In late July 2025, Arctic Wolf observed an increase in ransomware activity targeting SonicWall firewall devices for initial access. In the intrusions reviewed, multiple pre-ransomware intrusions were observed within a short period of time, each involving VPN access through SonicWall SSL VPNs.
While credential access through brute force, dictionary attacks, and credential stuffing have not yet been definitively ruled out in all cases, available evidence points to the existence of a zero-day vulnerability. In some instances, fully patched SonicWall devices were affected following credential rotation. Despite TOTP MFA being enabled, accounts were still compromised in some instances.
Read more…
Source: Arctic Wolf
Sign up for the Cyber Security Review Newsletter
The latest cyber security news and insights delivered right to your inbox
Related:
- Hackers hijacked hundreds of devices in an outlandish intel campaign aimed at US and Asian targets
June 29, 2025
A recently disclosed cyber espionage operation, dubbed LapDogs, has drawn scrutiny following revelations from SecurityScorecard’s Strike Team. The operation, believed to be conducted by China-aligned threat actors, has quietly infiltrated over 1,000 devices across the United States, Japan, South Korea, Taiwan, and Hong Kong. What makes this campaign distinctive is its use of hijacked SOHO routers ...
- Active Exploitation of Zero-Day Vulnerability CVE-2025-6543 in NetScaler ADC and NetScaler Gateway
June 26, 2025
Citrix has released a critical security bulletin addressing a vulnerability affecting NetScaler ADC (formerly Citrix ADC) and NetScaler Gateway (formerly Citrix Gateway). Citrix NetScaler is an all-in-one load balancer, web application firewall (WAF), virtual private network (VPN) gateway and SSL offloading tool for web applications. CVE-2025-6543 is a ‘memory overflow’ vulnerability with a CVSSv4 base score of ...
- Canadian Centre for Cyber Security/FBI: People’s Republic of China cyber threat activity
June 20, 2025
The Canadian Centre for Cyber Security (Cyber Centre) and the United States’ Federal Bureau of Investigation (FBI) are warning Canadians of the threat posed by People’s Republic of China (PRC) state-sponsored cyber threat actor tracked in industry reporting as Salt Typhoon. The Cyber Centre previously joined our partners in warning that PRC cyber actors have compromised ...
- Toxic trend: Another malware threat targets DeepSeek
June 11, 2025
DeepSeek-R1 is one of the most popular LLMs right now. Users of all experience levels look for chatbot websites on search engines, and threat actors have started abusing the popularity of LLMs. kaspersky previously reported attacks with malware being spread under the guise of DeepSeek to attract victims. The malicious domains spread through X posts and ...
- Cisco Releases Security Advisory Affecting Cisco Identity Service Engine
June 5, 2025
Cisco has released software updates for its Identity Service Engine (ISE). The updates address a critical severity vulnerability in the ISE product. Cisco Identity Services Engine (ISE) is a context-aware policy service to control access and threats across wired, wireless, and VPN networks. CVE-2025-20286 has a CVSSv3 score of 9.9 and is a “use of hard-coded ...
- Multiple vulnerabilities in SonicWall SMA 100 series (FIXED)
May 7, 2025
In April of 2025, Rapid7 discovered and disclosed three new vulnerabilities affecting SonicWall Secure Mobile Access (“SMA”) 100 series appliances (SMA 200, 210, 400, 410, 500v). These vulnerabilities are tracked as CVE-2025-32819, CVE-2025-32820, and CVE-2025-32821. An attacker with access to an SMA SSLVPN user account can chain these vulnerabilities to make a sensitive system directory writable, ...