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Fencer Vulns
medium 5.5

CVE-2018-16517 json

asm/labels.c in Netwide Assembler (NASM) is prone to NULL Pointer Dereference, which allows the attacker to cause a denial of service via a…

published 2018-09-06 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-8326

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.5%
EPSS 4.5% chance of exploitation in 30 days, percentile 91%
public exploits
1
Exploit-DB

Summary

asm/labels.c in Netwide Assembler (NASM) is prone to NULL Pointer Dereference, which allows the attacker to cause a denial of service via a crafted file.

Patch / fix

  • nasm Debian 14, Debian 13, Debian 12 2.14-1

debian advisories DEBIAN-CVE-2018-16517

  • nasm SLE Module for Development Tools 15 SP2, SLE Module for Development Tools 15 SP1 2.14.02-3.4.1

suse advisories SUSE-SU-2020:1843-1

  • nasm openSUSE Leap 15.2 2.14.02-lp152.4.3.1
  • nasm openSUSE Leap 15.1 2.14.02-lp151.3.3.1

opensuse advisories openSUSE-SU-2020:0954-1openSUSE-SU-2020:0952-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-16517 updated cvss 2.5

nasm: NULL Pointer Dereference in asm/labels.c

  • Red Hat Enterprise Linux 8 nasm
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 5 nasm Red Hat Enterprise Linux 6 nasm, nasm-rdoff Red Hat Enterprise Linux 7 nasm, nasm-rdoff
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. First public exploit (EDB-46726)

Exploit prediction

4.50% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-46726 Netwide Assembler (NASM) 2.14rc15 - NULL Pointer Dereference (PoC) dos, 2019-04-18
  • bugzilla.nasm.us https://bugzilla.nasm.us/show_bug.cgi?id=3392513 referenced PoC, tagged "exploit" by a source, unverified
  • fakhrizulkifli.github.io https://fakhrizulkifli.github.io/CVE-2018-16517.html referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/152566/Netwide-Assembler-NASM-2.14rc15-Null-Pointer-Dereference.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.