Vulnerability · Published Aug 23, 2022 · Assigned by redhat
CVE-2021-3690
High 7.5
In plain English
A high-severity uncontrolled resource consumption in undertow. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.8% (higher than 78% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.8%top 21.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | undertow | 2.2.10-1 | DEBIAN-CVE-2021-3690 |
| Maven | io.undertow:undertow-core | 2.0.40 | GHSA-fj7c-vg2v-ccrm |
| Maven | io.undertow:undertow-core | 2.2.10 | GHSA-fj7c-vg2v-ccrm |
| Ubuntu:25.10 | undertow | no fix listed | UBUNTU-CVE-2021-3690 |
| Ubuntu:26.04:LTS | undertow | no fix listed | UBUNTU-CVE-2021-3690 |
| Ubuntu:26.10 | undertow | no fix listed | UBUNTU-CVE-2021-3690 |
Affected products (as reported)
Weakness: CWE-400
References
- https://issues.redhat.com/browse/UNDERTOW-1935 x_refsource_MISC
- https://bugzilla.redhat.com/show_bug.cgi?id=1991299 x_refsource_MISC
- https://access.redhat.com/security/cve/CVE-2021-3690 x_refsource_MISC
- https://github.com/undertow-io/undertow/commit/c7e84a0b7efced38506d7d1dfea5902366973877 x_refsource_MISC