HighFix available
htmldoc — security advisory
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.
- Products
- htmldoc
- Affected versions
- Not specified
- Fixed versions
- 1.9.11-4
- CVEs
- CVE-2021-23180
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 00:33 UTC · Revision 1
Source evidence
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.
osv:DEBIAN-CVE-2021-23180
htmldoc
Fixed versions: 1.9.11-4
htmldoc
Fixed versions: 1.9.11-4
htmldoc
Fixed versions: 1.9.11-4
Complete source record
{
"id": "3bc6dafeb1bc8f13d3c91e037070e3ccb46eae79c5c12ece33f72ddc07b73123",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2021-23180",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2021-23180",
"summary": "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.",
"evidence": "osv:DEBIAN-CVE-2021-23180",
"products": [
{
"name": {
"value": "htmldoc",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.9.11-4",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "htmldoc",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
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"evidence": "/affected/1/ranges"
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],
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},
{
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}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2021-23180",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
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"events": [
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"package": {
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"purl": "pkg:deb/debian/htmldoc?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
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{
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"package": {
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"ecosystem": "Debian:13"
},
"database_specific": {
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],
"package": {
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"purl": "pkg:deb/debian/htmldoc?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-23180.json"
},
"ecosystem_specific": {
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}
}
],
"modified": "2026-10-23T18:03:25.188608775Z",
"provider": "osv",
"upstream": [
"CVE-2021-23180"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2021-23180"
]
},
"related_cves": [
{
"value": "CVE-2021-23180",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 421445,
"published_at": "2022-03-02T23:15:08.283+00:00"
}