{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-27850", "assignerOrgId": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158", "state": "PUBLISHED", "assignerShortName": "ENISA", "dateReserved": "2026-02-24T07:07:48.974Z", "datePublished": "2026-02-25T16:58:06.450Z", "dateUpdated": "2026-02-25T19:11:29.416Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "affected", "product": "MR9600", "vendor": "Linksys", "versions": [{"status": "affected", "version": "1.0.4.205530"}]}, {"defaultStatus": "unaffected", "product": "MX4200", "vendor": "Linksys", "versions": [{"status": "affected", "version": "1.0.13.210200"}]}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Due to an improperly configured firewall rule, the router will accept any connection on the WAN port with the source port 5222, exposing all services which are normally only accessible through the local network.<br><p>This issue affects MR9600: 1.0.4.205530; MX4200: 1.0.13.210200.</p>"}], "value": "Due to an improperly configured firewall rule, the router will accept any connection on the WAN port with the source port 5222, exposing all services which are normally only accessible through the local network.\nThis issue affects MR9600: 1.0.4.205530; MX4200: 1.0.13.210200."}], "problemTypes": [{"descriptions": [{"description": "cwe-940 Improper Verification of Source of a Communication Channel", "lang": "en"}]}], "providerMetadata": {"orgId": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158", "shortName": "ENISA", "dateUpdated": "2026-02-25T16:58:06.450Z"}, "references": [{"tags": ["third-party-advisory", "technical-description"], "url": "https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-014.txt"}], "source": {"discovery": "UNKNOWN"}, "title": "Improper verification in Linksys MR9600, Linksys MX4200", "x_generator": {"engine": "Vulnogram 0.5.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"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:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-02-25T19:11:25.500248Z", "id": "CVE-2026-27850", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-02-25T19:11:29.416Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Due to an improperly configured firewall rule, the router will accept any connection on the WAN port with the source port 5222, exposing all services which are normally only accessible through the local network.\nThis issue affects MR9600: 1.0.4.205530; MX4200: 1.0.13.210200."}], "id": "CVE-2026-27850", "lastModified": "2026-02-25T20:23:48.737", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-02-25T18:23:41.350", "references": [{"source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158", "url": "https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-014.txt"}], "sourceIdentifier": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158", "vulnStatus": "Received"}

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