High severity · published Nov 1, 2022
CVE-2022-42252
Apache Tomcat request smuggling via malformed content-length
7.5
CVSS
1.6%
EPSS
No
On KEV
Description
If Apache Tomcat 8.5.0 to 8.5.82, 9.0.0-M1 to 9.0.67, 10.0.0-M1 to 10.0.26 or 10.1.0-M1 to 10.1.0 was configured to ignore invalid HTTP headers via setting rejectIllegalHeader to false (the default for 8.5.x only), Tomcat did not reject a request containing an invalid Content-Length header making a request smuggling attack possible if Tomcat was located behind a reverse proxy that also failed to reject the request with the invalid header.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.6% · higher than 75% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TO
Tomcat · Apache
10.1.0-M1 through 10.1.0; 10.0.0-M1 through 10.0.26; 9.0.0-M1 through 9.0.67; 8.5.0 through 8.5.82 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-42252
CVE.org
https://www.cve.org/CVERecord?id=CVE-2022-42252
Mailing List
https://lists.apache.org/thread/zzcxzvqfdqn515zfs3dxb7n8gty589sq
security.gentoo.org
https://security.gentoo.org/glsa/202305-37
More from Tomcat
9.8
CVE-2025-24813
Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUT
9.8
CVE-2020-1938
Apache Tomcat Improper Privilege Management Vulnerability
9.8
CVE-2016-8735
Remote code execution is possible with Apache Tomcat before 6.0.48, 7.x before 7.0.73, 8.x before 8.0.39, 8.5.x before 8.5.7, and 9.x before 9.0.0.M12 if…
8.1
CVE-2017-12617
When running Apache Tomcat versions 9.0.0.M1 to 9.0.0, 8.5.0 to 8.5.22, 8.0.0.RC1 to 8.0.46 and 7.0.0 to 7.0.81 with HTTP PUTs enabled (e.g
8.1
CVE-2017-12615
When running Apache Tomcat 7.0.0 to 7.0.79 on Windows with HTTP PUTs enabled (e.g