What is CVE-2018-10388?

CVE-2018-10388 is a critical-severity vulnerability in Open Tftp Server Project, classified under Use of Externally-Controlled Format String. CVSS score: 9.8/10. Published 2019-12-23.

How severe is CVE-2018-10388?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2018-10388 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Open Tftp Server Project

CVE-2018-10388

Format string vulnerability in the logMess function in TFTP Server SP 1.66 and earlier allows remote attackers to perform a denial of service or execute arbitrary code via format string sequences in a TFTP error packet.

Published 2019-12-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.044 (90.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.044 · newest: 0.044 · change: 0.000

Affected products

Open Tftp Server Project

Weakness classification (CWE)

CWE-134 — Use of Externally-Controlled Format String

Public proof-of-concept exploits

References

sourceforge.net/p/tftp-server/discussion/550564/thread/a586ce62/ (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-10388?: CVE-2018-10388 is a critical-severity vulnerability in Open Tftp Server Project, classified under Use of Externally-Controlled Format String. CVSS score: 9.8/10. Published 2019-12-23.
How severe is CVE-2018-10388?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2018-10388 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.