{
  "id": "CVE-2021-35247",
  "url": "https://spydr.io/cve/CVE-2021-35247",
  "published": "2022-01-10T14:10:17.667Z",
  "modified": "2026-06-17T03:57:22.850Z",
  "score": 5.3,
  "severity": "medium",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
  "score_source": "NVD",
  "epss": 0.03453,
  "epss_percentile": 0.88664,
  "exploited": true,
  "kev": {
    "added": "2022-01-21",
    "due": "2022-02-04",
    "action": "Apply updates per vendor instructions.",
    "ransomware": "Unknown",
    "name": "SolarWinds Serv-U Improper Input Validation Vulnerability",
    "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-35247"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "SolarWinds"
  ],
  "products": [
    "SolarWinds Serv-U"
  ],
  "cwes": [
    "CWE-20"
  ],
  "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.",
  "status": "Analyzed",
  "score_type": "Primary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 5.3,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247",
      "tags": [
        "Broken Link",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35247",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-35247",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}