# CVE-2023-46445: PYSEC-2023-237 - An issue in AsyncSSH v2.14.0 and earlier allows attackers to control the extension info message (RFC 8308) via a man-in-the-middle attack.

Source: https://junglewise.ai/threats/cve-2023-46445-asyncssh-rogue-extension-negotiation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-11-14  
License: CC BY 4.0 with a link back

CVE-2023-46445 · Severity: low · CVSS 3.1 · Published 2023-11-14

An issue in AsyncSSH v2.14.0 and earlier allows attackers to control the extension info message (RFC 8308) via a man-in-the-middle attack.

Technologies: [asyncssh (PyPI)](https://junglewise.ai/threats/technologies/pypi-asyncssh). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2023-46445 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-46445 being exploited in the wild.

**How severe is CVE-2023-46445?** Low severity, with a CVSS score of 3.1, published 14 November 2023.

**Which products and versions are affected?** asyncssh (PyPI) ECOSYSTEM:introduced=0,fixed=2.14.1.

**Is there a fix for CVE-2023-46445?** Yes. asyncssh (PyPI): upgrade to 2.14.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2023-46445?** Check whether you run asyncssh (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- asyncssh (PyPI): upgrade to 2.14.1 or later

  ```sh
  pip install "asyncssh>=2.14.1"
  ```


## Affected products

- asyncssh (PyPI) ECOSYSTEM:introduced=0,fixed=2.14.1

## Identifiers

- CVE-2023-46445
- GHSA-cfc2-wr2v-gxm5
- PYSEC-2023-237

## Related threats

- [AsyncSSH event-loop infinite loop via zero maximum packet size](https://junglewise.ai/threats/cve-2026-62949-asyncssh-event-loop-infinite-loop-via-zero-maximum-packet-size)
- [ronf AsyncSSH path traversal in AuthorizedKeysFile](https://junglewise.ai/threats/cve-2026-45309-ronf-asyncssh-path-traversal-in-authorizedkeysfile)
- [AsyncSSH path traversal in SCP client](https://junglewise.ai/threats/cve-2026-54591-asyncssh-path-traversal-in-scp-client)
- [ronf AsyncSSH path traversal in AuthorizedKeysFile username substitution](https://junglewise.ai/threats/cve-2026-54590-ronf-asyncssh-path-traversal-in-authorizedkeysfile-username)
- [AsyncSSH vulnerable to Prefix Truncation Attack (a.k.a. Terrapin Attack) against ChaCha20-Poly1305 and Encrypt-then-MAC](https://junglewise.ai/threats/asyncssh-vulnerable-to-prefix-truncation-attack-a-k-a-terrapin-attack-70e933b5)