CVE-2021-20021 kev+ ransomware in the critical feed json
A vulnerability in the SonicWall Email Security version 10.0.9.x allows an attacker to create an administrative account by sending a crafte…
published 5y ago modified 2mo ago also EUVD-2021-7484
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Exploited
- added 2021-11-03, used in ransomware
- epss
- 88.8%
- EPSS 88.8% chance of exploitation in 30 days, percentile 99.7%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
cisa required action Apply updates per vendor instructions.
- sonicwall email_security 10.0.9.6103
- sonicwall email_security_virtual_appliance 10.0.9.6105
- sonicwall hosted_email_security 10.0.9.6103
- sonicwall email_security_appliance_9000_firmware 10.0.9.6105
- sonicwall email_security_appliance_3300_firmware 10.0.9.6105
- sonicwall email_security_appliance_4300_firmware 10.0.9.6105
- sonicwall email_security_appliance_8300_firmware 10.0.9.6105
- sonicwall email_security_appliance_5000_firmware 10.0.9.6105
- sonicwall email_security_appliance_7000_firmware 10.0.9.6105
- sonicwall email_security_appliance_5050_firmware 10.0.9.6105
- sonicwall email_security_appliance_7050_firmware 10.0.9.6105
Is CVE-2021-20021 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerTimeline
- Published
- CISA SSVC: exploitation active
- Added to CISA KEV
- CISA patch deadline
Known exploited
- Added
- 5y ago
- Patch by
- 2021-11-17 (4y ago)
- Ransomware
- Known to be used in ransomware campaigns
- Required action
- Apply updates per vendor instructions.
- Vendor, product
- SonicWall, SonicWall Email Security
- CISA name
- SonicWall Email Security Improper Privilege Management Vulnerability
Ransomware
Groups reported to have exploited it in intrusions.
- FiveHands ransomware gang
- HelloKitty ransomware gang
reported by cloud.google.comic3.gov
Ransomware Vulnerability Matrix by BushidoUK (github.com/BushidoUK/Ransomware-Vulnerability-Matrix), reformatted per CVE. CC BY 4.0
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- yes
- Technical impact
- total
- Assessed
- 5y ago
Exploit prediction
88.78% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- Nuclei template SonicWall Email Security <= 10.0.9.x - Unauthenticated Admin Account Creation nuclei detection template
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- SonicWall Email Security
Classification
- Weakness
-
- CWE-269 Improper Privilege Management
References
-
psirt.global.sonicwall.com
/vuln-detail/SNWLID-2021-0007
vendor-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20021
government-resource, us-government-resource
Sources
- CVE List CVE-2021-20021
- NVD CVE-2021-20021
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