What is CVE-2017-17819?

CVE-2017-17819 is a medium-severity vulnerability in Nasm Netwide Assembler, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2017-12-21.

How severe is CVE-2017-17819?

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

NULL pointer dereference in Nasm Netwide Assembler

CVE-2017-17819

In Netwide Assembler (NASM) 2.14rc0, there is an illegal address access in the function find_cc() in asm/preproc.c that will cause a remote denial of service attack, because pointers associated with skip_white_ calls are not validated.

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: 0.014 (70.9th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

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

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

bugzilla.nasm.us/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory, Tool Signature)
usn.ubuntu.com/3694-1/ (vendor-advisory, Third Party Advisory)
repo.or.cz/nasm.git/commit/7524cfd91492e6e3719b959498be584a9ced13af (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2017-17819?: CVE-2017-17819 is a medium-severity vulnerability in Nasm Netwide Assembler, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2017-12-21.
How severe is CVE-2017-17819?: Medium severity. CVSS v3 base score is 5.5 out of 10.