{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-22321", "assignerOrgId": "270ccfa6-a436-4e77-922e-914ec3a9685c", "state": "PUBLISHED", "assignerShortName": "CERTVDE", "dateReserved": "2026-01-07T11:49:15.178Z", "datePublished": "2026-03-18T07:34:36.289Z", "dateUpdated": "2026-03-18T07:34:36.289Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "FL SWITCH 2005", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2008", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2016", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2105", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2108", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2116", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2204-2TC-2SFX", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2205", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2206-2FX", 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"vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2414-2SFX PN", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2416", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2416 PN", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2504-2GC-2SFP", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2506-2SFP", 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"Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2708", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2708 PN", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2303-8SP1", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL NAT 2008", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL NAT 2208", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL NAT 2304-2GC-2SFP", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2008F", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2316/K1", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2506-2SFP/K1", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 2508/K1", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH TSN 2316", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH TSN 2312-2GC-2SFP", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH TSN 2314-2SFP", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 5924-4GC", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 5916-8GC-4SFP+", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 5924SFP-4GC", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 5924-4SFP+", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "FL SWITCH 5916SFP-8GC-4SFP+", "vendor": "Phoenix Contact", "versions": [{"lessThan": "3.53", "status": "affected", "version": "0.0.0", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "finder", "user": "00000000-0000-4000-9000-000000000000", "value": "Gabriele Quagliarella from Nozomi Networks"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "A stack-based buffer overflow in the device's Telnet/SSH CLI login routine occurs when a unauthenticated attacker send an oversized or unexpected username input. An overflow condition crashes the thread handling the login attempt, forcing the session to close. Because other CLI sessions remain unaffected, the impact is limited to a low\u2011severity availability disruption.<br>"}], "value": "A stack-based buffer overflow in the device's Telnet/SSH CLI login routine occurs when a unauthenticated attacker send an oversized or unexpected username input. An overflow condition crashes the thread handling the login attempt, forcing the session to close. Because other CLI sessions remain unaffected, the impact is limited to a low\u2011severity availability disruption."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-121", "description": "CWE-121 Stack-based Buffer Overflow", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "270ccfa6-a436-4e77-922e-914ec3a9685c", "shortName": "CERTVDE", "dateUpdated": "2026-03-18T07:34:36.289Z"}, "references": [{"url": "https://certvde.com/de/advisories/VDE-2025-104"}], "source": {"advisory": "VDE-2025-104", "defect": ["CERT@VDE#641898"], "discovery": "UNKNOWN"}, "title": "Stack-Based Buffer Overflow in CLI Login Username Handling over CLI", "x_generator": {"engine": "Vulnogram 0.1.0-dev"}}}}
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