CVE-2020-36221 (GCVE-0-2020-36221)

Vulnerability from cvelistv5 – Published: 2021-01-25 09:44 – Updated: 2026-10-14 09:44
VLAI
Summary
An integer underflow was discovered in OpenLDAP before 2.4.57 leading to slapd crashes in the Certificate Exact Assertion processing, resulting in denial of service (schema_init.c serialNumberAndIssuerCheck).
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • n/a
Assigner
mitre CNA under the mitre root
CNA scorecard E 28/100 over 2316 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
Show details on NVD website
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "An integer underflow was discovered in OpenLDAP before 2.4.57 leading to slapd crashes in the Certificate Exact Assertion processing, resulting in denial of service (schema_init.c serialNumberAndIssuerCheck)."
          },
          {
            "lang": "es",
            "value": "Se detect\u00f3 un subdesbordamiento de enteros en OpenLDAP versiones anteriores a 2.4.57, conllevando bloqueos de slapd en el procesamiento de Certificate Exact Assertion, resultando en una denegaci\u00f3n de servicio (serialNumberAndIssuerCheck de schema_init.c)"
          }
        ],
        "id": "CVE-2020-36221",
        "lastModified": "2026-10-14T10:17:35.657",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
              "cvssData": {
                "accessComplexity": "LOW",
                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "PARTIAL",
                "baseScore": 5.0,
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
                "version": "2.0"
              },
              "exploitabilityScore": 10.0,
              "impactScore": 2.9,
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              "obtainOtherPrivilege": false,
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                "confidentialityImpact": "NONE",
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                "scope": "UNCHANGED",
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        "published": "2021-01-26T18:15:56.693",
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        "sourceIdentifier": "cve@mitre.org",
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                "lang": "en",
                "value": "CWE-191"
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            "source": "nvd@nist.gov",
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T16:13:06+00:00",
      "cve": "CVE-2020-36221",
      "id": "CVE-2020-36221",
      "initial_release_date": "2020-01-01T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "9",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "openldap: Integer underflow in serialNumberAndIssuerCheck in schema_init.c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-36221.json",
      "version": "3"
    }
  }
}



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