CVE-2006-3952: Stack-based buffer overflow in EFS Software Easy File Sharing FTP Server 2.0 allows remote attackers to execut

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HIGH 7.5DOWNGRADE

CVE-2006-3952 is a high-severity flaw (CVSS 7.5) affecting efs ftp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow in EFS Software Easy File Sharing FTP Server 2.0 allows remote attackers to execute arbitrary code via a long argument to the PASS command. NOTE: the provenance of this information is unknown; the details are obtained from third party information.

Why this priority

High severity
EPSS top 1%: 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	66.8% (top 1%)
CISA exploited list	No
Published	2006-08-01
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: efs software

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

Am I affected?

Timeline

2006-08-01 21:04 UTCPublished CVE record published
2026-06-16 22:28 UTCUpdated Record last modified

efs software efs 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 efs-ftp-server || rpm -q efs-ftp-server || efs-ftp-server --version

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

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

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

dnf --showduplicates list efs-ftp-server sudo dnf downgrade efs-ftp-server-<VERSION_BEFORE_2.0> sudo dnf versionlock add efs-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: Easy File Sharing FTP Server 2.0 (Windows 2000 SP4) - 'PASS' Remote Overflow
Exploit-DB: Easy File Sharing FTP Server 2.0 - 'PASS' Remote
Exploit-DB: Easy File Sharing FTP Server 2.0 - PASS Overflow (Metasploit)
Exploit-DB: Easy File Sharing FTP Server 3.5 - Remote Stack Buffer Overflow
Metasploit: Easy File Sharing FTP Server 2.0 PASS Overflow

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-2006-3952?

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

Is CVE-2006-3952 being exploited?

CVE-2006-3952 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-2006-3952 affect?

CVE-2006-3952 affects efs ftp server. Severity is high (CVSS 7.5). Stack-based buffer overflow in EFS Software Easy File Sharing FTP Server 2.0 allows remote attackers to execute arbitrary code via a long argument to the PASS command. NOTE: the provenance of this information is unknown; the details are ob

How urgent is CVE-2006-3952?

Priority 56/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference

References

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