Race condition in the FTPHandler class in ftpserver.py in pyftpdlib before 0.5.2 allows…
Priority LOW 24CWE-362Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Medium
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- Fixed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and GitHub.
Summary
Race condition in the FTPHandler class in ftpserver.py in pyftpdlib before 0.5.2 allows remote attackers to cause a denial of service (daemon outage) by establishing and then immediately closing a TCP connection, leading to the accept function having an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, a related issue to CVE-2010-3492.
Why it matters now
EPSS 0.02294 83rd percentileScored 2026-11-07
Fix Fixed pyftpdlib (PyPI): 0.5.2
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | pyftpdlib (PyPI) | before 0.5.2 | 0.5.2 | Patch available | GHSA-hw4g-fhcp-x5mq |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- pyftpdlib (PyPI) Vendor— Affected before 0.5.2 Fixed in 0.5.2 Patch available GHSA-hw4g-fhcp-x5mq
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:g.rodola:pyftpdlib:*:*:*:*:*:*:*:* | up to 0.5.1 | Vulnerable | G.rodola |
| cpe:2.3:a:g.rodola:pyftpdlib:0.1:*:*:*:*:*:*:* | 0.1 | Vulnerable | G.rodola |
| cpe:2.3:a:g.rodola:pyftpdlib:0.1.1:*:*:*:*:*:*:* | 0.1.1 | Vulnerable | G.rodola |
| cpe:2.3:a:g.rodola:pyftpdlib:0.2.0:*:*:*:*:*:*:* | 0.2.0 | Vulnerable | G.rodola |
| cpe:2.3:a:g.rodola:pyftpdlib:0.3.0:*:*:*:*:*:*:* | 0.3.0 | Vulnerable | G.rodola |
| cpe:2.3:a:g.rodola:pyftpdlib:0.4.0:*:*:*:*:*:*:* | 0.4.0 | Vulnerable | G.rodola |
| cpe:2.3:a:g.rodola:pyftpdlib:0.5.0:*:*:*:*:*:*:* | 0.5.0 | Vulnerable | G.rodola |
- cpe:2.3:a:g.rodola:pyftpdlib:*:*:*:*:*:*:*:* Versions up to 0.5.1 Vulnerable ·G.rodola
- cpe:2.3:a:g.rodola:pyftpdlib:0.1:*:*:*:*:*:*:* Versions 0.1 Vulnerable ·G.rodola
- cpe:2.3:a:g.rodola:pyftpdlib:0.1.1:*:*:*:*:*:*:* Versions 0.1.1 Vulnerable ·G.rodola
- cpe:2.3:a:g.rodola:pyftpdlib:0.2.0:*:*:*:*:*:*:* Versions 0.2.0 Vulnerable ·G.rodola
- cpe:2.3:a:g.rodola:pyftpdlib:0.3.0:*:*:*:*:*:*:* Versions 0.3.0 Vulnerable ·G.rodola
- cpe:2.3:a:g.rodola:pyftpdlib:0.4.0:*:*:*:*:*:*:* Versions 0.4.0 Vulnerable ·G.rodola
- cpe:2.3:a:g.rodola:pyftpdlib:0.5.0:*:*:*:*:*:*:* Versions 0.5.0 Vulnerable ·G.rodola
Remediation
- Fix · GHSA-hw4g-fhcp-x5mq pyftpdlib (PyPI) Fixed in 0.5.2 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2010-3494
- 2026-10-03 Alias added: GHSA-hw4g-fhcp-x5mq
References
Advisory 2
Other 12
- [oss-security] 20100910 Re: CVE Request -- Python -- accept() implementation in async core is broken => more subcases
- http://code.google.com/p/pyftpdlib/source/detail?r=556
- http://code.google.com/p/pyftpdlib/source/browse/trunk/HISTORY
- https://bugs.launchpad.net/zodb/+bug/135108
- http://code.google.com/p/pyftpdlib/source/diff?spec=svn556&r=556&format=side&path=/trunk/pyftpdlib/ftpserver.py
- http://code.google.com/p/pyftpdlib/issues/detail?id=105
- [oss-security] 20100924 Re: CVE Request -- Python -- accept() implementation in async core is broken => more subcases
- [oss-security] 20100922 Re: CVE Request -- Python -- accept() implementation in async core is broken => more subcases
- http://code.google.com/p/pyftpdlib/issues/detail?id=104
- [oss-security] 20100909 CVE Request -- Python -- accept() implementation in async core is broken => more subcases
- https://github.com/giampaolo/pyftpdlib
- https://github.com/pypa/advisory-database/tree/main/vulns/pyftpdlib/PYSEC-2010-11.yaml
More G.rodola Pyftpdlib vulnerabilities
- TI-2007-06431 FTPServer.py in pyftpdlib before 0.2.0 does not increment the attempted_logins count for… CVSS 2.0HIGH 7.5
- TI-2008-06949 ftpserver.py in pyftpdlib before 0.5.0 does not delay its response after receiving an… CVSS 2.0HIGH 7.5
- TI-2008-06948 Multiple directory traversal vulnerabilities in FTPServer.py in pyftpdlib before 0.3.0… CVSS 2.0MEDIUM 6.5
- TI-2007-06430 Multiple directory traversal vulnerabilities in FTPServer.py in pyftpdlib before 0.2.0… CVSS 2.0MEDIUM 6.5
- TI-2007-06435 The ftp_PORT function in FTPServer.py in pyftpdlib before 0.2.0 does not prevent TCP… CVSS 2.0MEDIUM 6.5
- TI-2007-06433 FTPServer.py in pyftpdlib before 0.2.0 allows remote attackers to cause a denial of service via a long command. CVSS 2.0MEDIUM 5.0
Sources
- CVE-2010-3494 · CVE Program
- CVE-2010-3494 · NVD
- FIRST EPSS
- GHSA-hw4g-fhcp-x5mq · GitHub Advisory Database · CC BY 4.0
- CVE-2010-3494 · Red Hat security data · CC BY 4.0
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