Security advisory

{
  "id": "379b0efa6d05404ea755e726b092269f7a62d8c7bd70a570c5c3de0906987bad",
  "url": "https://osv.dev/vulnerability/CVE-2018-1172",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-1172",
    "summary": "This vulnerability allows remote attackers to deny service on vulnerable installations of The Squid Software Foundation Squid 3.5.27-20180318. Authentication is not required to exploit this vulnerability. The specific flaw exists within ClientRequestContext::sslBumpAccessCheck(). A crafted request can trigger the dereference of a null pointer. An attacker can leverage this vulnerability to create a denial-of-service condition to users of the system. Was ZDI-CAN-6088.",
    "evidence": "osv:CVE-2018-1172",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2018-1172",
      "aliases": [
        "CVE-2018-1172"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:H/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": "c321737de30e69b0d31944b8962eccd4e88b7267"
                },
                {
                  "last_affected": "c321737de30e69b0d31944b8962eccd4e88b7267"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:squid-cache:squid:3.5.27:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.5.27"
                      },
                      {
                        "last_affected": "3.5.27"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.5.27",
            "SQUID_3_5_27",
            "M-staged-PR264"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-1172.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:18.246569302Z",
      "provider": "osv",
      "references": [
        "https://zerodayinitiative.com/advisories/ZDI-18-309"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-1172",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429729,
  "published_at": "2018-05-16T21:29:00.28+00:00"
}