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Fencer Vulns
high 7.5

CVE-2017-17818 json

In Netwide Assembler (NASM) 2.14rc0, there is a heap-based buffer over-read that will cause a remote denial of service attack, related to a…

published 2017-12-21 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-8969

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

In Netwide Assembler (NASM) 2.14rc0, there is a heap-based buffer over-read that will cause a remote denial of service attack, related to a while loop in paste_tokens in asm/preproc.c.

Patch / fix

  • nasm Debian 14, Debian 13, Debian 12 2.13.02-0.1

debian advisories DEBIAN-CVE-2017-17818

  • nasm Ubuntu 14.04 LTS 2.10.09-1ubuntu0.1
  • nasm Ubuntu 16.04 LTS 2.11.08-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2017-17818

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nasm SLE Software Development Kit 12 SP5 2.14.02-4.8.1
  • firefox-atk SLES 11 SP4-LTSS 2.26.1-2.8.4
  • mozilla-nss SLES 11 SP4-LTSS 3.45-38.9.3
  • firefox-gtk3 SLES 11 SP4-LTSS 3.10.9-2.15.3
  • mozilla-nspr SLES 11 SP4-LTSS 4.21-29.6.1
  • firefox-cairo SLES 11 SP4-LTSS 1.15.10-2.13.4
  • firefox-glib2 SLES 11 SP4-LTSS 2.54.3-2.14.7
  • firefox-pango SLES 11 SP4-LTSS 1.40.14-2.7.4

suse advisories SUSE-SU-2020:1864-1SUSE-SU-2019:14246-1

  • nasm openSUSE Tumbleweed 2.15.05-1.6

opensuse advisories openSUSE-SU-2024:11075-1

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-2017-17818 updated cvss 3.3

nasm: Heap-based buffer over-read in paste_tokens function in asm/preproc.c

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

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

Exploit prediction

2.72% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.nasm.us https://bugzilla.nasm.us/show_bug.cgi?id=3392428 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/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.