CVE-1999-1514: Buffer overflow in Celtech ExpressFS FTP server 2.x allows remote attackers to cause a denial of service, and

This month

HIGH 7.5DOWNGRADE

CVE-1999-1514 is a high-severity flaw (CVSS 7.5) affecting expressfs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in Celtech ExpressFS FTP server 2.x allows remote attackers to cause a denial of service, and possibly execute arbitrary commands, via a long USER command.

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	3.5% (top 11%)
CISA exploited list	No
Published	2001-11-28
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: celtech software

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2001-11-28 05:00 UTCPublished CVE record published
2026-06-16 21:50 UTCUpdated Record last modified

celtech software expressfs DOWNGRADE

Affected: 2.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.6

1. Check installed version

apt-cache policy expressfs || rpm -q expressfs || expressfs --version

2. No fixed release: DOWNGRADE to a release before 2.6 (Debian / Ubuntu)

apt-cache madison expressfs sudo apt install expressfs=<VERSION_BEFORE_2.6> sudo apt-mark hold expressfs

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

dnf --showduplicates list expressfs sudo dnf downgrade expressfs-<VERSION_BEFORE_2.6> sudo dnf versionlock add expressfs

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-1999-1514?

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

Is CVE-1999-1514 being exploited?

CVE-1999-1514 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-1999-1514 affect?

CVE-1999-1514 affects expressfs. Severity is high (CVSS 7.5). Buffer overflow in Celtech ExpressFS FTP server 2.x allows remote attackers to cause a denial of service, and possibly execute arbitrary commands, via a long USER command.

How urgent is CVE-1999-1514?

Priority 49/100. High severity

References

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