7.8

CVE-2021-23180: htmldoc_project htmldoc NULL Pointer Dereference

Modified
AliasesUBUNTU-CVE-2021-23180USN-5198-1DEBIAN-CVE-2021-23180
Published 02-03-2022Last modified 03-08-2024

Vulnerability summary

CVE-2021-23180 is a high (CVSS 7.8) NULL Pointer Dereference vulnerability in htmldoc_project htmldoc. EPSS estimates a 1.35% chance of exploitation in the next 30 days, higher than 71.3% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
41/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
1.35%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 3
DLA-2700-1DSA-4928-1MGASA-2021-0332

Timeline

  1. 02-03-2022
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

A flaw was found in htmldoc in v1.9.12 and before. Null pointer dereference in file_extension(),in file.c may lead to execute arbitrary code and denial of service.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.35%

Chance of exploitation in the next 30 days

Percentile

71%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.35% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Htmldoc

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • htmldoc< 1.9.11-4
Htmldoc_project1 product
Ubuntu1 product
  • htmldocAll versions (No fix recorded) | < 1.9.7-1ubuntu0.2

3 vendors · 3 products

References

7 links