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CVE-2022-27577

Status: ModifiedCritical (9.1)—

The vulnerability in the MSC800 in all versions before 4.15 allows for an attacker to predict the TCP initial sequence number. When the TCP sequence is predictable, an attacker can send packets that are forged to appear to come from a trusted computer. These forged packets could compromise services on the MSC800. SICK has released a new firmware version of the SICK MSC800 and recommends updating to the newest version.

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)

Sick — Msc800 Firmware

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2022-27577",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 6.4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
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          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.2,
        "exploitabilityScore": 3.9
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  "affected": [
    {
      "source": "psirt@sick.de",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "SICK MSC800",
          "versions": [
            {
              "status": "affected",
              "version": "All versions before 4.15"
            }
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  ],
  "published": "2022-04-11T20:15:22.027",
  "references": [
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      "url": "https://sick.com/psirt",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@sick.de"
    },
    {
      "url": "https://sick.com/psirt",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary",
      "source": "psirt@sick.de",
      "description": [
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          "lang": "en",
          "value": "CWE-342"
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    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-330"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The vulnerability in the MSC800 in all versions before 4.15 allows for an attacker to predict the TCP initial sequence number. When the TCP sequence is predictable, an attacker can send packets that are forged to appear to come from a trusted computer. These forged packets could compromise services on the MSC800. SICK has released a new firmware version of the SICK MSC800 and recommends updating to the newest version."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en el MSC800 en todas las versiones anteriores a 4.15 permite a un atacante predecir el número de secuencia inicial TCP. Cuando la secuencia TCP es predecible, un atacante puede enviar paquetes falsificados para que parezcan proceder de un ordenador confiable. Estos paquetes falsificados podrían comprometer los servicios del MSC800. SICK ha publicado una nueva versión de firmware del SICK MSC800 y recomienda actualizar a la versión más reciente"
    }
  ],
  "lastModified": "2026-06-17T04:37:17.970",
  "configurations": [
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              "versionEndExcluding": "4.15"
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  "sourceIdentifier": "psirt@sick.de"
}