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Vulnerability record · CVE-2022-21716 · published 3 March 2022

CVE-2022-21716: Twisted classic buffer overflow vulnerability

Twisted · Twisted

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.

7.5 CVSS 3.1 High EPSS 3.5% · top 11.2% CWE-120 · Classic buffer overflowCWE-770 · Allocation without limits
7.5CVSS 3.1 base score, v2 5.0
3.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
18References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/twisted/twisted/commit/89c395ee794e85a9657b112c4351417850330ef9 PatchThird Party Advisory
https://github.com/twisted/twisted/releases/tag/twisted-22.2.0 Release NotesThird Party Advisory
https://github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgx ExploitPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00009.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRY
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHP
https://security.gentoo.org/glsa/202301-02 Third Party Advisory
https://twistedmatrix.com/trac/ticket/10284 Issue TrackingVendor Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://github.com/twisted/twisted/commit/89c395ee794e85a9657b112c4351417850330ef9 PatchThird Party Advisory
https://github.com/twisted/twisted/releases/tag/twisted-22.2.0 Release NotesThird Party Advisory
https://github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgx ExploitPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00009.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRY
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHP
https://security.gentoo.org/glsa/202301-02 Third Party Advisory
https://twistedmatrix.com/trac/ticket/10284 Issue TrackingVendor Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2022-21716), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.