What’s Vulnerable › Vulnerabilities

CVE-2023-46445

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-14 · updated 2026-06-17
• Weakness: CWE-345

Description

An issue in AsyncSSH before 2.14.1 allows attackers to control the extension info message (RFC 8308) via a man-in-the-middle attack, aka a "Rogue Extension Negotiation."

Affected products

• ronf asyncssh: before 2.14.1 — fixed in 2.14.1

How to fix

Upgrade to a fixed version: ronf asyncssh 2.14.1. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/176280/Terrapin-SSH-Connection-Weakening.html
• https://github.com/advisories/GHSA-cfc2-wr2v-gxm5
• https://github.com/ronf/asyncssh/blob/develop/docs/changes.rst
• https://github.com/ronf/asyncssh/security/advisories/GHSA-cfc2-wr2v-gxm5
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ME34ROZWMDK5KLMZKTSA422XVJZ7IMTE/
• https://security.netapp.com/advisory/ntap-20231222-0001/
• https://www.terrapin-attack.com
• http://packetstormsecurity.com/files/176280/Terrapin-SSH-Connection-Weakening.html
• https://github.com/advisories/GHSA-cfc2-wr2v-gxm5
• https://github.com/ronf/asyncssh/blob/develop/docs/changes.rst
• https://github.com/ronf/asyncssh/security/advisories/GHSA-cfc2-wr2v-gxm5
• https://lists.debian.org/debian-lts-announce/2024/09/msg00042.html

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