CVE-2021-45256

nasm: Null pointer dereference via asm/preproc.c

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Severity

Low

Red Hat Product Security

3.3

CVSS 3.1

Review impact separately from score.

Published · December 22, 2021

Updated · November 21, 2025

Description

A null-pointer dereference flaw was found in nasm's preproc.c. An attacker with local network access could pass specially crafted unknown input causing an application to halt or crash, leading to a denial of service.

Statement

This issue does not affect the versions of NASM as shipped with Red Hat Enterprise Linux 6, 7, 8 and 9 as they do not include the vulnerable function in their source code.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 3.3
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CWE-476 · NULL Pointer Dereference