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No exploitation reportedFix available

CVE-2020-36403

No exploitation reported by the sources we read.

  • Published2021-07-01
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

HTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).

Timeline

dates in UTC
  1. 2021-07-0103:15CVE publishedNVD

Versions per branch

NVD
Htslibversion to verify
BranchAffectedFixed in
1.10≤ 1.10.2no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • htslibUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • htslibUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • htslibUbuntu:Pro:14.04:LTSall versions · no fixed version listed
  • htslibUbuntu:20.04:LTSall versions · no fixed version listed
  • htslibopenEuler:20.03-LTS-SP3all versions · fixed in 1.11-1.oe1
  • htslibopenEuler:20.03-LTS-SP1all versions · fixed in 1.11-1.oe1
  • htslibDebian:14all versions · fixed in 1.11-1
  • htslibDebian:13all versions · fixed in 1.11-1

5 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-36403 Red Hat Product Security

    htslib: out-of-bounds write access in vcf_parse_format()

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2021-07-01
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-9cpm-77gg-x323

Frequently asked questions

What is CVE-2020-36403?

HTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).

Is CVE-2020-36403 actively exploited?

Active exploitation of CVE-2020-36403 has not been confirmed. Its EPSS score was 1.6% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-36403?

CVE-2020-36403 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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