Security advisory

{
  "id": "b1f26cefc8787e65d625004941cd24af6dad995c03ecff41f9ae17f6aaa54ec3",
  "url": "https://osv.dev/vulnerability/CVE-2020-12637",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-12637",
    "summary": "Zulip Desktop before 5.2.0 has Missing SSL Certificate Validation because all validation was inadvertently disabled during an attempt to recognize the ignoreCerts option.",
    "evidence": "osv:CVE-2020-12637",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2020-12637",
      "aliases": [
        "CVE-2020-12637"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/zulip/zulip-desktop",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3dade768a750a9d0c08763ec6d9f347040f6807f"
                },
                {
                  "fixed": "e03de261371bb25432a404d3fb37a3723b6f9ad8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:zulipchat:zulip_desktop:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.5.10"
                      },
                      {
                        "fixed": "5.2.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.1.0",
            "v5.0.0",
            "v4.0.2-beta",
            "v4.0.0",
            "v3.1.0-beta",
            "v3.0.0",
            "v2.5.0-beta",
            "v2.5.0",
            "v2.3.82",
            "v2.3.8",
            "v2.3.7-beta",
            "v2.3.6",
            "v2.3.5",
            "v2.3.4-beta",
            "v2.3.3",
            "v2.3.2",
            "v2.2.0-beta",
            "v2.0.0",
            "v1.9.0",
            "v1.8.2",
            "v1.8.1",
            "v1.7.0",
            "v1.6.0-beta",
            "v1.5.0",
            "v1.4.0",
            "v1.3.0-beta",
            "v1.2.0-beta",
            "v1.1.0-beta",
            "v1.0.0-beta",
            "v1.0.0",
            "v0.5.10"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-12637.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:52.216779043Z",
      "provider": "osv",
      "references": [
        "https://blog.zulip.org/2020/05/06/zulip-desktop-5-2-0-security-release/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-12637",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 437654,
  "published_at": "2020-05-09T17:15:11.613+00:00"
}