33037
Incorrect Transfer-Encoding handling with HTTP/1.0
- State
- Published
- Severity
- Not scored
- Published
- Jul 12, 2021
- Updated
- Oct 8, 2026
- Reserved
- May 17, 2021
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.
Scores
The record has no CVSS score.
Weaknesses
- CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
Affected Products
| Product | Versions |
|---|---|
Apache TomcatApache Software Foundation |
|
References
- https://lists.apache.org/thread.html/r612a79269b0d5e5780c62dfd34286a8037232fec0bc6f1a7e60c9381%40%3Cannounce.tomcat.apache.org%3E
- https://www.oracle.com//security-alerts/cpujul2021.html
- [tomee-commits] 20210728 [jira] [Created] (TOMEE-3778) Update embedded Tomcat to 9.0.48 or later to address CVE-2021-33037mailing-list
- [tomee-commits] 20210728 [jira] [Commented] (TOMEE-3778) Update embedded Tomcat to 9.0.48 or later to address CVE-2021-33037mailing-list
- [debian-lts-announce] 20210805 [SECURITY] [DLA 2733-1] tomcat8 security updatemailing-list
- DSA-4952vendor-advisory
- [tomee-commits] 20210830 [jira] [Commented] (TOMEE-3778) Update embedded Tomcat to 9.0.48 or later to address CVE-2021-33037mailing-list
- [tomee-commits] 20210913 [jira] [Commented] (TOMEE-3778) Update embedded Tomcat to 9.0.48 or later to address CVE-2021-33037mailing-list
- [tomee-commits] 20210914 [jira] [Commented] (TOMEE-3778) Update embedded Tomcat to 9.0.48 or later to address CVE-2021-33037mailing-list
- [tomee-commits] 20210916 [jira] [Resolved] (TOMEE-3778) Update embedded Tomcat to 9.0.48 or later to address CVE-2021-33037mailing-list
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://security.netapp.com/advisory/ntap-20210827-0007/
- https://kc.mcafee.com/corporate/index?page=content&id=SB10366
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- GLSA-202208-34vendor-advisory
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