CVE-2021-3859
Undertow vulnerable to Denial of Service (DoS) attacks
7.5
HIGH
CVSS 3.1
EPSS 0.26%
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.
How to fix CVE-2021-3859
To remediate CVE-2021-3859, upgrade the affected package to a fixed version below.
- Debian/undertow—upgrade to 2.2.16-1 or later
- —upgrade to 2.2.15 or later
Is CVE-2021-3859 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2.2.16-1
- from 0, < 2.2.15
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |