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CVE-2020-12637

Status: ModifiedCritical (9.8)—

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.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Zulipchat — Zulip Desktop

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2020-12637",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2020-05-09T17:15:11.613",
  "references": [
    {
      "url": "https://blog.zulip.org/2020/05/06/zulip-desktop-5-2-0-security-release/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://blog.zulip.org/2020/05/06/zulip-desktop-5-2-0-security-release/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "Zulip Desktop versiones anteriores a 5.2.0, presenta una Falta de Comprobación del Certificado SSL, porque toda la comprobación fue deshabilitada inadvertidamente durante un intento de reconocer la opción ignoreCerts."
    }
  ],
  "lastModified": "2026-06-17T02:52:02.850",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:zulipchat:zulip_desktop:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "170327B9-D6F1-4F6C-8E18-018C836D0AD9",
              "versionEndExcluding": "5.2.0",
              "versionStartIncluding": "0.5.10"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}