High
Security advisory
The Squid Software Foundation Squid HTTP Caching Proxy version 3.0 to 3.5.27, 4.0 to 4.0.22 contains a Incorrect Pointer Handling vulnerability in ESI Response Processing that can result in Denial of Service for all clients using the proxy.. This attack appear to be exploitable via Remote server delivers an HTTP response payload containing valid but unusual ESI syntax.. This vulnerability appears to have been fixed in 4.0.23 and later.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-1000024
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:13 UTC · Revision 1
Source evidence
The Squid Software Foundation Squid HTTP Caching Proxy version 3.0 to 3.5.27, 4.0 to 4.0.22 contains a Incorrect Pointer Handling vulnerability in ESI Response Processing that can result in Denial of Service for all clients using the proxy.. This attack appear to be exploitable via Remote server delivers an HTTP response payload containing valid but unusual ESI syntax.. This vulnerability appears to have been fixed in 4.0.23 and later.
osv:CVE-2018-1000024
Complete source record
{
"id": "f4342b55ef537a03e6677db9afc21431f49ffecbbefda272fff826c21905663d",
"url": "https://osv.dev/vulnerability/CVE-2018-1000024",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-1000024",
"summary": "The Squid Software Foundation Squid HTTP Caching Proxy version 3.0 to 3.5.27, 4.0 to 4.0.22 contains a Incorrect Pointer Handling vulnerability in ESI Response Processing that can result in Denial of Service for all clients using the proxy.. This attack appear to be exploitable via Remote server delivers an HTTP response payload containing valid but unusual ESI syntax.. This vulnerability appears to have been fixed in 4.0.23 and later.",
"evidence": "osv:CVE-2018-1000024",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2018-1000024",
"aliases": [
"CVE-2018-1000024"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/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"
},
{
"last_affected": "c321737de30e69b0d31944b8962eccd4e88b7267"
},
{
"last_affected": "0d79d418301c6594f6645582eed62e2ca5bc67fc"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0"
},
{
"last_affected": "3.5.27"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.0"
},
{
"last_affected": "4.0.22"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"SQUID_3_5_27",
"M-staged-PR264",
"M-staged-PR268",
"M-staged-PR267",
"M-staged-PR266",
"M-staged-PR258",
"M-staged-PR230",
"M-staged-PR255",
"M-staged-PR252",
"M-staged-PR229",
"M-staged-PR241",
"M-staged-PR239",
"M-staged-PR242",
"M-staged-PR235",
"M-staged-PR238",
"M-staged-PR218",
"M-staged-PR237",
"M-staged-PR227",
"M-staged-PR202",
"M-staged-PR225",
"M-staged-PR220",
"M-staged-PR221",
"M-staged-PR210",
"M-staged-PR209",
"M-staged-PR208",
"M-staged-PR198",
"M-staged-PR206",
"M-staged-PR182",
"M-staged-PR195",
"M-staged-PR199",
"M-staged-PR200",
"M-staged-PR196",
"M-staged-PR193",
"M-staged-PR181",
"M-staged-PR189",
"M-staged-PR176",
"M-staged-PR186",
"M-staged-PR179",
"M-staged-PR170",
"M-staged-PR161",
"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-2018-1000024.json"
}
}
],
"modified": "2026-10-24T10:31:04.600113010Z",
"provider": "osv",
"references": [
"https://usn.ubuntu.com/4059-2/",
"https://lists.debian.org/debian-lts-announce/2018/02/msg00001.html",
"https://usn.ubuntu.com/3557-1/",
"https://www.debian.org/security/2018/dsa-4122"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "14.04"
},
{
"last_affected": "14.04"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "17.10"
},
{
"last_affected": "17.10"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
},
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
},
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-1000024",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 440558,
"published_at": "2018-02-09T23:29:00.73+00:00"
}