CVE-2019-12568: Stack-based overflow vulnerability in the logMess function in Open TFTP Server SP 1.66 and earlier allows remo

Q: How do I fix CVE-2019-12568?

open tftp server: upgrade to newer than 1.66. Exact commands for each OS are on this page.

Q: Is CVE-2019-12568 being exploited?

CVE-2019-12568 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-2019-12568 affect?

CVE-2019-12568 affects open tftp server. Severity is critical (CVSS 9.8). Stack-based overflow vulnerability in the logMess function in Open TFTP Server SP 1.66 and earlier allows remote attackers to perform a denial of service or execute arbitrary code via a long TFTP error packet, a different vulnerability than

Q: How urgent is CVE-2019-12568?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2019-12568 is a critical-severity flaw (CVSS 9.8) affecting open tftp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based overflow vulnerability in the logMess function in Open TFTP Server SP 1.66 and earlier allows remote attackers to perform a denial of service or execute arbitrary code via a long TFTP error packet, a different vulnerability than CVE-2018-10387 and CVE-2019-12567.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-787
Published	2019-12-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: open tftp server project

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

Am I affected?

Timeline

2019-12-23 23:15 UTCPublished CVE record published
2026-06-17 02:14 UTCUpdated Record last modified

open tftp server project open tftp server UPGRADE

Affected: <= 1.66

Fixed in: newer than 1.66

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.66 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade open-tftp-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade open-tftp-server

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-2019-12568?

open tftp server: upgrade to newer than 1.66. Exact commands for each OS are on this page.

Is CVE-2019-12568 being exploited?

CVE-2019-12568 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-2019-12568 affect?

CVE-2019-12568 affects open tftp server. Severity is critical (CVSS 9.8). Stack-based overflow vulnerability in the logMess function in Open TFTP Server SP 1.66 and earlier allows remote attackers to perform a denial of service or execute arbitrary code via a long TFTP error packet, a different vulnerability than

How urgent is CVE-2019-12568?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-26130 HIGH 7.8 DOWNGRADE Issues were discovered in Open TFTP Server multithreaded 1.66 and Open TFTP Server single port 1.66
CVE-2019-12567 CRITICAL 9.8 UPGRADE Stack-based overflow vulnerability in the logMess function in Open TFTP Server MT 1.65 and earlier allows remo
CVE-2018-10389 CRITICAL 9.8 UPGRADE Format string vulnerability in the logMess function in TFTP Server MT 1.65 and earlier allows remote attackers
CVE-2018-10388 CRITICAL 9.8 UPGRADE Format string vulnerability in the logMess function in TFTP Server SP 1.66 and earlier allows remote attackers
CVE-2018-10387 CRITICAL 9.8 UPGRADE Heap-based overflow vulnerability in TFTP Server SP 1.66 and earlier allows remote attackers to perform a deni

References

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