CISA has added a new vulnerability to its Known Exploited Vulnerabilities Catalog, which is based on evidence of active exploitation. The vulnerability is CVE-2021-20035, a SonicWall SMA100 Appliances OS Command Injection Vulnerability. This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. The Known Exploited Vulnerabilities Catalog was established by Binding Operational Directive (BOD) 22-01 to reduce the risk of known vulnerabilities. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect their networks against active threats. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to prioritize timely remediation of Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria. The Catalog is a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. FCEB agencies must remediate identified vulnerabilities by the due date to comply with BOD 22-01. By prioritizing remediation, organizations can reduce their exposure to cyberattacks and protect their networks against active threats.