CVE & CISA-KEV Catalog

CVE-2022-21716

HIGHEPSS 88th pctl
7.5
CVSS v3
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.

CWE-120Classic Buffer OverflowCWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available
twistedDebian
Fixed in:20.3.0-7+deb11u1CVE-2022-21716
Fixed in:22.2.0-1CVE-2022-21716
Fixed in:22.2.0-1CVE-2022-21716
Fixed in:22.2.0-1CVE-2022-21716
python-twistedUbuntu
Fixed in:13.2.0-1ubuntu1.2+esm2USN-5354-2
Fixed in:16.0.0-1ubuntu0.4+esm1USN-5354-2
Fixed in:17.9.0-2ubuntu0.3USN-5354-1
python-twisted-binUbuntu
Fixed in:13.2.0-1ubuntu1.2+esm2USN-5354-2
Fixed in:16.0.0-1ubuntu0.4+esm1USN-5354-2
Fixed in:17.9.0-2ubuntu0.3USN-5354-1
python-twisted-webUbuntu
Fixed in:13.2.0-1ubuntu1.2+esm2USN-5354-2
Fixed in:16.0.0-1ubuntu0.4+esm1USN-5354-2
python3-twistedUbuntu
Fixed in:16.0.0-1ubuntu0.4+esm1USN-5354-2
Fixed in:17.9.0-2ubuntu0.3USN-5354-1
Fixed in:18.9.0-11ubuntu0.20.04.2USN-5354-1
Fixed in:22.1.0-2ubuntu2.1USN-5354-2
python3-twisted-binUbuntu
Fixed in:17.9.0-2ubuntu0.3USN-5354-1
Fixed in:18.9.0-11ubuntu0.20.04.2USN-5354-1
twistedUbuntu
Fixed in:13.2.0-1ubuntu1.2+esm2USN-5354-2
Fixed in:16.0.0-1ubuntu0.4+esm1USN-5354-2
Fixed in:17.9.0-2ubuntu0.3USN-5354-1
Fixed in:18.9.0-11ubuntu0.20.04.2USN-5354-1
Fixed in:22.1.0-2ubuntu2.1USN-5354-2

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

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

Exploit Intelligence

3.61%probability of exploitation in 30 days
88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Vendor Advisory1
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CVE-2022-21716 severity badge

Markdown

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-25.