5.5

CVE-2021-45256: nasm netwide_assembler NULL Pointer Dereference

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2021-45256DEBIAN-CVE-2021-45256
Published 22-12-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-45256 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in nasm netwide_assembler. EPSS estimates a 0.69% chance of exploitation in the next 30 days, higher than 51.9% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.69%
0%100%
Low · +0.08 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 22-12-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

A Null Pointer Dereference vulnerability existfs in nasm 2.16rc0 via asm/preproc.c.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.69%

Chance of exploitation in the next 30 days

Percentile

52%

Versus all other CVEs

30-day change

+0.08 pp

From 0.61% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.69%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • nasmAll versions (No fix recorded)
Nasm1 product
Ubuntu1 product
  • nasmAll versions (No fix recorded)

3 vendors · 3 products

References

4 links