Vulnerability · Published Aug 26, 2022 · Assigned by redhat
CVE-2021-3859
High 7.5
In plain English
A high-severity security flaw in undertow. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.7% (higher than 78% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.7%top 22.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | undertow | 2.2.16-1 | DEBIAN-CVE-2021-3859 |
| Maven | io.undertow:undertow-core | 2.2.15 | GHSA-339q-62wm-c39w |
| Ubuntu:25.10 | undertow | no fix listed | UBUNTU-CVE-2021-3859 |
| Ubuntu:26.04:LTS | undertow | no fix listed | UBUNTU-CVE-2021-3859 |
| Ubuntu:26.10 | undertow | no fix listed | UBUNTU-CVE-2021-3859 |
Affected products (as reported)
Weakness: CWE-214
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2010378
- https://issues.redhat.com/browse/UNDERTOW-1979
- https://github.com/undertow-io/undertow/pull/1296
- https://github.com/undertow-io/undertow/commit/e43f0ada3f4da6e8579e0020cec3cb1a81e487c2
- https://access.redhat.com/security/cve/CVE-2021-3859
- https://security.netapp.com/advisory/ntap-20221201-0004/