{"cve":{"cve_id":"CVE-2020-1935","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.09386,"epss_percentile":0.9476,"epss_as_of":"2026-06-23","description":"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.","published_at":"2020-02-24T21:11:38Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E","https://lists.debian.org/debian-lts-announce/2020/03/msg00006.html","http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.html","https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743%40%3Ccommits.tomee.apache.org%3E","https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78%40%3Ccommits.tomee.apache.org%3E","https://www.debian.org/security/2020/dsa-4673","https://www.debian.org/security/2020/dsa-4680","https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html","https://www.oracle.com/security-alerts/cpujul2020.html","https://security.netapp.com/advisory/ntap-20200327-0005/","https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75%40%3Cusers.tomcat.apache.org%3E","https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919%40%3Cusers.tomcat.apache.org%3E","https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18%40%3Cusers.tomcat.apache.org%3E","https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7%40%3Cusers.tomcat.apache.org%3E","https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1%40%3Cusers.tomcat.apache.org%3E","https://usn.ubuntu.com/4448-1/","https://www.oracle.com/security-alerts/cpuoct2020.html","https://www.oracle.com/security-alerts/cpujan2021.html","https://lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6%40%3Cdev.tomcat.apache.org%3E"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:13:43.644771Z"},"effective_severity":null,"badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"apache","vendor_name":"apache","product_slug":"apache-tomcat","product_name":"Apache Tomcat","version_start":"Apache Tomcat 9.0.0.M1 to 9.0.30","version_start_inclusive":true,"version_end":"Apache Tomcat 9.0.0.M1 to 9.0.30","version_end_inclusive":true,"cpe23_uri":"cve5:apache:apache-tomcat:Apache Tomcat 9.0.0.M1 to 9.0.30:Apache Tomcat 9.0.0.M1 to 9.0.30"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"apache-tomcat","product_name":"Apache Tomcat","version_start":"8.5.0 to 8.5.50","version_start_inclusive":true,"version_end":"8.5.0 to 8.5.50","version_end_inclusive":true,"cpe23_uri":"cve5:apache:apache-tomcat:8.5.0 to 8.5.50:8.5.0 to 8.5.50"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"apache-tomcat","product_name":"Apache Tomcat","version_start":"7.0.0 to 7.0.99","version_start_inclusive":true,"version_end":"7.0.0 to 7.0.99","version_end_inclusive":true,"cpe23_uri":"cve5:apache:apache-tomcat:7.0.0 to 7.0.99:7.0.0 to 7.0.99"}],"exploit_refs":[],"news":[],"references":[{"url":"https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.debian.org/debian-lts-announce/2020/03/msg00006.html","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.html","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743%40%3Ccommits.tomee.apache.org%3E","source_type":"MAILING_LIST","tags":["mailing-list","patch"]},{"url":"https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78%40%3Ccommits.tomee.apache.org%3E","source_type":"MAILING_LIST","tags":["mailing-list","patch"]},{"url":"https://www.debian.org/security/2020/dsa-4673","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://www.debian.org/security/2020/dsa-4680","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://www.oracle.com/security-alerts/cpujul2020.html","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20200327-0005/","source_type":"MISC","tags":[]},{"url":"https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75%40%3Cusers.tomcat.apache.org%3E","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919%40%3Cusers.tomcat.apache.org%3E","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18%40%3Cusers.tomcat.apache.org%3E","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7%40%3Cusers.tomcat.apache.org%3E","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1%40%3Cusers.tomcat.apache.org%3E","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://usn.ubuntu.com/4448-1/","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://www.oracle.com/security-alerts/cpuoct2020.html","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://www.oracle.com/security-alerts/cpujan2021.html","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6%40%3Cdev.tomcat.apache.org%3E","source_type":"MAILING_LIST","tags":["mailing-list"]}],"timeline":[{"type":"published","at":"2020-02-24T21:11:38Z","label":"CVE published","source":null}]}