{"id":"CVE-2025-40551","published":"2026-01-28T08:16:02Z","modified":"2026-06-17T09:21:44Z","title":"SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability","vendor":"SolarWinds","product":"Web Help Desk","tier":"core","eol":null,"description":{"text":"SolarWinds Web Help Desk was found to be susceptible to an untrusted data deserialization vulnerability that could lead to remote code execution, which would allow an attacker to run commands on the host machine. This could be exploited without authentication.","provenance":"source","from":"NVD"},"summary":{"text":"A deserialization of untrusted data flaw in SolarWinds Web Help Desk, the product's component handling incoming serialized data. An attacker with network access can exploit it without authentication or user interaction to achieve remote code execution, running commands on the host machine.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:11:53Z"},"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.84181,"percentile":0.99694,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2026-02-03","dueDate":"2026-02-06","ransomware":false,"requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://www.solarwinds.com/trust-center/security-advisories/cve-2025-40551 ; https://nvd.nist.gov/vuln/detail/CVE-2025-40551","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-02-03","exploitedFirstSeen":"2026-02-03","ransomware":false,"evidence":[{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-02-03"},{"url":"https://www.huntress.com/blog/active-exploitation-solarwinds-web-help-desk-cve-2025-26399","date":"2026-02-08"},{"url":"https://www.recordedfuture.com/blog/january-2026-cve-landscape","date":"2026-02-24"},{"url":"https://cyble.com/reports/H1-2026-Global-Threat-Landscape-Report.pdf","date":"2026-07-27"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-10-03&host_type=src&vulnerability=cve-2025-40551","date":"2026-10-03"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-10-22&host_type=src&vulnerability=cve-2025-40551","date":"2026-10-22"}],"evidenceTotal":6,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 30, 2026","url":"https://otx.alienvault.com/pulse/6ae35d889ea92b4ce19c2680","created":"2026-10-29"},{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"}],"provenance":"machine"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"references":[{"url":"https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_2026-1_release_notes.htm","tags":["Release Notes"]},{"url":"https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-40551","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-40551","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: unauthenticated remote exploitation of public-facing app","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"could be exploited without authentication","start":218,"end":259}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: remote code execution runs attacker commands","mappingType":"primary_impact","evidence":[{"from":"description","quote":"which would allow an attacker to run commands on the host machine","start":146,"end":211}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2025-206426","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-206426","exploited":true,"exploitedSince":"2026-02-03","provenance":"source"},"exploits":[],"exploitSources":{"metasploit":[{"name":"SolarWinds Web Help Desk unauthenticated RCE","module":"exploit/multi/http/solarwinds_webhelpdesk_rce","type":"exploit","disclosureDate":"2026-01-28","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/solarwinds_webhelpdesk_rce.rb"}],"nuclei":[{"id":"CVE-2025-40551","name":"SolarWinds Web Help Desk < 2026.1 - Unauthenticated JNDI Injection RCE","severity":"critical","path":"http/cves/2025/CVE-2025-40551.yaml","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-40551.yaml"}],"first":{"date":"2026-01-28","source":"Metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/solarwinds_webhelpdesk_rce.rb"},"provenance":"source"},"detections":{"cveRules":[{"title":"Suspicious Child Process of SolarWinds 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code","points":5.0,"detail":"1 Metasploit module; 1 nuclei template"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":6.86,"detail":"base score 9.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}