CVE-2018-17106: In Tinyftp Tinyftpd 1.1, a buffer overflow exists in the text variable of the do_mkd function in the ftpproto.

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HIGH 7.5REMOTEDOWNGRADE

CVE-2018-17106 is a high-severity flaw (CVSS 7.5) affecting tinyftp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Tinyftp Tinyftpd 1.1, a buffer overflow exists in the text variable of the do_mkd function in the ftpproto.c file. An attacker can overwrite ebp via a long pathname.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-119
Published	2018-09-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: tinyftp project

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

Am I affected?

Timeline

2018-09-16 21:29 UTCPublished CVE record published
2026-06-17 01:45 UTCUpdated Record last modified

tinyftp project tinyftp 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 tinyftp || rpm -q tinyftp || tinyftp --version

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

apt-cache madison tinyftp sudo apt install tinyftp=<VERSION_BEFORE_1.1> sudo apt-mark hold tinyftp

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

dnf --showduplicates list tinyftp sudo dnf downgrade tinyftp-<VERSION_BEFORE_1.1> sudo dnf versionlock add tinyftp

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-2018-17106?

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

Is CVE-2018-17106 being exploited?

CVE-2018-17106 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-2018-17106 affect?

CVE-2018-17106 affects tinyftp. Severity is high (CVSS 7.5). In Tinyftp Tinyftpd 1.1, a buffer overflow exists in the text variable of the do_mkd function in the ftpproto.c file. An attacker can overwrite ebp via a long pathname.

How urgent is CVE-2018-17106?

Priority 52/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-0541 CRITICAL 9.8 DOWNGRADE Buffer overflow in Tiny FTP Daemon Ver0.52d allows an attacker to cause a denial-of-service (DoS) condition or

References

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