ZeroDay Findings
Sign inSign up

Findings

CVE-2021-20021

SonicWall Email Security Improper Privilege Management Vulnerability

Published Apr 9, 2021 · updated Aug 11, 2026 · sonicwall email security

SonicWall Email Security contains an improper privilege management vulnerability that allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20022 and CVE-2021-20023 to achieve privilege escalation.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 9, 2021 · Catalog

    Detected

    SonicWall Email Security contains an improper privilege management vulnerability that allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20022 and CVE-2021-20023 to achieve privilege escalation.

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Nov 17, 2021 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Aug 11, 2026 · Catalog

    Updated

    SonicWall Email Security contains an improper privilege management vulnerability that allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20022 and CVE-2021-20023 to achieve privilege escalation.

Required action

Apply updates per vendor instructions.

CISA due date Nov 17, 2021

Affected

  • cpe sonicwall/email securityversion unspecified
  • cpe sonicwall/email security appliance 3300 firmwareversion unspecified
  • cpe sonicwall/email security appliance 4300 firmwareversion unspecified
  • cpe sonicwall/email security appliance 5000 firmwareversion unspecified
  • cpe sonicwall/email security appliance 5050 firmwareversion unspecified
  • cpe sonicwall/email security appliance 7000 firmwareversion unspecified
  • cpe sonicwall/email security appliance 7050 firmwareversion unspecified
  • cpe sonicwall/email security appliance 8300 firmwareversion unspecified
  • cpe sonicwall/email security appliance 9000 firmwareversion unspecified
  • cpe sonicwall/email security virtual applianceversion unspecified
  • vendor SonicWall SonicWall Email Securityversion unspecified

Sources

  • CISA KEVCVE-2021-20021

    SonicWall Email Security contains an improper privilege management vulnerability that allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20022 and CVE-2021-20023 to achieve privilege escalation.

    cisa.gov
  • CVE.orgCVE-2021-20021

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2021-20021

    30-day exploitation probability 88.8%

    first.org
  • NIST NVDCVE-2021-20021

    A vulnerability in the SonicWall Email Security version 10.0.9.x allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host.

    nvd.nist.gov

References