CVE-2006-5780: Stack-based buffer overflow in nfsd.exe in XLink Omni-NFS Server 5.2 allows remote attackers to execute arbitr

This week

HIGH 7.5DOWNGRADE

CVE-2006-5780 is a high-severity flaw (CVSS 7.5) affecting omni-nfs server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow in nfsd.exe in XLink Omni-NFS Server 5.2 allows remote attackers to execute arbitrary code via a crafted TCP packet to port 2049 (nfsd), as demonstrated by vd_xlink.pm.

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	63.4% (top 1%)
CISA exploited list	No
Published	2006-11-07
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: xlink technology

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

xlink technology omni-nfs server DOWNGRADE

Affected: 5.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.2

1. Check installed version

apt-cache policy omni-nfs-server || rpm -q omni-nfs-server || omni-nfs-server --version

2. No fixed release: DOWNGRADE to a release before 5.2 (Debian / Ubuntu)

apt-cache madison omni-nfs-server sudo apt install omni-nfs-server=<VERSION_BEFORE_5.2> sudo apt-mark hold omni-nfs-server

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

dnf --showduplicates list omni-nfs-server sudo dnf downgrade omni-nfs-server-<VERSION_BEFORE_5.2> sudo dnf versionlock add omni-nfs-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: Omni-NFS Server - Remote Buffer Overflow (Metasploit)
Exploit-DB: Omni-NFS Server 5.2 - 'nfsd.exe' Remote Stack Overflow (Metasploit)
Metasploit: Omni-NFS Server Buffer 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-2006-5780?

omni-nfs server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-5780 being exploited?

CVE-2006-5780 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-2006-5780 affect?

CVE-2006-5780 affects omni-nfs server. Severity is high (CVSS 7.5). Stack-based buffer overflow in nfsd.exe in XLink Omni-NFS Server 5.2 allows remote attackers to execute arbitrary code via a crafted TCP packet to port 2049 (nfsd), as demonstrated by vd_xlink.pm.

How urgent is CVE-2006-5780?

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

References

← Back to latest CVEs