6.5

CVE-2021-45340: libsixel NULL Pointer Dereference

CVSS: 6.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2021-45340DEBIAN-CVE-2021-45340
Published 25-01-2022Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-45340 is a medium (CVSS 6.5) NULL Pointer Dereference vulnerability in libsixel. EPSS estimates a 0.92% chance of exploitation in the next 30 days, higher than 59.5% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
36/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.92%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 25-01-2022
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

In Libsixel prior to and including v1.10.3, a NULL pointer dereference in the stb_image.h component of libsixel allows attackers to cause a denial of service (DOS) via a crafted PICT file.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.92%

Chance of exploitation in the next 30 days

Percentile

60%

Versus all other CVEs

30-day change

0.00 pp

From 0.92% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.92%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Libsixel

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Debian2 products
  • libsixelAll versions (No fix recorded) | < 1.10.5-1
  • libstbAll versions (No fix recorded)
Libsixel1 product
Ubuntu1 product
  • libsixelAll versions (No fix recorded)

3 vendors · 4 products

References

4 links