CVE-2026-28318: SolarWinds Serv-U - Denial of Service

id: CVE-2026-28318

info:
  name: SolarWinds Serv-U - Denial of Service
  author: 0x_Akoko
  severity: high
  description: |
    SolarWinds Serv-U contains a denial of service vulnerability caused by specially crafted POST requests with Content-Encoding: deflate, letting unauthenticated attackers crash the Serv-U service, exploit requires no authentication.
  impact: |
    Unauthenticated attackers can crash the Serv-U service, causing denial of service.
  remediation: |
    Update to the latest version or follow mitigation steps from SolarWinds Trust Center.
  reference:
    - https://www.solarwinds.com/trust-center/security-advisories/cve-2026-28318
    - https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4_release_notes.htm
    - https://nvd.nist.gov/vuln/detail/CVE-2026-28318
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    cvss-score: 7.5
    cve-id: CVE-2026-28318
    cwe-id: CWE-400
  metadata:
    max-request: 1
    vendor: solarwinds
    product: serv-u
    shodan-query: product:"rhinosoft serv-u httpd"
    fofa-query: server="Serv-U"
  tags: cve,cve2026,solarwinds,serv-u,kev,vkev,detect,passive,vd

http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{Hostname}}

    host-redirects: true
    max-redirects: 2

    extractors:
      - type: regex
        name: servuversion
        part: header
        internal: true
        group: 1
        regex:
          - 'Serv-U/([0-9]+\.[0-9]+(?:\.[0-9]+)*)'

      - type: regex
        part: header
        group: 0
        regex:
          - 'Serv-U/[0-9]+\.[0-9]+(?:\.[0-9]+)*'

    matchers:
      - type: dsl
        dsl:
          - 'contains(header, "Serv-U/")'
          - 'len(servuversion) > 0'
          - 'compare_versions(servuversion, ">= 1.0", "<= 15.5.4")'
        condition: and
# digest: 4a0a00473045022100b5282304a898ab406ec71484c2946e7fbf5e247933298876c5eae7a538c006dd0220238caeca6ac238f637d3c68e17c8f1eacacd8025009cb2dc875605305a99b075:922c64590222798bb761d5b6d8e72950

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