CVE-2006-4781: Heap-based buffer overflow in FutureSoft TFTP Server Multithreaded (MT) 1.1 allows remote attackers to cause a

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HIGH 7.5DOWNGRADE

CVE-2006-4781 is a high-severity flaw (CVSS 7.5) affecting tftp server multithreaded. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in FutureSoft TFTP Server Multithreaded (MT) 1.1 allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code by sending a crafted packet to port 69/UDP, which triggers the overflow when constructing an absolute path name. NOTE: Some details are obtained from third party information.

Why this priority

High severity
EPSS top 7%: 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	5.8% (top 7%)
CISA exploited list	No
Published	2006-09-14
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: futuresoft

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

Am I affected?

Timeline

2006-09-14 10:07 UTCPublished CVE record published
2026-06-16 22:29 UTCUpdated Record last modified

futuresoft tftp server multithreaded DOWNGRADE

Affected: 1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1

1. Check installed version

apt-cache policy tftp-server-multithreaded || rpm -q tftp-server-multithreaded || tftp-server-multithreaded --version

2. No fixed release: DOWNGRADE to a release before 1.1 (Debian / Ubuntu)

apt-cache madison tftp-server-multithreaded sudo apt install tftp-server-multithreaded=<VERSION_BEFORE_1.1> sudo apt-mark hold tftp-server-multithreaded

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

dnf --showduplicates list tftp-server-multithreaded sudo dnf downgrade tftp-server-multithreaded-<VERSION_BEFORE_1.1> sudo dnf versionlock add tftp-server-multithreaded

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: Multi-Threaded TFTP 1.1 - GET 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-2006-4781?

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

Is CVE-2006-4781 being exploited?

CVE-2006-4781 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-2006-4781 affect?

CVE-2006-4781 affects tftp server multithreaded. Severity is high (CVSS 7.5). Heap-based buffer overflow in FutureSoft TFTP Server Multithreaded (MT) 1.1 allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code by sending a crafted packet to port 69/UDP, which triggers the overf

How urgent is CVE-2006-4781?

Priority 55/100. High severity; EPSS top 7%: very likely to be exploited; Public exploit reference

References

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