CVE-2022-21716

⚠️ high

Summary

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 Score

7.5

High

EPSS Score

1.0

Exploit Probability

Published Date

2022-03-03

First Seen: 2026-01-05

📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 69.0% of all 328,009 vulnerabilities in our database.

#101,817

Above average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: Apr 22, 2025

🔍 Exploitation Status

Poc

Proof-of-concept available

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Partial

Limited system impact

SSVC data provided by CISA

Last Modified 2024-11-25

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-120 CWE-770

📦 Affected Products 7

Vendor	Product	Status	Affected Versions
debian	debian_linux	Affected	v9.0
oracle	http_server	Affected	v12.2.1.3.0
oracle	http_server	Affected	v12.2.1.4.0
fedoraproject	fedora	Affected	v35
fedoraproject	fedora	Affected	v36
oracle	zfs_storage_appliance_kit	Affected	v8.8
twisted	twisted	Affected	≥ 21.7.0 < 22.2.0

🔗 References 9

https://github.com/twisted/twisted/commit/89c395ee79...

Patch Third Party Advisory

https://github.com/twisted/twisted/releases/tag/twis...

Release Notes Third Party Advisory

https://github.com/twisted/twisted/security/advisori...

Exploit Patch Third Party Advisory

https://lists.debian.org/debian-lts-announce/2022/03...

Mailing List Third Party Advisory

https://lists.fedoraproject.org/archives/list/packag...

https://security.gentoo.org/glsa/202301-02

Third Party Advisory

https://twistedmatrix.com/trac/ticket/10284

Issue Tracking Vendor Advisory

https://www.oracle.com/security-alerts/cpuapr2022.html

Patch Third Party Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-49975	⚠️ high	7.5	1.3	Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service vi...	2026-06-08
CVE-2026-42304	⚠️ high	7.5	0.0	Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.4.0rc2, the twisted.n...	2026-05-13
CVE-2026-31431	⚠️ high	7.8	2.2	In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-pla...	2026-04-22
CVE-2026-35093	⚠️ high	8.8	0.0	A flaw was found in libinput. A local attacker who can place a specially crafted Lua bytecode file in certain system or ...	2026-04-01
CVE-2026-35094	ℹ️ low	3.3	0.0	A flaw was found in libinput. An attacker capable of deploying a Lua plugin file in specific system directories can expl...	2026-04-01
CVE-2026-4775	⚠️ high	7.8	0.3	A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerability in the ...	2026-03-24

These CVEs affect the same products