What is CVE-2023-38665?

CVE-2023-38665 is a medium-severity vulnerability in Nasm Netwide Assembler, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2023-08-22.

How severe is CVE-2023-38665?

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

NULL pointer dereference in Nasm Netwide Assembler

CVE-2023-38665

Null pointer dereference in ieee_write_file in nasm 2.16rc0 allows attackers to cause a denial of service (crash).

Published 2023-08-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (21.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Nasm Netwide Assembler — versions 2.16

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

bugzilla.nasm.us/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2023-38665?: CVE-2023-38665 is a medium-severity vulnerability in Nasm Netwide Assembler, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2023-08-22.
How severe is CVE-2023-38665?: Medium severity. CVSS v3 base score is 5.5 out of 10.