# CVE-2018-7749: AsyncSSH SSH Server Authentication Bypass

Source: https://junglewise.ai/threats/cve-2018-7749-asyncssh-ssh-server-authentication-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2018-03-12  
License: CC BY 4.0 with a link back

CVE-2018-7749 · Severity: low · CVSS 3.1 · Published 2018-03-12

The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.

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

## Quick answers

**Is CVE-2018-7749 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2018-7749 being exploited in the wild.

**How severe is CVE-2018-7749?** Low severity, with a CVSS score of 3.1, published 12 March 2018.

**Which products and versions are affected?** asyncssh (PyPI) ECOSYSTEM:introduced=0,fixed=1.12.1, GIT:introduced=0,fixed=c161e26cdc0d41b745b63d9f17b437f073bf7ba4|ECOSYSTEM:introduced=0,fixed=1.12.1.

**Is there a fix for CVE-2018-7749?** Yes. asyncssh (PyPI): upgrade to 1.12.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2018-7749?** 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 1.12.1 or later

  ```sh
  pip install "asyncssh>=1.12.1"
  ```


## Affected products

- asyncssh (PyPI) ECOSYSTEM:introduced=0,fixed=1.12.1, GIT:introduced=0,fixed=c161e26cdc0d41b745b63d9f17b437f073bf7ba4|ECOSYSTEM:introduced=0,fixed=1.12.1

## Identifiers

- CVE-2018-7749
- GHSA-97cv-6pjf-5f9q
- PYSEC-2018-108

## 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)