CVE-2022-21716
twisted - security update
7.5
HIGH
CVSS 3.1
EPSS 3.7%
Description
Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 22.2.0, Twisted SSH client and server implement is able to accept an infinite amount of data for the peer's SSH version identifier. This ends up with a buffer using all the available memory. The attach is a simple as `nc -rv localhost 22 < /dev/zero`. A patch is available in version 22.2.0. There are currently no known workarounds.
How to fix CVE-2022-21716
To remediate CVE-2022-21716, upgrade the affected package to a fixed version below.
- —upgrade to 20.3.0-7+deb11u1 or later
- —upgrade to 16.6.0-2+deb9u2 or later
- —upgrade to 22.2.0 or later
- —upgrade to 89c395ee794e85a9657b112c4351417850330ef9 or later
Is CVE-2022-21716 being exploited?
Low — EPSS is 3.7%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 20.3.0-7+deb11u1
- from 0, < 16.6.0-2+deb9u2
- >= 21.7.0, < 22.2.0
- from 0, < 89c395ee794e85a9657b112c4351417850330ef9 | >= 21.7.0, < 22.2.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| 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 |