High
Security advisory
On April 20, 2022, the following vulnerability in the ClamAV scanning library versions 0.103.5 and earlier and 0.104.2 and earlier was disclosed: A vulnerability in CHM file parser of Clam AntiVirus (ClamAV) versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. For a description of this vulnerability, see the ClamAV blog. This advisory will be updated as additional information becomes available.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2022-20770
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:56 UTC · Revision 1
Source evidence
On April 20, 2022, the following vulnerability in the ClamAV scanning library versions 0.103.5 and earlier and 0.104.2 and earlier was disclosed: A vulnerability in CHM file parser of Clam AntiVirus (ClamAV) versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. For a description of this vulnerability, see the ClamAV blog. This advisory will be updated as additional information becomes available.
osv:CVE-2022-20770
Complete source record
{
"id": "24b03cf4df564259c618458007fa2295ee690bdda1ae1c7ac28eeb354c9c912d",
"url": "https://osv.dev/vulnerability/CVE-2022-20770",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2022-20770",
"summary": "On April 20, 2022, the following vulnerability in the ClamAV scanning library versions 0.103.5 and earlier and 0.104.2 and earlier was disclosed: A vulnerability in CHM file parser of Clam AntiVirus (ClamAV) versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. For a description of this vulnerability, see the ClamAV blog. This advisory will be updated as additional information becomes available.",
"evidence": "osv:CVE-2022-20770",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2022-20770",
"aliases": [
"CVE-2022-20770"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/cisco-talos/clamav",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "5faab1937cc2b89049ef7748dc9a10545707613d"
},
{
"introduced": "ba51bf8e644921a1592d2f3d280a2daa924acfd8"
},
{
"last_affected": "fb828e93cab6b73818c1d94ffd05d92720a85c6f"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:clamav:clamav:*:*:*:*:lts:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "0.103.5"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0.104.0"
},
{
"last_affected": "0.104.2"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"clamav-0.104.2",
"clamav-0.103.5",
"clamav-0.103.4",
"clamav-0.104.1",
"clamav-0.103.3",
"clamav-0.104.0",
"clamav-0.103.2",
"clamav-0.103.1",
"clamav-0.103.0",
"clamav-0.103.0-rc2",
"clamav-0.103.0-rc",
"clamav-0.102.0",
"clamav-0.101.0",
"clamav-0.97",
"clamav-0.97rc",
"clamav-0.96.5",
"clamav-0.96.4",
"clamav-0.96.3",
"clamav-0.96.2",
"clamav-0.96",
"clamav-0.96rc2",
"clamav-0.96rc1",
"merge-llvm-97877",
"r5076"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-20770.json"
}
}
],
"modified": "2026-10-24T10:31:00.534107678Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7RV6BLIATIJE74SQ6NG5ZC4JK5MMDQ2R/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BX5ZXNHP4NFYQ5BFSKY3WT7NTBZUYG7L/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N4NNBIJVG6Z4PDIKUZXTYXICYUAYAZ56/",
"https://lists.debian.org/debian-lts-announce/2022/06/msg00004.html",
"https://security.gentoo.org/glsa/202310-01",
"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-dos-prVGcHLd"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:linux:*:*",
"cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:macos:*:*",
"cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:windows:*:*"
],
"vendor_product": "cisco:secure_endpoint",
"extracted_events": [
{
"range": [
{
"fixed": "1.16.3"
},
{
"fixed": "1.17.2"
},
{
"fixed": "7.5.5"
},
{
"introduced": "1.18.0"
},
{
"fixed": "1.18.2"
},
{
"introduced": "1.18.0"
},
{
"fixed": "1.18.2"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "34"
},
{
"last_affected": "34"
},
{
"introduced": "35"
},
{
"last_affected": "35"
},
{
"introduced": "36"
},
{
"last_affected": "36"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2022-20770",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 439562,
"published_at": "2022-05-04T17:15:08.377+00:00"
}