Security readout for executives and security teams
Plain-English summary
AsyncSSH SSH servers before 1.12.1 could treat an unauthenticated connection as ready for other SSH requests. Any exposed service built on that vulnerable server code may allow access without completing login. The source bundle does not provide CVSS, affected downstream products, or evidence of active exploitation.
Executive priority
Treat as high priority for any exposed AsyncSSH-based server because it affects authentication. If AsyncSSH is only present as a client library or unused dependency, urgency is lower but should still be verified quickly.
Technical view
CVE-2018-7749 is an authentication-state handling flaw in AsyncSSH's server implementation. The server did not properly verify that authentication was complete before processing other requests, allowing a customized SSH client to skip authentication. The vendor release and fix commit indicate AsyncSSH 1.12.1 contains the security fix.
Likely exposure
Exposure is likely limited to applications or services running the AsyncSSH server implementation before 1.12.1, especially if reachable over a network. The bundle does not identify specific downstream products, CPEs, operating systems, or managed services.
Exploitation context
The bundle says a customized SSH client can skip authentication, which implies remote unauthenticated abuse may be possible where vulnerable AsyncSSH servers are exposed. CISA KEV is false, and the provided sources do not establish active exploitation.
Researcher notes
The record lacks CVSS, CWE, CPE, and downstream affected-product data. Analysis should focus on package version, whether server mode is used, and network reachability. Do not assume exploit activity from the bundle alone.
Mitigation direction
- Upgrade AsyncSSH server deployments to 1.12.1 or later.
- Prioritize externally reachable SSH services using AsyncSSH.
- Restrict network access to affected services until upgraded.
- Check vendor and application maintainers for downstream fixed versions.
- Review logs for unexpected unauthenticated or unusual SSH sessions.
Validation and detection
- Inventory Python applications that depend on AsyncSSH.
- Confirm deployed AsyncSSH versions are 1.12.1 or later.
- Identify whether the application uses AsyncSSH server functionality.
- Map internet-facing or partner-facing services using AsyncSSH.
- Review dependency lockfiles and runtime images for old AsyncSSH packages.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2018-7749 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- [asyncssh-announce] 20180310 AsyncSSH 1.12.1 released, with important security fix!CVE reference · mailing-list, x_refsource_MLIST
- https://github.com/ronf/asyncssh/commit/c161e26cdc0d41b745b63d9f17b437f073bf7ba4CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.