{"id":"CVE-2020-1935","published":"2020-02-24T21:11:38Z","modified":"2026-10-08T21:03:23Z","title":"In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach…","vendor":"Apache","product":"Apache Tomcat","tier":"tail","description":{"text":"In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.","provenance":"source","from":"CVE.org"},"cvss":null,"epss":{"score":0.09386,"percentile":0.95386,"provenance":"source"},"cwes":[],"references":[{"url":"https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.debian.org/debian-lts-announce/2020/03/msg00006.html","tags":["mailing-list","x_refsource_MLIST"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.html","tags":["vendor-advisory","x_refsource_SUSE"]},{"url":"https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743%40%3Ccommits.tomee.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78%40%3Ccommits.tomee.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://www.debian.org/security/2020/dsa-4673","tags":["vendor-advisory","x_refsource_DEBIAN"]},{"url":"https://www.debian.org/security/2020/dsa-4680","tags":["vendor-advisory","x_refsource_DEBIAN"]},{"url":"https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://www.oracle.com/security-alerts/cpujul2020.html","tags":["x_refsource_MISC"]},{"url":"https://security.netapp.com/advisory/ntap-20200327-0005/","tags":["x_refsource_CONFIRM"]},{"url":"https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75%40%3Cusers.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919%40%3Cusers.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18%40%3Cusers.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7%40%3Cusers.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1%40%3Cusers.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://usn.ubuntu.com/4448-1/","tags":["vendor-advisory","x_refsource_UBUNTU"]},{"url":"https://www.oracle.com/security-alerts/cpuoct2020.html","tags":["x_refsource_MISC"]},{"url":"https://www.oracle.com/security-alerts/cpujan2021.html","tags":["x_refsource_MISC"]},{"url":"https://lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6%40%3Cdev.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]}],"priority":{"score":19.1,"factors":[{"name":"EPSS percentile","points":19.08}]},"vendorSlug":"apache","affectedVersions":[{"vendor":"Apache","product":"Apache Tomcat","versions":["Apache Tomcat 9.0.0.M1 to 9.0.30","8.5.0 to 8.5.50","7.0.0 to 7.0.99"]}],"affected":[{"ecosystem":"Maven","package":"org.apache.tomcat.embed:tomcat-embed-core","vulnerableRanges":["<7.0.100",">=8.0.0, <8.5.51",">=9.0.0, <9.0.31"],"patched":["7.0.100","8.5.51","9.0.31"],"from":["GHSA-qxf4-chvg-4r8r"],"provenance":"source"},{"ecosystem":"Maven","package":"org.apache.tomcat:tomcat","vulnerableRanges":["<7.0.100",">=8.0.0, <8.5.51",">=9.0.0, <9.0.31"],"patched":["7.0.100","8.5.51","9.0.31"],"from":["GHSA-qxf4-chvg-4r8r"],"provenance":"source"}],"euvd":{"id":"EUVD-2020-0311","exploited":false,"provenance":"source"},"lineage":{"packageHistory":[{"cve":"CVE-2019-0221","published":"2019-05-28","fixed":"9.0.17","kev":false,"link":{"from":"CVE-2019-0221","to":"CVE-2020-1935","relation":"successor","confidence":"low","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"Maven:org.apache.tomcat:tomcat","fromFixed":"8.5.40","toFixed":"8.5.51","daysApart":272},{"kind":"version-step","provenance":"source","package":"Maven:org.apache.tomcat:tomcat","fromFixed":"7.0.94","toFixed":"7.0.100","daysApart":272}]}},{"cve":"CVE-2022-25762","published":"2022-05-13","fixed":"9.0.20","kev":false},{"cve":"CVE-2019-17569","published":"2020-02-24","fixed":"9.0.31","kev":false},{"cve":"CVE-2020-1935","published":"2020-02-24","fixed":"9.0.31","kev":false},{"cve":"CVE-2020-11996","published":"2020-06-26","fixed":"10.0.0-M5","kev":false},{"cve":"CVE-2020-13934","published":"2020-07-14","fixed":"10.0.0-M6","kev":false},{"cve":"CVE-2020-13935","published":"2020-07-14","fixed":"10.0.0-M7","kev":false}],"package":"Maven:org.apache.tomcat:tomcat"}}