CVE-2023-36521
A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3.4), SIMATIC MV540 S (All versions < V3.3.4), SIMATIC MV550 H (All versions < V3.3.4), SIMATIC MV550 S (All versions < V3.3.4), SIMATIC MV560 U (All versions < V3.3.4), SIMATIC MV560 X (All versions < V3.3.4). The result synchronization server of the affected products contains a vulnerability that may lead to a denial of service condition. An attacker may cause a denial of service situation of all socket-based communication of the affected products if the result server is enabled.
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Base score: 7.5
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.63%
- Percentile among all scored CVEs: 48
- Score date: 10/6/2026
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 (6)
CWEs
- CWE-770
- CWE-770
References
Raw JSON (NVD)
Show
{
"id": "CVE-2023-36521",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2023-36521",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2024-11-21T14:06:23.456400Z"
}
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "productcert@siemens.com",
"cvssData": {
"scope": "CHANGED",
"version": "3.1",
"baseScore": 8.6,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
},
"impactScore": 4,
"exploitabilityScore": 3.9
},
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 3.9
}
]
},
"affected": [
{
"source": "productcert@siemens.com",
"affectedData": [
{
"vendor": "Siemens",
"product": "SIMATIC MV540 H",
"versions": [
{
"status": "affected",
"version": "All versions < V3.3.4"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC MV540 S",
"versions": [
{
"status": "affected",
"version": "All versions < V3.3.4"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC MV550 H",
"versions": [
{
"status": "affected",
"version": "All versions < V3.3.4"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC MV550 S",
"versions": [
{
"status": "affected",
"version": "All versions < V3.3.4"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC MV560 U",
"versions": [
{
"status": "affected",
"version": "All versions < V3.3.4"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC MV560 X",
"versions": [
{
"status": "affected",
"version": "All versions < V3.3.4"
}
],
"defaultStatus": "unknown"
}
]
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"affectedData": [
{
"cpes": [
"cpe:2.3:h:siemens:simatic_mv540_h:-:*:*:*:*:*:*:*"
],
"vendor": "siemens",
"product": "simatic_mv540_h",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "V3.3.4",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"cpes": [
"cpe:2.3:h:siemens:simatic_mv540_s:-:*:*:*:*:*:*:*"
],
"vendor": "siemens",
"product": "simatic_mv540_s",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "V3.3.4",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"cpes": [
"cpe:2.3:h:siemens:simatic_mv550_h:-:*:*:*:*:*:*:*"
],
"vendor": "siemens",
"product": "simatic_mv550_h",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "V3.3.4",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"cpes": [
"cpe:2.3:h:siemens:simatic_mv550_s:-:*:*:*:*:*:*:*"
],
"vendor": "siemens",
"product": "simatic_mv550_s",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "V3.3.4",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"cpes": [
"cpe:2.3:h:siemens:simatic_mv560_u:-:*:*:*:*:*:*:*"
],
"vendor": "siemens",
"product": "simatic_mv560_u",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "V3.3.4",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"cpes": [
"cpe:2.3:h:siemens:simatic_mv560_x:-:*:*:*:*:*:*:*"
],
"vendor": "siemens",
"product": "simatic_mv560_x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "V3.3.4",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
}
]
}
],
"published": "2023-07-11T10:15:10.897",
"references": [
{
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-561322.pdf",
"tags": [
"Vendor Advisory"
],
"source": "productcert@siemens.com"
},
{
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-561322.pdf",
"tags": [
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Secondary",
"source": "productcert@siemens.com",
"description": [
{
"lang": "en",
"value": "CWE-770"
}
]
},
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-770"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3.4), SIMATIC MV540 S (All versions < V3.3.4), SIMATIC MV550 H (All versions < V3.3.4), SIMATIC MV550 S (All versions < V3.3.4), SIMATIC MV560 U (All versions < V3.3.4), SIMATIC MV560 X (All versions < V3.3.4). The result synchronization server of the affected products contains a\r\nvulnerability that may lead to a denial of service condition. An attacker may\r\ncause a denial of service situation of all socket-based communication of the\r\naffected products if the result server is enabled."
}
],
"lastModified": "2026-06-17T06:06:27.423",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:siemens:simatic_mv540_h_firmware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "443FA290-C457-4B6A-B7D0-D93A9891422D",
"versionEndExcluding": "3.3.4"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:siemens:simatic_mv540_h:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "18944887-DE3F-4FB4-88D2-1C8EC89A1481"
}
],
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:siemens:simatic_mv540_s_firmware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "93539B72-DB14-467F-B18E-09E02FC32AA2",
"versionEndExcluding": "3.3.4"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:siemens:simatic_mv540_s:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "4B016178-2DCB-417C-B20F-8B9E1904BE8C"
}
],
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:siemens:simatic_mv550_h_firmware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D57AB6A9-9462-4E86-8375-18D8E7B33A68",
"versionEndExcluding": "3.3.4"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:siemens:simatic_mv550_h:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "324A87A6-2DC6-4797-8191-0BE2D8D1F9FC"
}
],
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:siemens:simatic_mv550_s_firmware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "68DA4485-B7D7-4650-89D2-109555CA31E7",
"versionEndExcluding": "3.3.4"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:siemens:simatic_mv550_s:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "4B6E1134-8C21-4045-BD02-F44250474C40"
}
],
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:siemens:simatic_mv560_u_firmware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "A48A7347-0E33-4D16-AA61-B76C561C95B3",
"versionEndExcluding": "3.3.4"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:siemens:simatic_mv560_u:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "D2FBB8F8-C886-4A2B-8808-6E3D6A57B271"
}
],
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:siemens:simatic_mv560_x_firmware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D6AF3675-11B7-4FB3-8151-3D307204CE9A",
"versionEndExcluding": "3.3.4"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:siemens:simatic_mv560_x:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "DAA25C73-59D0-469D-BE6F-6188F645C1D9"
}
],
"operator": "OR"
}
],
"operator": "AND"
}
],
"sourceIdentifier": "productcert@siemens.com"
}