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Package details: pkg:maven/io.undertow/undertow-core@2.1.0
purl pkg:maven/io.undertow/undertow-core@2.1.0
Tags Ghost
Next non-vulnerable version 2.3.20.Final
Latest non-vulnerable version 2.4.0.Beta1
Risk 4.0
Vulnerabilities affecting this package (5)
Vulnerability Summary Fixed by
VCID-14ff-vn3t-vyhy
Aliases:
CVE-2021-3690
GHSA-fj7c-vg2v-ccrm
GMS-2022-2964
Undertow vulnerable to memory exhaustion due to buffer leak Buffer leak on incoming WebSocket PONG message(s) in Undertow before 2.0.40 and 2.2.10 can lead to memory exhaustion and allow a denial of service.
2.2.10.Final
Affected by 13 other vulnerabilities.
2.2.10
Affected by 0 other vulnerabilities.
VCID-beaj-uk9m-17be
Aliases:
CVE-2020-27782
GHSA-rhcw-wjcm-9h6g
Denial of service in Undertow 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.
2.1.5
Affected by 1 other vulnerability.
2.1.6.Final
Affected by 16 other vulnerabilities.
2.2.4.Final
Affected by 15 other vulnerabilities.
VCID-bpuw-kn4r-6kau
Aliases:
CVE-2021-20220
GHSA-qjwc-v72v-fq6r
HTTP request smuggling in Undertow A flaw was found in Undertow. A regression in the fix for CVE-2020-10687 was found. HTTP request smuggling related to CVE-2017-2666 is possible against HTTP/1.x and HTTP/2 due to permitting invalid characters in an HTTP request. This flaw allows an attacker to poison a web-cache, perform an XSS attack, or obtain sensitive information from request other than their own. The highest threat from this vulnerability is to data confidentiality and integrity.
2.1.6
Affected by 0 other vulnerabilities.
2.1.6.Final
Affected by 16 other vulnerabilities.
VCID-gsr8-1dea-effx
Aliases:
CVE-2021-3597
GHSA-mfhv-gwf8-4m88
undertow Race Condition vulnerability A flaw was found in undertow. The HTTP2SourceChannel fails to write the final frame under some circumstances, resulting in a denial of service. The highest threat from this vulnerability is availability. This flaw affects Undertow versions prior to 2.0.35.SP1, prior to 2.2.6.SP1, prior to 2.2.7.SP1, prior to 2.0.36.SP1, prior to 2.2.9.Final and prior to 2.0.39.Final.
2.2.9.Final
Affected by 14 other vulnerabilities.
VCID-yn69-8upm-7yc2
Aliases:
CVE-2021-3629
GHSA-rf6q-vx79-mjxr
Undertow Uncontrolled Resource Consumption A flaw was found in Undertow. A potential security issue in flow control handling by the browser over HTTP/2 may potentially cause overhead or a denial of service in the server. The highest threat from this vulnerability is availability. This flaw affects Undertow versions prior to 2.0.40.Final and prior to 2.2.11.Final.
2.2.11.Final
Affected by 12 other vulnerabilities.
Vulnerabilities fixed by this package (0)
Vulnerability Summary Aliases
This package is not known to fix vulnerabilities.

Date Actor Action Vulnerability Source VulnerableCode Version
2026-04-04T14:32:33.678799+00:00 GHSA Importer Fixing VCID-sxup-wzjc-tue1 https://github.com/advisories/GHSA-2w73-fqqj-c92p 38.1.0
2026-04-03T21:27:30.187311+00:00 GitLab Importer Affected by VCID-14ff-vn3t-vyhy https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/io.undertow/undertow-core/CVE-2021-3690.yml 38.1.0
2026-04-03T21:27:03.445250+00:00 GitLab Importer Affected by VCID-yn69-8upm-7yc2 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/io.undertow/undertow-core/CVE-2021-3629.yml 38.1.0
2026-04-03T21:26:59.387127+00:00 GitLab Importer Affected by VCID-gsr8-1dea-effx https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/io.undertow/undertow-core/CVE-2021-3597.yml 38.1.0
2026-04-02T16:57:29.973527+00:00 GHSA Importer Affected by VCID-bpuw-kn4r-6kau https://github.com/advisories/GHSA-qjwc-v72v-fq6r 38.1.0
2026-04-02T12:37:58.522014+00:00 GitLab Importer Affected by VCID-bpuw-kn4r-6kau https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/io.undertow/undertow-core/CVE-2021-20220.yml 38.0.0
2026-04-01T16:02:30.616368+00:00 GHSA Importer Affected by VCID-yn69-8upm-7yc2 https://github.com/advisories/GHSA-rf6q-vx79-mjxr 38.0.0
2026-04-01T16:02:30.532083+00:00 GHSA Importer Affected by VCID-gsr8-1dea-effx https://github.com/advisories/GHSA-mfhv-gwf8-4m88 38.0.0
2026-04-01T15:59:30.007636+00:00 GHSA Importer Affected by VCID-beaj-uk9m-17be https://github.com/advisories/GHSA-rhcw-wjcm-9h6g 38.0.0
2026-04-01T13:10:22.124490+00:00 GithubOSV Importer Fixing VCID-sxup-wzjc-tue1 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-2w73-fqqj-c92p/GHSA-2w73-fqqj-c92p.json 38.0.0