CVE-2011-0507: FTPService.exe in Blackmoon FTP 3.1 Build 1735 and Build 1736 (3.1.7.1736), and possibly other versions before

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MEDIUM 4.3DOWNGRADE

CVE-2011-0507 is a medium-severity flaw (CVSS 4.3) affecting blackmoon ftp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FTPService.exe in Blackmoon FTP 3.1 Build 1735 and Build 1736 (3.1.7.1736), and possibly other versions before 3.1.8.1737, allows remote attackers to cause a denial of service (crash) via a large number of PORT commands with long arguments, which triggers a NULL pointer dereference. NOTE: some of these details are obtained from third party information.

Why this priority

EPSS top 8%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	4.9% (top 8%)
CISA exploited list	No
Published	2011-01-20
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: blackmoonftpserver

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

Am I affected?

Timeline

2011-01-20 19:00 UTCPublished CVE record published
2026-06-16 23:27 UTCUpdated Record last modified

blackmoonftpserver blackmoon ftp server DOWNGRADE

Affected: 3.1 · 3.1.7.1735 · 3.1.7.1736

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1

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 3.1 (Debian / Ubuntu)

apt-cache madison blackmoon-ftp-server sudo apt install blackmoon-ftp-server=<VERSION_BEFORE_3.1> 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_3.1> 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.

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: Blackmoon FTP 3.1 Build 1735/1736 - 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-2011-0507?

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

Is CVE-2011-0507 being exploited?

CVE-2011-0507 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-2011-0507 affect?

CVE-2011-0507 affects blackmoon ftp server. Severity is medium (CVSS 4.3). FTPService.exe in Blackmoon FTP 3.1 Build 1735 and Build 1736 (3.1.7.1736), and possibly other versions before 3.1.8.1737, allows remote attackers to cause a denial of service (crash) via a large number of PORT commands with long arguments,

How urgent is CVE-2011-0507?

Priority 43/100. EPSS top 8%: very likely to be exploited; Public exploit reference

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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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