Unauthenticated code execution via unchecked @F506 copy
Published Aug 5, 2025 · Updated May 14, 2026
Stack-based buffer overflow in ActFax Server 5.01 allows remote attackers to execute arbitrary code through a crafted RAW fax job. The RAW protocol handler copies user-controlled @F506 fax-header data with strcpy into a fixed-size stack buffer without length validation. Access to TCP port 4559 is sufficient and requires no authentication; successful exploitation runs code in the server process.
Summary
What happened
Stack-based buffer overflow in ActFax Server 5.01 allows remote attackers to execute arbitrary code through a crafted RAW fax job. The RAW protocol handler copies user-controlled @F506 fax-header data with strcpy into a fixed-size stack buffer without length validation. Access to TCP port 4559 is sufficient and requires no authentication; successful exploitation runs code in the server process.
The record
- CVE
- CVE-2013-10064
- Published
- Aug 5, 2025
- Updated
- May 14, 2026
- Vendor
- ActFax Communication-Software GmbH
- Product
- ActFax Server
- Classifications
- CWE-121, CAPEC-100, T1210
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 5, 2025CVE publishedPublication date reported by the CVE source.
- May 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.01
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- ActFax 5.01 RAW Server Buffer Overflow Metasploit modulefunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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