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CVE-2026-61550

Status: Awaiting AnalysisCritical (9.8)—

Icinga 2 is an open source monitoring system. From 2.8 until 2.14.9, 2.15.4, and 2.16.2, certificate update JSON-RPC message handling does not validate that the sender is a trusted endpoint. An unauthenticated network attacker able to connect to TCP port 5665 can replace the node certificate and trusted CA certificate, impersonate a trusted node, and take control of the node. This issue is fixed in versions 2.14.9, 2.15.4, and 2.16.2.

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).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

AV:N/AC:L/PR:N permite explotación remota sin autenticación (T1190). Reemplazo de certificados y suplantación de nodos confiables permite asumir identidad de endpoint (T1078, T1550.001 impersonation).

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Application Developer GuidancePrivileged Account ManagementAccount Use PoliciesActive Directory ConfigurationVulnerability ScanningUser Training

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Icinga — Icinga 2AI

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-61550",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-61550",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-21T15:29:22.834072Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "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": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "Icinga",
          "product": "icinga2",
          "versions": [
            {
              "status": "affected",
              "version": ">= 2.8, < 2.14.9"
            },
            {
              "status": "affected",
              "version": ">= 2.15.0, < 2.15.4"
            },
            {
              "status": "affected",
              "version": ">= 2.16.0, < 2.16.2"
            }
          ]
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  "published": "2026-09-18T18:17:08.217",
  "references": [
    {
      "url": "https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0",
      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039c",
      "source": "security-advisories@github.com"
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/Icinga/icinga2/pull/10907",
      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/Icinga/icinga2/releases/tag/v2.14.9",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/Icinga/icinga2/releases/tag/v2.15.4",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/Icinga/icinga2/releases/tag/v2.16.2",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://icinga.com/blog/icinga2-security-release-v2-16-2",
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Icinga 2 is an open source monitoring system. From 2.8 until 2.14.9, 2.15.4, and 2.16.2, certificate update JSON-RPC message handling does not validate that the sender is a trusted endpoint. An unauthenticated network attacker able to connect to TCP port 5665 can replace the node certificate and trusted CA certificate, impersonate a trusted node, and take control of the node. This issue is fixed in versions 2.14.9, 2.15.4, and 2.16.2."
    }
  ],
  "lastModified": "2026-09-24T21:17:43.237",
  "sourceIdentifier": "security-advisories@github.com"
}