CVE-2003-0343: BlackMoon FTP Server 2.6 Free Edition, and possibly other distributions and versions, generates an "Account do

Routine

MEDIUM 4.6DOWNGRADE

CVE-2003-0343 is a medium-severity flaw (CVSS 4.6) affecting blackmoon ftp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

BlackMoon FTP Server 2.6 Free Edition, and possibly other distributions and versions, generates an "Account does not exist" error message when an invalid username is entered, which makes it easier for remote attackers to conduct brute force attacks.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.6 (Medium)
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Published	2003-05-21
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: selom ofori

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

Am I affected?

Timeline

2003-05-21 04:00 UTCPublished CVE record published
2026-06-16 22:02 UTCUpdated Record last modified

selom ofori blackmoon ftp server 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 blackmoon-ftp-server || rpm -q blackmoon-ftp-server || blackmoon-ftp-server --version

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

apt-cache madison blackmoon-ftp-server sudo apt install blackmoon-ftp-server=<VERSION_BEFORE_2.6> sudo apt-mark hold blackmoon-ftp-server

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

dnf --showduplicates list blackmoon-ftp-server sudo dnf downgrade blackmoon-ftp-server-<VERSION_BEFORE_2.6> sudo dnf versionlock add blackmoon-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-2003-0343?

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

Is CVE-2003-0343 being exploited?

CVE-2003-0343 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-2003-0343 affect?

CVE-2003-0343 affects blackmoon ftp server. Severity is medium (CVSS 4.6). BlackMoon FTP Server 2.6 Free Edition, and possibly other distributions and versions, generates an "Account does not exist" error message when an invalid username is entered, which makes it easier for remote attackers to conduct brute force

How urgent is CVE-2003-0343?

Priority 26/100. No elevated risk signals yet.

Related CVEs

CVE-2011-0507 MEDIUM 4.3 DOWNGRADE FTPService.exe in Blackmoon FTP 3.1 Build 1735 and Build 1736 (3.1.7.1736), and possibly other versions before
CVE-2003-0342 MEDIUM 4.6 DOWNGRADE BlackMoon FTP Server 2.6 Free Edition, and possibly other distributions and versions, stores user names and pa
CVE-2002-0126 HIGH 7.5 DOWNGRADE Buffer overflow in BlackMoon FTP Server 1.0 through 1.5 allows remote attackers to execute arbitrary code via

References

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