---
cve: "CVE-2022-21716"
severity: "HIGH"
cvss: 7.5
epss: "3.5%"
vendor: "twisted"
kev: false
exploited: false
published: "2022-03-03 21:15:07"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T09:30:20+02:00"
---

# CVE-2022-21716

> 7.5 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 89c395ee794e85a9657b112c4351417850330ef9 (Commit)

## Referenzen

- <https://github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgx>
- <https://github.com/twisted/twisted/commit/89c395ee794e85a9657b112c4351417850330ef9>
- <https://github.com/twisted/twisted/releases/tag/twisted-22.2.0>
- <https://twistedmatrix.com/trac/ticket/10284>
- <https://lists.debian.org/debian-lts-announce/2022/03/msg00009.html>
- <https://www.oracle.com/security-alerts/cpuapr2022.html>
- <https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHPHGGNKMAG6/>
- <https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRYLFBD2YW5K/>
- <https://security.gentoo.org/glsa/202301-02>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2022-21716) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_