Quick answers
- Is CVE-2019-25681 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2019-25681 being exploited in the wild.
- How severe is CVE-2019-25681?
- High severity, with a CVSS score of 8.4, published 5 April 2026.
- Which products and versions are affected?
- Xlightftpd FTP Server 3.9.1.
- Is there a fix for CVE-2019-25681?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2019-25681 attacked?
- It is attacked with local access, in a network appliance.
- Am I affected by CVE-2019-25681?
- Check whether you run Xlightftpd FTP Server or Xlightftpd Xlight Ftp Server 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.
Technical details
A stack-based buffer overflow exists in Xlight FTP Server 3.9.1 due to improper bounds checking in the 'program execution' field within the virtual server configuration. An attacker with local access to the configuration interface can provide a crafted 428-byte payload that overwrites the Structured Exception Handler (SEH) chain. When an exception is subsequently triggered, the corrupted SEH pointer allows the attacker to redirect execution flow. While the primary impact is a denial-of-service (application crash), the ability to control the SEH chain enables potential arbitrary code execution. A proof-of-concept exploit is publicly available. Newer versions (e.g., 3.9.5) are available, though the advisory specifically identifies 3.9.1 as vulnerable.
Affected products
- Xlightftpd Xlight FTP Server 3.9.1
Timeline
- 2019-02-24: disclosed: Initial discovery and PoC by Logan Whitmire
- 2026-04-05: advisory: NVD/VulnCheck publication of CVE-2019-25681