The US-CERT Current Activity web page is a regularly updated summary of the most frequent, high-impact types of security incidents currently being reported to the US-CERT.

RSS feed for current activities

Ivanti Updates Log4j Advisory with Security Updates for Multiple Products  

Ivanti has updated its Log4j Advisory with security updates for multiple products to address CVE-2021-44228. An unauthenticated attacker could exploit this vulnerability to take control of an affected system.

Juniper Networks Releases Security Updates for Multiple Products

Juniper Networks has released security updates to address vulnerabilities affecting multiple products. An attacker could exploit some of these vulnerabilities to take control of an affected system.

CISA encourages users and administrators to review the Juniper Networks security advisories page and apply the necessary updates.

Citrix Releases Security Updates for Hypervisor 

Citrix has released security updates to address vulnerabilities in Hypervisor. An attacker could exploit these vulnerabilities to cause a denial-of-service condition.

CISA encourages users and administrators to review Citrix Security Update CTX335432 and apply the necessary updates.

Apple Releases Security Updates for iOS and iPadOS

Apple has released security updates to address a vulnerability affecting iOS 15.2.1 and iPadOS 15.2.1. An attacker could exploit this vulnerability to cause a denial-of-service condition. 

CISA encourages users and administrators to review the Apple security page for iOS 15.2.1 and iPadOS 15.2.1 and apply the necessary updates.

Cisco Releases Security Updates for Multiple Products

Cisco has released security updates to address a vulnerability affecting Cisco Unified Contact Center Management Portal (Unified CCMP) and Cisco Unified Contact Center Domain Manager (Unified CCDM). A remote attacker could exploit this vulnerability to take control of an affected system. 

CISCA encourages users and administrators to review Cisco Security Advisory cisco-sa-ccmp-priv-esc-JzhTFLm4 and apply the necessary updates.
 

CNMF Identifies and Discloses Malware used by Iranian APT MuddyWater

U.S. Cyber Command’s Cyber National Mission Force (CNMF) has identified multiple open-source tools used by an Iranian advanced persistent threat (APT) group known as MuddyWater. According to CNMF, “MuddyWater has been seen using a variety of techniques to maintain access to victim networks. These include side-loading DLLs in order to trick legitimate programs into running malware and obfuscating PowerShell scripts to hide command and control functions.” U.S. Cyber Command has released malware samples attributed to MuddyWater to the malware aggregation tool and repository, VirusTotal.