CISA Adds One Known Exploited Vulnerability to Catalog

CISA has added CVE-2025-53521, a critical F5 BIG-IP Remote Code Execution vulnerability, to its Known Exploited Vulnerabilities (KEV) Catalog due to evidence of active exploitation. This RCE flaw represents a significant risk to federal enterprise networks and is frequently targeted by malicious cyber actors. Under BOD 22-01, Federal Civilian Executive Branch agencies are required to remediate this vulnerability by the specified due date. While the directive applies specifically to FCEB agencies, CISA strongly recommends all organizations prioritize timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practices. The active exploitation status makes immediate patching critical for any organization running affected F5 BIG-IP implementations.

CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2025-53521 F5 BIG-IP Remote Code Execution Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the BOD 22-01 Fact Sheet for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria .

CISA has added CVE-2025-53521, a critical F5 BIG-IP Remote Code Execution vulnerability, to its Known Exploited Vulnerabilities (KEV) Catalog due to evidence of active exploitation. This RCE flaw represents a significant risk to federal enterprise networks and is frequently targeted by malicious cyber actors. Under BOD 22-01, Federal Civilian Executive Branch agencies are required to remediate this vulnerability by the specified due date. While the directive applies specifically to FCEB agencies, CISA strongly recommends all organizations prioritize timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practices. The active exploitation status makes immediate patching critical for any organization running affected F5 BIG-IP implementations. CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2025-53521 F5 BIG-IP Remote Code Execution Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the BOD 22-01 Fact Sheet for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria . CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2025-53521 F5 BIG-IP Remote Code Execution Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the BOD 22-01 Fact Sheet for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria .