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:
- UK MoD says no data leaked to China via drone vulnerability
August 10, 2026
Britain’s Ministry of Defence said on Monday that there is no evidence that military data was compromised after a cyber vulnerability was discovered in Royal Navy drones. The issue was identified during routine cybersecurity testing, the ministry said, adding that it continues to conduct security checks across its equipment and systems. Read more… Source: EUROACTIV Sign up for the ...
- Swiss government says SharePoint-linked data breach affected hundreds of accounts
August 7, 2026
Cybercriminals broke into the IT network of the Swiss government and stole data from roughly 200 accounts. As a result, the Swiss government disconnected some of its servers from the wider internet and launched an investigation. In an announcement, the Swiss government said that on July 28 2026 its security specialists noticed “abnormalities” in the Federal ...
- Apple’s Private Relay tool can leak users’ IP addresses
August 6, 2026
WebKit, Apple’s engine that powers all web browsers in its ecosystem, contained multiple flaws that helped leak the IP addresses of users who paid to keep them hidden. This is according to security researchers Talal Haj Bakry and Tommy Mysk who noted they had found “three WebKit features that bypass the proxy configuration and send traffic directly from the ...
- TP-Link router owners update now — 15 flaws patched to stop hackers hijacking your devices
August 5, 2026
TP-Link has patched more than a dozen vulnerabilities across multiple business networking products which could have been chained to achieve remote code execution (RCE). Security researchers at Vedere Labs from Forescout found the flaws and published an in-depth report on the issues, which particularly affect TP-Link Omada, the company’s business networking platform for centrally managing enterprise and small-business ...
- Cybercriminals allegedly hacked tens of thousands of Fortinet firewalls used by major companies all over the world
June 17, 2026
Cybercriminals have compromised tens of thousands of Fortinet firewalls and VPNs used by major companies all over the world, according to two cybersecurity firms. The widespread hacking campaign, which is ongoing and has been dubbed FortiBleed, appears to not involve abusing any unknown vulnerability in the targeted devices, but rather on a more basic issue: Companies ...
- CISA gives US federal agencies three days to fix a VPN bug under attack by a ransomware gang
June 9, 2026
A ransomware group is actively exploiting an unpatched flaw in security tools used across the U.S. federal government, prompting the U.S. cybersecurity agency CISA to order all civilian agencies to remediate the vulnerability by end of day Wednesday. Cybersecurity firm Check Point Software said the bug affects several of its remote access tools, firewalls, and VPNs, which act as ...