CVE-2019-25681: Xlight FTP Server 3.9.1 contains a structured exception handler (SEH) overwrite vulnerability that allows loca

Routine

HIGH 8.4DOWNGRADE

CVE-2019-25681 is a high-severity flaw (CVSS 8.4) affecting xlight ftp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Xlight FTP Server 3.9.1 contains a structured exception handler (SEH) overwrite vulnerability that allows local attackers to crash the application and overwrite SEH pointers by supplying a crafted buffer string. Attackers can inject a 428-byte payload through the program execution field in virtual server configuration to trigger a buffer overflow that corrupts the SEH chain and enables potential code execution.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.4 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-04-05
Last modified	2026-07-24

Publisher (CNA): VulnCheck · Vendor: xlightftpd

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-05 21:16 UTCPublished CVE record published
2026-07-24 22:10 UTCUpdated Record last modified

xlightftpd xlight ftp server DOWNGRADE

Affected: 3.9.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.9.1

1. Check installed version

apt-cache policy xlight-ftp-server || rpm -q xlight-ftp-server || xlight-ftp-server --version

2. No fixed release: DOWNGRADE to a release before 3.9.1 (Debian / Ubuntu)

apt-cache madison xlight-ftp-server sudo apt install xlight-ftp-server=<VERSION_BEFORE_3.9.1> sudo apt-mark hold xlight-ftp-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list xlight-ftp-server sudo dnf downgrade xlight-ftp-server-<VERSION_BEFORE_3.9.1> sudo dnf versionlock add xlight-ftp-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-25681?

xlight ftp server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-25681 being exploited?

CVE-2019-25681 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-25681 affect?

CVE-2019-25681 affects xlight ftp server. Severity is high (CVSS 8.4). Xlight FTP Server 3.9.1 contains a structured exception handler (SEH) overwrite vulnerability that allows local attackers to crash the application and overwrite SEH pointers by supplying a crafted buffer string. Attackers can inject a 428-b

How urgent is CVE-2019-25681?

Priority 37/100. High severity; Public exploit reference

References

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