CVE-2001-0255: FaSTream FTP++ Server 2.0 allows remote attackers to list arbitrary directories by using the "ls" command and

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MEDIUM 5.0DOWNGRADEDOWNGRADE

CVE-2001-0255 is a medium-severity flaw (CVSS 5.0) affecting fastream ftp\+\+ server, fastream ftp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FaSTream FTP++ Server 2.0 allows remote attackers to list arbitrary directories by using the "ls" command and including the drive letter name (e.g. C:) in the requested pathname.

Why this priority

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	5.0 (Medium)
EPSS exploit chance	7.5% (top 6%)
CISA exploited list	No
Published	2001-06-02
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: fastream

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

Am I affected?

Timeline

2001-06-02 04:00 UTCPublished CVE record published
2026-06-16 21:53 UTCUpdated Record last modified

fastream fastream ftp\+\+ server DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy fastream-ftp++-server || rpm -q fastream-ftp++-server || fastream-ftp++-server --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison fastream-ftp++-server sudo apt install fastream-ftp++-server=<VERSION_BEFORE_2.0> sudo apt-mark hold fastream-ftp++-server

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

dnf --showduplicates list fastream-ftp++-server sudo dnf downgrade fastream-ftp++-server-<VERSION_BEFORE_2.0> sudo dnf versionlock add fastream-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.

fastream fastream ftp server DOWNGRADE

Affected: 2.0beta_11

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0beta_11

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0beta_11 (Debian / Ubuntu)

apt-cache madison fastream-ftp-server sudo apt install fastream-ftp-server=<VERSION_BEFORE_2.0beta_11> sudo apt-mark hold fastream-ftp-server

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

dnf --showduplicates list fastream-ftp-server sudo dnf downgrade fastream-ftp-server-<VERSION_BEFORE_2.0beta_11> sudo dnf versionlock add fastream-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.

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: fastream ftp++ 2.0 - Directory Traversal

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-2001-0255?

fastream ftp\+\+ server: downgrade or apply the listed mitigation; fastream ftp server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2001-0255 being exploited?

CVE-2001-0255 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-2001-0255 affect?

CVE-2001-0255 affects fastream ftp\+\+ server, fastream ftp server. Severity is medium (CVSS 5.0). FaSTream FTP++ Server 2.0 allows remote attackers to list arbitrary directories by using the "ls" command and including the drive letter name (e.g. C:) in the requested pathname.

How urgent is CVE-2001-0255?

Priority 46/100. EPSS top 6%: very likely to be exploited; Public exploit reference

References

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