A flaw was found in Undertow that tripped the client-side invocation timeout with certain calls made over HTTP2. This flaw allows an attacker to carry out denial of service attacks.
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This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 50% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
A flaw was found in Undertow that tripped the client-side invocation timeout with certain calls made over HTTP2. This flaw allows an attacker to carry out denial of service attacks.
August 26, 2022
November 21, 2024
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.3.11 Security update
Red Hat Security Advisory: Red Hat Single Sign-On 7.5.1 security update on RHEL 7
Red Hat Security Advisory: Red Hat Single Sign-On 7.5.1 security update on RHEL 8
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | eap7-xml-security-0:2.0.10-2.redhat_00002.1.ep7.el7 | 2025-04-28 | redhat |
| redhat | eap7-xml-security-0:2.2.3-2.redhat_00001.1.el7eap | 2024-11-25 | redhat |
| redhat | undertow | 2022-07-07 | redhat |
| redhat | rh-sso7-keycloak-0:15.0.4-1.redhat_00003.1.el7sso | 2022-02-07 | redhat |
| redhat | rh-sso7-keycloak-0:15.0.4-1.redhat_00003.1.el8sso | 2022-02-07 | redhat |
| redhat | rh-sso-7/sso74-openj9-openshift-rhel8:7.4-59 | 2022-02-02 | redhat |
| redhat | eap7-undertow-0:2.2.13-1.SP2_redhat_00001.1.el7eap | 2022-02-02 | redhat |
| redhat | rh-sso-7/sso7-rhel8-operator-bundle:7.5.1-8 | 2022-02-02 | redhat |
| redhat | eap7-undertow-0:2.0.41-2.SP2_redhat_00001.1.el8eap | 2022-02-02 | redhat |
| redhat | io.undertow/undertow-core:2.2.13.SP2-redhat-00001 | 2022-02-02 | redhat |
| redhat | eap7-undertow-0:2.2.13-1.SP2_redhat_00001.1.el8eap | 2022-02-02 | redhat |
| redhat | rh-sso-7/sso74-openshift-rhel8:7.4-44 | 2022-02-02 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| io.undertow:undertow-core | 1.0.0.Alpha1 ... 2.2.9.Final (283 versions) | 2.2.15 | — |
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
RHSA-2022:0400 — Important
RHSA-2022:0401 — Important
RHSA-2022:0404 — Important
RHSA-2022:0405 — Important
RHSA-2022:0406 — Important
RHSA-2022:0407 — Important
RHSA-2022:0408 — Important
RHSA-2022:0409 — Important
RHSA-2022:0410 — Important
RHSA-2022:0415 — Important
RHSA-2022:1179 — Important
RHSA-2022:5532 — Important
RHSA-2025:4226 — Important
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-3859
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redhat
CWE-668