CVE-2021-20038
Published: January 28, 2022
Official Description
SonicWall SMA 100 devies are vulnerable to an unauthenticated stack-based buffer overflow vulnerability where exploitation can result in code execution.
CISA KEV Advisory
SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability
SonicWall SMA 100 devies are vulnerable to an unauthenticated stack-based buffer overflow vulnerability where exploitation can result in code execution.
Apply updates per vendor instructions.
Risk Analysis
SonicWall SMA 100 devices are vulnerable to an unauthenticated stack-based buffer overflow, which can lead to code execution. The high EPSS score of 0.94292 indicates a very high likelihood of exploitation, requiring immediate attention.
This vulnerability has been observed under active exploitation in the wild and is part of CISA's KEV catalog. It is remotely exploitable without authentication.
Apply the latest firmware updates and patches for SonicWall SMA 100 devices. Ensure proper input validation is in place to prevent buffer overflows.
Technical Analysis
CVE-2021-20038 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2021-20038 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-20038 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1