CVE-2013-6809: Format string vulnerability in the client in Tftpd32 before 4.50 allows remote servers to cause a denial of se

Q: How do I fix CVE-2013-6809?

tftpd32: upgrade to newer than 4.00. Exact commands for each OS are on this page.

Q: Is CVE-2013-6809 being exploited?

CVE-2013-6809 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2013-6809 affect?

CVE-2013-6809 affects tftpd32. Severity is medium (CVSS 5.0). Format string vulnerability in the client in Tftpd32 before 4.50 allows remote servers to cause a denial of service (crash) or possibly execute arbitrary code via format string specifiers in the Remote File field.

Q: How urgent is CVE-2013-6809?

Priority 44/100. Public exploit reference

This month

MEDIUM 5.0UPGRADE

CVE-2013-6809 is a medium-severity flaw (CVSS 5.0) affecting tftpd32. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Format string vulnerability in the client in Tftpd32 before 4.50 allows remote servers to cause a denial of service (crash) or possibly execute arbitrary code via format string specifiers in the Remote File field.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-134
Published	2013-12-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: philippe jounin

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2013-12-13 18:55 UTCPublished CVE record published
2026-06-17 00:00 UTCUpdated Record last modified

philippe jounin tftpd32 UPGRADE

Affected: <= 4.00 · 1.0 · 1.1 · 2.0 · 2.1 · 2.2 · 2.11 · 2.21

Fixed in: newer than 4.00

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tftpd32 || rpm -q tftpd32 || tftpd32 --version

2. UPGRADE to newer than 4.00 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tftpd32

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tftpd32

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2013-6809?

tftpd32: upgrade to newer than 4.00. Exact commands for each OS are on this page.

Is CVE-2013-6809 being exploited?

CVE-2013-6809 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-2013-6809 affect?

CVE-2013-6809 affects tftpd32. Severity is medium (CVSS 5.0). Format string vulnerability in the client in Tftpd32 before 4.50 allows remote servers to cause a denial of service (crash) or possibly execute arbitrary code via format string specifiers in the Remote File field.

How urgent is CVE-2013-6809?

Priority 44/100. Public exploit reference

References

← Back to latest CVEs