CVE-2000-0640: Guild FTPd allows remote attackers to determine the existence of files outside the FTP root via a .

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HIGH 7.5DOWNGRADE

CVE-2000-0640 is a high-severity flaw (CVSS 7.5) affecting guildftpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Guild FTPd allows remote attackers to determine the existence of files outside the FTP root via a .. (dot dot) attack, which provides different error messages depending on whether the file exists or not.

Why this priority

High severity
EPSS top 6%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	7.2% (top 6%)
CISA exploited list	No
Published	2000-07-08
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: steve poulsen

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

Am I affected?

Timeline

2000-07-08 04:00 UTCPublished CVE record published
2026-06-16 21:52 UTCUpdated Record last modified

steve poulsen guildftpd DOWNGRADE

Affected: 0.9.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.9.7 (Debian / Ubuntu)

apt-cache madison guildftpd sudo apt install guildftpd=<VERSION_BEFORE_0.9.7> sudo apt-mark hold guildftpd

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

dnf --showduplicates list guildftpd sudo dnf downgrade guildftpd-<VERSION_BEFORE_0.9.7> sudo dnf versionlock add guildftpd

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: DrPhibez and Nitro187 Guild FTPD 0.9.7 - File Existence Disclosure

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-2000-0640?

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

Is CVE-2000-0640 being exploited?

CVE-2000-0640 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-2000-0640 affect?

CVE-2000-0640 affects guildftpd. Severity is high (CVSS 7.5). Guild FTPd allows remote attackers to determine the existence of files outside the FTP root via a .. (dot dot) attack, which provides different error messages depending on whether the file exists or not.

How urgent is CVE-2000-0640?

Priority 55/100. High severity; EPSS top 6%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2008-4572 HIGH 10.0 DOWNGRADE GuildFTPd 0.999.14, and possibly other versions, allows remote attackers to cause a denial of service (crash)
CVE-2006-5133 HIGH 7.5 DOWNGRADE Buffer overflow in GuildFTPd 0.999.13 allows remote attackers to have an unknown impact, possibly code executi
CVE-2003-1267 MEDIUM 5.0 DOWNGRADE GuildFTPd 0.999 allows remote attackers to cause a denial of service (crash) via a GET request for MS-DOS devi
CVE-2001-0770 HIGH 7.5 DOWNGRADE Buffer overflow in GuildFTPd Server 0.97 allows remote attacker to execute arbitrary code via a long SITE comm
CVE-2001-0769 MEDIUM 5.0 DOWNGRADE Memory leak in GuildFTPd Server 0.97 allows remote attackers to cause a denial of service via a request contai

References

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