CVE-2021-20016
Published: November 3, 2021
Official Description
SonicWall SSLVPN SMA100 contains a SQL injection vulnerability that allows remote exploitation for credential access by an unauthenticated attacker.
CISA KEV Advisory
SonicWall SSLVPN SMA100 SQL Injection Vulnerability
SonicWall SSLVPN SMA100 contains a SQL injection vulnerability that allows remote exploitation for credential access by an unauthenticated attacker.
Apply updates per vendor instructions.
Risk Analysis
This SQL injection vulnerability in SonicWall SSLVPN SMA100 allows an unauthenticated attacker to remotely gain credential access. With an EPSS score of 0.78001 and its presence in CISA's KEV, this flaw is highly likely to be exploited and poses a critical risk to the security of VPN access.
Active exploitation of this vulnerability has been observed in the wild, confirming its critical nature. The flaw is remotely exploitable by an unauthenticated attacker, making it a severe threat.
Administrators should apply all available security updates for SonicWall SSLVPN SMA100. Implement strong authentication policies and monitor for suspicious login attempts.
Technical Analysis
CVE-2021-20016 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-2021-20016 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-2021-20016 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