What is CVE-2017-17815?

CVE-2017-17815 is a medium-severity vulnerability in Nasm Netwide Assembler, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 5.5/10. Published 2017-12-21.

How severe is CVE-2017-17815?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Nasm Netwide Assembler

CVE-2017-17815

In Netwide Assembler (NASM) 2.14rc0, there is an illegal address access in is_mmacro() in asm/preproc.c that will cause a remote denial of service attack, because of a missing check for the relationship between minimum and maximum parameter counts.

Published 2017-12-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.015 (72.4th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Nasm Netwide Assembler — versions 2.14
Canonical Ubuntu Linux — versions 14.04

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

repo.or.cz/nasm.git/commit/c9244eaadd05b27637cde06021bac3fa1d920aa3 (Patch, Vendor Advisory)
usn.ubuntu.com/3694-1/ (vendor-advisory, Third Party Advisory)
bugzilla.nasm.us/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2017-17815?: CVE-2017-17815 is a medium-severity vulnerability in Nasm Netwide Assembler, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 5.5/10. Published 2017-12-21.
How severe is CVE-2017-17815?: Medium severity. CVSS v3 base score is 5.5 out of 10.