{"id":"CVE-2021-35247","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-35247","generatedAt":"2026-10-31T13:56:56.761Z","title":"SolarWinds Serv-U Improper Input Validation Vulnerability","description":"Serv-U web login screen to LDAP authentication was allowing characters that were not sufficiently sanitized. SolarWinds has updated the input mechanism to perform additional validation and sanitization. Please Note: No downstream affect has been detected as the LDAP servers ignored improper characters. To insure proper input validation is completed in all environments. SolarWinds recommends scheduling an update to the latest version of Serv-U.","published":"2022-01-10T14:10:18.000Z","lastModified":"2026-06-17T03:57:23.000Z","status":"Analyzed","sourceIdentifier":"psirt@solarwinds.com","cvss":{"version":"3.1","score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},"cwe":["CWE-20"],"affected":["solarwinds/serv-u"],"epss":{"score":0.03453,"percentile":0.89004,"date":"2026-10-30","history":[]},"kev":{"listed":true,"dateAdded":"2022-01-21","dueDate":"2022-02-04","knownRansomwareCampaignUse":"Unknown","notes":"Apply updates per vendor instructions.\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-35247"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 4 February 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[],"references":[{"url":"https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm","tags":["Release Notes","Vendor Advisory"],"source":"psirt@solarwinds.com"},{"url":"https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247","tags":["Broken Link","Vendor Advisory"],"source":"psirt@solarwinds.com"},{"url":"https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247","tags":["Broken Link","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35247","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-35247","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}