CVE-2021-20023 kev+ ransomware in the critical feed json
SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on t…
published 2021-04-20 5 y ago modified 2026-10-01 38 d ago also EUVD-2021-7486
- cvss
- 4.9
- version 3.1, CNA
- cisa kev
- Exploited
- added 2021-11-03, used in ransomware
- epss
- 51.7%
- EPSS 51.7% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known
Summary
SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host.
Patch / fix
cisa required action Apply updates per vendor instructions.
- sonicwall email_security 10.0.9.6173
- sonicwall email_security_virtual_appliance 10.0.9.6177
- sonicwall hosted_email_security 10.0.9.6173
- sonicwall email_security_appliance_9000_firmware 10.0.9.6177
- sonicwall email_security_appliance_3300_firmware 10.0.9.6177
- sonicwall email_security_appliance_4300_firmware 10.0.9.6177
- sonicwall email_security_appliance_8300_firmware 10.0.9.6177
- sonicwall email_security_appliance_5000_firmware 10.0.9.6177
- sonicwall email_security_appliance_7000_firmware 10.0.9.6177
- sonicwall email_security_appliance_5050_firmware 10.0.9.6177
- sonicwall email_security_appliance_7050_firmware 10.0.9.6177
Timeline
- Published
- Added to CISA KEV
- CISA patch deadline
- CISA SSVC: exploitation active
Known exploited
- Added
- 5 y ago
- Patch by
- 2021-11-17 (4 y 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 Path Traversal 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
- 2 mo ago
Exploit prediction
51.69% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N |
| NVD | 3.1 | 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N |
| CNA | 3.1 | 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:P/I:N/A:N |
Affected products
- SonicWall Email Security
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
psirt.global.sonicwall.com
/vuln-detail/SNWLID-2021-0010
vendor-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20023
government-resource, us-government-resource
Sources
- CVE List CVE-2021-20023
- NVD CVE-2021-20023
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.