Vulnerability · Published Feb 23, 2021 · Assigned by redhat
CVE-2020-27782
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 1.4% (higher than 72% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.4%top 27.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | undertow | 2.2.4-1 | DEBIAN-CVE-2020-27782 |
| Maven | io.undertow:undertow-core | 2.1.5 | GHSA-rhcw-wjcm-9h6g |
| Maven | io.undertow:undertow-core | 2.0.33 | GHSA-rhcw-wjcm-9h6g |
| Ubuntu:25.10 | undertow | no fix listed | UBUNTU-CVE-2020-27782 |
| Ubuntu:26.04:LTS | undertow | no fix listed | UBUNTU-CVE-2020-27782 |
| Ubuntu:26.10 | undertow | no fix listed | UBUNTU-CVE-2020-27782 |
Affected products (as reported)
Weakness: CWE-400
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1901304 x_refsource_MISC