CVE-2021-20038

9.8CRITICAL

Key Information

Vendor
Sonicwall
Status
Sonicwall Sma100
Vendor
CVE Published:
8 December 2021

Badges

👾 Exploit Exists🔴 Public PoC🟣 EPSS 95%

Summary

A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticated attacker to potentially execute code as a 'nobody' user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances firmware 10.2.0.8-37sv, 10.2.1.1-19sv, 10.2.1.2-24sv and earlier versions.

CISA Reported

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2021-20038 as being exploited and is known by the CISA as enabling ransomware campaigns.

The CISA's recommendation is: Apply updates per vendor instructions.

Affected Version(s)

SonicWall SMA100 = 10.2.0.8-37sv and earlier

SonicWall SMA100 = 10.2.1.1-19sv and earlier

SonicWall SMA100 = 10.2.1.2-24sv and earlier

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

badblood
Created by jbaines-r7

CVE-2021-20038-SonicWall-RCE
Created by vesperp

EPSS Score

95% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit exists.

  • Vulnerability published.

  • Vulnerability Reserved.

Collectors

NVD DatabaseMitre DatabaseCISA Database2 Proof of Concept(s)
.