An issue in AsyncSSH before 2.14.1 allows attackers to control the extension info message…
Priority MEDIUM 60CWE-345Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-345.
Summary
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."
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00586 48th percentileScored 2026-11-07
Fix Partial asyncssh (PyPI): 2.14.1Red Hat: 3 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | asyncssh (PyPI) | before 2.14.1 | 2.14.1 | Patch available | GHSA-cfc2-wr2v-gxm5 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- asyncssh (PyPI) Vendor— Affected before 2.14.1 Fixed in 2.14.1 Patch available GHSA-cfc2-wr2v-gxm5
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:asyncssh_project:asyncssh:*:*:*:*:*:*:*:* | before 2.14.1 | Vulnerable | Asyncssh Project |
- cpe:2.3:a:asyncssh_project:asyncssh:*:*:*:*:*:*:*:* Versions before 2.14.1 Vulnerable ·Asyncssh Project
Remediation
- Fix · GHSA-cfc2-wr2v-gxm5 asyncssh (PyPI) Fixed in 2.14.1 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ceph Storage 6 | Affected | No fix planned: Will not fix |
| Red Hat Ceph Storage 7 | Affected | No fix yet |
| Red Hat Openshift Data Foundation 4 | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2023-46445
- 2026-10-03 Alias added: GHSA-cfc2-wr2v-gxm5
References
Advisory 4
Other 10
- https://www.terrapin-attack.com
- https://github.com/ronf/asyncssh/blob/develop/docs/changes.rst
- http://packetstormsecurity.com/files/176280/Terrapin-SSH-Connection-Weakening.html
- https://security.netapp.com/advisory/ntap-20231222-0001/
- https://github.com/ronf/asyncssh/commit/83e43f5ea3470a8617fc388c72b062c7136efd7e
- https://github.com/pypa/advisory-database/tree/main/vulns/asyncssh/PYSEC-2023-237.yaml
- https://github.com/ronf/asyncssh
- https://lists.debian.org/debian-lts-announce/2024/09/msg00042.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ME34ROZWMDK5KLMZKTSA422XVJZ7IMTE
- https://security.netapp.com/advisory/ntap-20231222-0001
More Asyncssh Project Asyncssh vulnerabilities
- TI-2026-33108 Path traversal in ronf asyncssh CVSS 4.0HIGH 8.2
- TI-2023-26623 The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6… CVSS 3.1MEDIUM 5.9
- TI-2023-25009 An issue in AsyncSSH before 2.14.1 allows attackers to control the remote end of an SSH… CVSS 3.1MEDIUM 6.8
- TI-2018-05592 The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether… CVSS 3.0CRITICAL 9.8
Sources
- CVE-2023-46445 · CVE Program
- CVE-2023-46445 · NVD
- FIRST EPSS
- GHSA-cfc2-wr2v-gxm5 · GitHub Advisory Database · CC BY 4.0
- CVE-2023-46445 · Red Hat security data · CC BY 4.0
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