{"cve":"CVE-2020-27782","nvd":{"published":"2021-02-23T19:15:13.150","modified":"2026-06-17T03:09:38.047","status":"Modified","description":"A flaw was found in the Undertow AJP connector. Malicious requests and abrupt connection closes could be triggered by an attacker using query strings with non-RFC compliant characters resulting in a denial of service. The highest threat from this vulnerability is to system availability. This affects Undertow 2.1.5.SP1, 2.0.33.SP2, and 2.2.3.SP1.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1901304","https://bugzilla.redhat.com/show_bug.cgi?id=1901304"],"products":["redhat:jboss_fuse","redhat:openshift_application_runtimes","redhat:undertow"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2020-27782","score":0.01375,"percentile":0.72034,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-rhcw-wjcm-9h6g","url":"https://osv.dev/vulnerability/GHSA-rhcw-wjcm-9h6g","summary":"Denial of service in Undertow","modified":"2023-11-08T04:03:22.177453Z","packages":[{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":[">=2.1.0 <2.1.5"],"fixed":["2.1.5"]},{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":["<2.0.33"],"fixed":["2.0.33"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}