{"id":"CVE-2021-3690","aliases":["GHSA-fj7c-vg2v-ccrm"],"url":"https://o3.security/vulnerability/CVE-2021-3690","summary":"Undertow vulnerable to memory exhaustion due to buffer leak","details":"A flaw was found in Undertow. A buffer leak on the incoming WebSocket PONG message may lead to memory exhaustion. This flaw allows an attacker to cause a denial of service. The highest threat from this vulnerability is availability.","published":"2022-08-23T16:15:09.450Z","modified":"2026-07-09T01:31:23.774057Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.01677,"percentile":0.74714,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Maven","name":"io.undertow:undertow-core","fixedVersion":"2.0.40"},{"ecosystem":"Maven","name":"io.undertow:undertow-core","fixedVersion":"2.2.10"}],"fix":{"url":"https://github.com/undertow-io/undertow/commit/c7e84a0b7efced38506d7d1dfea5902366973877","label":"undertow-io/undertow@c7e84a0"},"references":[{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2021-3690"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1991299"},{"type":"REPORT","url":"https://issues.redhat.com/browse/UNDERTOW-1935"},{"type":"FIX","url":"https://github.com/undertow-io/undertow/commit/c7e84a0b7efced38506d7d1dfea5902366973877"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T01:31:23.774057Z"}}