What is CVE-2019-20352?

CVE-2019-20352 is a high-severity vulnerability in Nasm Netwide Assembler, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2020-01-06.

How severe is CVE-2019-20352?

High severity. CVSS v3 base score is 7.1 out of 10.

Is CVE-2019-20352 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Out-of-bounds Read in Nasm Netwide Assembler

CVE-2019-20352

In Netwide Assembler (NASM) 2.15rc0, a heap-based buffer over-read occurs (via a crafted .asm file) in set_text_free when called from expand_one_smacro in asm/preproc.c.

Vulnerability class: Buffer Overflow

Published 2020-01-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.008 (56.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Nasm Netwide Assembler — versions 2.15

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

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

Frequently asked questions

What is CVE-2019-20352?: CVE-2019-20352 is a high-severity vulnerability in Nasm Netwide Assembler, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2020-01-06.
How severe is CVE-2019-20352?: High severity. CVSS v3 base score is 7.1 out of 10.
Is CVE-2019-20352 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.