{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-18717", "assignerOrgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "state": "PUBLISHED", "assignerShortName": "icscert", "dateReserved": "2026-08-03T16:30:40.486Z", "datePublished": "2026-08-27T20:20:23.451Z", "dateUpdated": "2026-08-27T20:20:23.451Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "shortName": "icscert", "dateUpdated": "2026-08-27T20:20:23.451Z"}, "title": "Improper Certificate Validation in ASE 2000", "datePublic": "2026-08-27T18:30:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-295", "description": "CWE-295 Improper certificate validation", "type": "CWE"}]}], "affected": [{"vendor": "Applied Systems Engineering", "product": "ASE2000 V2", "versions": [{"status": "affected", "version": "2.25", "lessThanOrEqual": "2.37", "versionType": "custom"}, {"status": "unaffected", "version": "2.38"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "ASE2000 2.35 through 2.37 is vulnerable to an improper certificate validation vulnerability, which may allow an attacker to impersonate the trusted peer, complete the TLS handshake, and read or modify protected communications.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "ASE2000 2.35 through 2.37 is vulnerable to an improper certificate validation vulnerability, which may allow an attacker to impersonate the trusted peer, complete the TLS handshake, and read or modify protected communications."}]}], "references": [{"url": "http://www.ase-systems.com"}, {"url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-239-04"}, {"url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-239-04.json"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE", "baseSeverity": "HIGH", "baseScore": 7.4, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9.1, "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"}}], "workarounds": [{"lang": "en", "value": "Until the upgrade can be applied, the following interim measures reduce exposure:\n\n * Restrict write access to the ASE2000 installation directory and its configuration files to trusted administrators only.\n * Avoid\n using IEC 60870-5-104 over TLS across untrusted or shared networks; \nplace ASE2000 hosts on an isolated, segmented network reachable only by \nintended peers.\n * Ensure the host is protected by a network firewall.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div>Until the upgrade can be applied, the following interim measures reduce exposure:</div><ul><li>Restrict write access to the ASE2000 installation directory and its configuration files to trusted administrators only.</li><li>Avoid\n using IEC 60870-5-104 over TLS across untrusted or shared networks; \nplace ASE2000 hosts on an isolated, segmented network reachable only by \nintended peers.</li><li>Ensure the host is protected by a network firewall.</li></ul>"}]}], "solutions": [{"lang": "en", "value": "ASE/Kalkitech provides an upgraded version 2.38 that fixes both vulnerabilities and customers are advised to upgrade to version 2.38. In version 2.38 the bundled log4net library is upgraded to version 3.3.1.0, and the IEC 60870-5-104 TLS client certificate validation logic is corrected to ensure proper validation of certificate error conditions.\n\n\nAll customers running ASE2000 versions 2.25 through 2.37 are affected by this issue and are required to upgrade to version 2.38 or later to apply the security fix. Upgrade instructions and user documentation are available at www.ase-systems.com . For detailed, step-by-step guidance on upgrading to the latest version and patching the impacted components, please contact our support team at [email protected].", "supportingMedia": [{"type": "text/html", "base64": false, "value": "ASE/Kalkitech provides an upgraded version 2.38 that fixes both vulnerabilities and customers are advised to upgrade to version 2.38. In version 2.38 the bundled log4net library is upgraded to version 3.3.1.0, and the IEC 60870-5-104 TLS client certificate validation logic is corrected to ensure proper validation of certificate error conditions.<div><br></div><div>All customers running ASE2000 versions 2.25 through 2.37 are affected by this issue and are required to upgrade to version 2.38 or later to apply the security fix. Upgrade instructions and user documentation are available at <a href=\"www.ase-systems.com\">www.ase-systems.com</a>. For detailed, step-by-step guidance on upgrading to the latest version and patching the impacted components, please contact our support team at [email protected].</div>"}]}], "credits": [{"lang": "en", "value": "Enoch Wang reported this vulnerability to CISA.", "type": "finder"}], "source": {"advisory": "ICSA-26-239-04", "discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "ASE2000 V2", "vendor": "Applied Systems Engineering", "versions": [{"lessThanOrEqual": "2.37", "status": "affected", "version": "2.25", "versionType": "custom"}, {"status": "unaffected", "version": "2.38"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "ASE2000 2.35 through 2.37 is vulnerable to an improper certificate validation vulnerability, which may allow an attacker to impersonate the trusted peer, complete the TLS handshake, and read or modify protected communications."}], "id": "CVE-2026-18717", "lastModified": "2026-08-28T00:16:48.740", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "[email protected]", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-08-28T00:16:48.740", "references": [{"source": "[email protected]", "url": "http://www.ase-systems.com"}, {"source": "[email protected]", "url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-239-04.json"}, {"source": "[email protected]", "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-239-04"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "[email protected]", "type": "Primary"}]}

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