High
Security advisory
Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all available CPU cycles during handling of a crafted Cache Digest response message. This only occurs when cache_peer is used with the cache digests feature. The problem exists because peerDigestHandleReply() livelocking in peer_digest.cc mishandles EOF.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-24606
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:45 UTC · Revision 1
Source evidence
Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all available CPU cycles during handling of a crafted Cache Digest response message. This only occurs when cache_peer is used with the cache digests feature. The problem exists because peerDigestHandleReply() livelocking in peer_digest.cc mishandles EOF.
osv:CVE-2020-24606
Complete source record
{
"id": "d13d41117d814b3df527c2c47a504f6da69f93be91d8763df71cb50265e6ab7e",
"url": "https://osv.dev/vulnerability/CVE-2020-24606",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-24606",
"summary": "Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all available CPU cycles during handling of a crafted Cache Digest response message. This only occurs when cache_peer is used with the cache digests feature. The problem exists because peerDigestHandleReply() livelocking in peer_digest.cc mishandles EOF.",
"evidence": "osv:CVE-2020-24606",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-24606",
"aliases": [
"CVE-2020-24606",
"GHSA-vvj7-xjgq-g2jg"
],
"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/squid-cache/squid",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "3f5d044d9a4873b3c769d13c43d5d3f9bfe258a3"
},
{
"introduced": "8a511d5e05aa17b47c7566839fd9c524512489d3"
},
{
"fixed": "f4ade365f80fcf9fec62b31f9a4df5e26e42e206"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0"
},
{
"fixed": "4.13"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.0.1"
},
{
"fixed": "5.0.4"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"SQUID_4_12",
"SQUID_5_0_3",
"SQUID_5_0_2",
"SQUID_4_11",
"SQUID_5_0_1",
"SQUID_4_10",
"SQUID_4_9",
"SQUID_4_8",
"SQUID_4_7",
"SQUID_4_6",
"SQUID_4_5",
"SQUID_4_4",
"SQUID_4_3",
"SQUID_4_2",
"SQUID_4_1",
"SQUID_4_0_25",
"SQUID_4_0_24",
"SQUID_4_0_23",
"SQUID_4_0_22",
"SQUID_4_0_21",
"SQUID_4_0_20",
"SQUID_4_0_19",
"SQUID_4_0_18",
"SQUID_4_0_17",
"SQUID_4_0_16",
"SQUID_4_0_15",
"SQUID_4_0_14",
"SQUID_4_0_13",
"SQUID_4_0_12",
"SQUID_4_0_11",
"SQUID_4_0_10",
"SQUID_4_0_9",
"SQUID_4_0_8",
"SQUID_4_0_7",
"SQUID_4_0_6",
"SQUID_4_0_5",
"SQUID_4_0_4",
"SQUID_4_0_3",
"SQUID_4_0_2",
"SQUID_4_0_1",
"take00",
"SQUID_3_0_RC1",
"SQUID_3_0_PRE7",
"SQUID_3_0_PRE6",
"SQUID_3_0_PRE5",
"SQUID_3_0_PRE4",
"SQUID_3_0_PRE3",
"SQUID_3_0_PRE2",
"SQUID_3_0_PRE1",
"HISTORIC_RELEASES"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-24606.json"
}
}
],
"modified": "2026-10-24T10:50:01.530854037Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BE6FKUN7IGTIR2MEEMWYDT7N5EJJLZI2/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMTFLVB7GLRF2CKGFPZ4G4R5DIIPHWI3/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HJJDI7JQFGQLVNCKMVY64LAFMKERAOK7/",
"https://github.com/squid-cache/squid/security/advisories/GHSA-vvj7-xjgq-g2jg",
"https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html",
"https://security.netapp.com/advisory/ntap-20210219-0007/",
"https://security.netapp.com/advisory/ntap-20210226-0006/",
"https://security.netapp.com/advisory/ntap-20210226-0007/",
"https://usn.ubuntu.com/4477-1/",
"https://usn.ubuntu.com/4551-1/",
"https://www.debian.org/security/2020/dsa-4751"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
},
{
"introduced": "20.04"
},
{
"last_affected": "20.04"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
},
{
"introduced": "10.0"
},
{
"last_affected": "10.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "31"
},
{
"last_affected": "31"
},
{
"introduced": "32"
},
{
"last_affected": "32"
},
{
"introduced": "33"
},
{
"last_affected": "33"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*",
"cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*"
],
"vendor_product": "opensuse:leap",
"extracted_events": [
{
"range": [
{
"introduced": "15.1"
},
{
"last_affected": "15.1"
},
{
"introduced": "15.2"
},
{
"last_affected": "15.2"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-24606",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 441903,
"published_at": "2020-08-24T18:15:10.047+00:00"
}