CVE-2006-5778: ftpd in linux-ftpd 0.17, and possibly other versions, performs a chdir before setting the UID, which allows lo

Routine

MEDIUM 4.6WATCHLISTDOWNGRADE

CVE-2006-5778 is a medium-severity flaw (CVSS 4.6) affecting linux-ftpd-ssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ftpd in linux-ftpd 0.17, and possibly other versions, performs a chdir before setting the UID, which allows local users to bypass intended access restrictions by redirecting their home directory to a restricted directory.

Why this priority

On your watchlist

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

Risk facts

CVSS score	4.6 (Medium)
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Published	2006-11-07
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: linux-ftpd-ssl

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

Am I affected?

Timeline

2006-11-07 18:07 UTCPublished CVE record published
2026-06-16 22:31 UTCUpdated Record last modified

linux-ftpd-ssl linux-ftpd-ssl DOWNGRADE

Affected: 0.17

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.17

1. Check installed version

apt-cache policy linux-ftpd-ssl || rpm -q linux-ftpd-ssl || linux-ftpd-ssl --version

2. No fixed release: DOWNGRADE to a release before 0.17 (Debian / Ubuntu)

apt-cache madison linux-ftpd-ssl sudo apt install linux-ftpd-ssl=<VERSION_BEFORE_0.17> sudo apt-mark hold linux-ftpd-ssl

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

dnf --showduplicates list linux-ftpd-ssl sudo dnf downgrade linux-ftpd-ssl-<VERSION_BEFORE_0.17> sudo dnf versionlock add linux-ftpd-ssl

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-2006-5778?

linux-ftpd-ssl: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-5778 being exploited?

CVE-2006-5778 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-2006-5778 affect?

CVE-2006-5778 affects linux-ftpd-ssl. Severity is medium (CVSS 4.6). ftpd in linux-ftpd 0.17, and possibly other versions, performs a chdir before setting the UID, which allows local users to bypass intended access restrictions by redirecting their home directory to a restricted directory.

How urgent is CVE-2006-5778?

Priority 29/100. On your watchlist

Related CVEs

CVE-2005-3524 HIGH 10.0 DOWNGRADE Buffer overflow in the SSL-ready version of linux-ftpd (linux-ftpd-ssl) 0.17 allows remote attackers to execut

References

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