Path Traversal in Microsoft Windows
CVE-2021-20023
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.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.514 (98.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Microsoft Windows
- Sonicwall Email Security — versions 10.0.9 and earlier
- Sonicwall Email_security
- Sonicwall Email_security_appliance_3300
- Sonicwall Email_security_appliance_3300_firmware
- Sonicwall Email_security_appliance_4300
- Sonicwall Email_security_appliance_4300_firmware
- Sonicwall Email_security_appliance_5000
- Sonicwall Email_security_appliance_5000_firmware
- Sonicwall Email_security_appliance_5050
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Known ransomware campaign use: yes.
Public proof-of-concept exploits
References
- PSIRT@sonicwall.com (x_refsource_CONFIRM, Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2021-20023?
- CVE-2021-20023 is a medium-severity vulnerability in Microsoft Windows, classified under Path Traversal. CVSS score: 4.9/10. Published 2021-04-20.
- How severe is CVE-2021-20023?
- Medium severity. CVSS v3 base score is 4.9 out of 10.
- Is CVE-2021-20023 known to be exploited?
- Yes. CVE-2021-20023 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.