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CVE-2019-25681 Xlightftpd CVE debrief

The CVE record for CVE-2019-25681 was published on 2026-04-05T21:16:46.457Z and has not been modified since then. The NVD entry is currently Analyzed. This structured exception handler (SEH) overwrite vulnerability in Xlight FTP Server 3.9.1 allows local attackers to crash the application and overwrite SEH pointers by supplying a crafted buffer string. The vulnerability can be triggered by injecting a 428-byte payload through the program execution field in virtual server configuration, potentially enabling code execution. Users of Xlight FTP Server 3.9.1 should be aware of this vulnerability and take steps to mitigate it.

Vendor
Xlightftpd
Product
Xlight
CVSS
HIGH 8.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-05
Original CVE updated
2026-07-24
Advisory published
2026-04-05
Advisory updated
2026-07-24

Who should care

Users of Xlight FTP Server 3.9.1, system administrators, security teams, and vulnerability management teams should be aware of this vulnerability and take steps to mitigate it. Affected operators and platforms should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Technical summary

CVE-2019-25681 is a structured exception handler (SEH) overwrite vulnerability in Xlight FTP Server 3.9.1. Local attackers can crash the application and overwrite SEH pointers by supplying a crafted buffer string. The vulnerability can be triggered by injecting a 428-byte payload through the program execution field in virtual server configuration, potentially enabling code execution. The vulnerability has a CVSS score of 8.6 and is classified as HIGH severity.

Defensive priority

High

Recommended defensive actions

  • Apply vendor patches or updates
  • Implement compensating controls
  • Monitor for suspicious activity
  • Restrict access to vulnerable systems
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD detail provide information on the vulnerability. Additional sources include Exploit-DB and VulnCheck. The structured exception handler (SEH) overwrite vulnerability in Xlight FTP Server 3.9.1 allows local attackers to crash the application and overwrite SEH pointers by supplying a crafted buffer string. The vulnerability can be triggered by injecting a 428-byte payload through the program execution field in virtual server configuration, potentially enabling code execution. Evidence limits suggest that further verification is required to confirm affected scope and severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2019-25681 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2019-25681

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2019-25681 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2019-25681

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.