CVE-2001-0646: Maxum Rumpus FTP Server 1.3.3 and 2.0.3 dev 3 allows a remote attacker to perform a denial of service (hang) b

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MEDIUM 5.0DOWNGRADE

CVE-2001-0646 is a medium-severity flaw (CVSS 5.0) affecting rumpus ftp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Maxum Rumpus FTP Server 1.3.3 and 2.0.3 dev 3 allows a remote attacker to perform a denial of service (hang) by creating a directory name of a specific length.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	3.2% (top 12%)
CISA exploited list	No
Published	2001-09-20
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: maxum development corporation

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

Am I affected?

Timeline

2001-09-20 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

maxum development corporation rumpus ftp server DOWNGRADE

Affected: 1.3.2 · 1.3.4 · 2.0.3dev

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.3.2 (Debian / Ubuntu)

apt-cache madison rumpus-ftp-server sudo apt install rumpus-ftp-server=<VERSION_BEFORE_1.3.2> sudo apt-mark hold rumpus-ftp-server

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

dnf --showduplicates list rumpus-ftp-server sudo dnf downgrade rumpus-ftp-server-<VERSION_BEFORE_1.3.2> sudo dnf versionlock add rumpus-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: Maxum Rumpus FTP Server 1.3.2/1.3.4/2.0.3 dev - Remote Denial of Service

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-2001-0646?

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

Is CVE-2001-0646 being exploited?

CVE-2001-0646 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-2001-0646 affect?

CVE-2001-0646 affects rumpus ftp server. Severity is medium (CVSS 5.0). Maxum Rumpus FTP Server 1.3.3 and 2.0.3 dev 3 allows a remote attacker to perform a denial of service (hang) by creating a directory name of a specific length.

How urgent is CVE-2001-0646?

Priority 45/100. Public exploit reference

Related CVEs

CVE-2007-0367 MEDIUM 4.6 UPGRADE Rumpus 5.1 and earlier has weak permissions for certain files and directories under /usr/local/Rumpus, includi
CVE-2007-0366 MEDIUM 4.6 UPGRADE Untrusted search path vulnerability in Rumpus 5.1 and earlier allows local users to gain privileges via a modi
CVE-2007-0019 MEDIUM 6.5 UPGRADE Multiple heap-based buffer overflows in rumpusd in Rumpus 5.1 and earlier (1) allow remote authenticated users
CVE-2001-0706 LOW 2.1 DOWNGRADE Maximum Rumpus FTP Server 2.0.3 dev and before allows an attacker to cause a denial of service (crash) via a m
CVE-2001-0644 HIGH 7.5 UPGRADE Maxum Rumpus FTP Server 1.3.3 and 2.0.3 dev 3 stores passwords in plaintext in the "Rumpus User Database" file

References

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