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CVE-2021-33177

Status: ModifiedHigh (8.8)—

The Bulk Modifications functionality in Nagios XI versions prior to 5.8.5 is vulnerable to SQL injection. Exploitation requires the malicious actor to be authenticated to the vulnerable system, but once authenticated they would be able to execute arbitrary sql queries.

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)

Nagios — Nagios XI

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-33177",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "disclosure@synopsys.com",
      "affectedData": [
        {
          "vendor": "Nagios",
          "product": "Nagios XI",
          "versions": [
            {
              "status": "affected",
              "version": "<5.8.5"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-10-14T15:15:08.990",
  "references": [
    {
      "url": "https://www.synopsys.com/blogs/software-security/cyrc-advisory-nagios-xi",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "disclosure@synopsys.com"
    },
    {
      "url": "https://www.synopsys.com/blogs/software-security/cyrc-advisory-nagios-xi",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "disclosure@synopsys.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-89"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-89"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Bulk Modifications functionality in Nagios XI versions prior to 5.8.5 is vulnerable to SQL injection. Exploitation requires the malicious actor to be authenticated to the vulnerable system, but once authenticated they would be able to execute arbitrary sql queries."
    },
    {
      "lang": "es",
      "value": "La funcionalidad Bulk Modifications en Nagios XI versiones anteriores a 5.8.5, es vulnerable a una inyección SQL. La explotación requiere que el actor malicioso se autentique en el sistema vulnerable, pero una vez autenticado podría ejecutar consultas sql arbitrarias"
    }
  ],
  "lastModified": "2026-06-17T03:54:18.543",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:nagios:nagios_xi:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "16C2735A-6289-4DA5-B50A-E98B837C8B9B",
              "versionEndExcluding": "5.8.5"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "disclosure@synopsys.com"
}