CVE-2025-20352

Enterprises have long relied on firewalls, routers, VPN servers, and email gateways to protect their networks from attacks. Increasingly, however, these network edge devices are becoming security liabilities themselves. Every few weeks, another crisis plays out: Security teams scramble to patch and scan their network appliances for malware implants after another zero-day attack is newly […]

Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: Building a healthcare cybersecurity strategy that works In this Help Net Security interview, Wayman Cummings, CISO at Ochsner Health, talks about building a healthcare cybersecurity strategy, even when resources are tight. He explains how focusing on areas like vulnerability management and network segmentation can make the biggest difference. What Chat Control means for your privacy In this Help Net Security … More →

Threat actors have leveraged a recently patched IOS/IOS XE vulnerability (CVE-2025-20352) to deploy Linux rootkits on vulnerable Cisco network devices. “The operation targeted victims running older Linux systems that do not have endpoint detection response solutions,” Trend Micro researchers shared. Once a rootkit was implanted, it would set a universal password (containing the word “disco”) and install several hooks onto the IOSd (process) memory space, to make fileless components disappear after a reboot. About CVE-2025-20352 … More →

In newly disclosed real-world attacks, threat actors are found exploiting a Cisco Simple Network Management Protocol (SNMP) vulnerability to gain remote code execution (RCE) and install Linux rootkits on vulnerable switches. A Trend Micro investigation traced the activity, dubbed “Operation Zero Disco,” to older Cisco platforms and found the operation using spoofed IPs and MAC […]

Hackers exploit Cisco SNMP flaw CVE-2025-20352 in “Zero Disco” attacks to deploy Linux rootkits on outdated systems, researchers report. Trend Micro researchers disclosed details of a new campaign, tracked as Operation Zero Disco, that exploited a recently disclosed security flaw impacting Cisco IOS Software and IOS XE Software to deploy Linux rootkits on older, unprotected […]

Threat actors are exploiting CVE-2025-20352, a recent Cisco zero-day, to deploy a rootkit on older networking devices.

Trend™ Research has uncovered an attack campaign exploiting the Cisco SNMP vulnerability CVE-2025-20352, allowing remote code execution and rootkit deployment on unprotected devices, with impacts observed on Cisco 9400, 9300, and legacy 3750G series.

Despite Cisco and various cybersecurity agencies warning about attackers actively exploting zero-day vulnerabilities (CVE-2025-20333 and CVE-2025-20362) in Cisco Adaptive Security Appliances (ASA) for months, there are still around 48,000 vulnerable appliances out there. The number is provided by the Shadowserver Foundation, which is scanning for internet-facing vulnerable Cisco ASA/FTD instances every day. A majority of those are located in the US, and the rest mostly in the UK, Japan, Russia, Germany, and Canada. Surge in … More →

U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Adminer, Cisco IOS, Fortra GoAnywhere MFT, Libraesva ESG, and Sudo flaws to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added Adminer, Cisco IOS, Fortra GoAnywhere MFT, Libraesva ESG, and Sudo flaws to its Known Exploited Vulnerabilities (KEV) catalog. Below are the descriptions […]

The vulnerability could allow local, low-privileged attackers to execute commands with root privileges, leading to full system compromise.

Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: How Juventus protects fans, revenue, and reputation during matchdays In this Help Net Security interview, Mirko Rinaldini, Head of ICT at Juventus Football Club, discusses the club’s approach to cyber risk strategy. Juventus has developed a threat-led, outcomes-driven program that balances innovation with protections across matchdays, e-commerce, and digital platforms. Review: Practical Purple Teaming Practical Purple Teaming is a guide … More →

Network admins should quickly patch a vulnerability in Cisco Systems IOS and IOS XE software to remove a stack overflow condition in the software’s Simple Network Management Protocol (SNMP) subsystem or risk nasty attacks, say experts. “I wouldn’t delay patching,” says David Shipley, head of Canadian security awareness firm Beauceron Security, because with the release of […]

Cisco has fixed 14 vulnerabilities in IOS and IOS XE software, among them CVE-2025-20352, a high-severity vulnerability that has been exploited in zero-day attacks. About CVE-2025-20352 Cisco IOS software can be found on older models of Cisco Catalyst switches, Integrated Services Routers, and small enterprise and branch routers, as well as many legacy platforms. Cisco IOS XE software powers many of the company’s high-performance wireless controllers, routers and switches, including virtual routers and industrial networking … More →

The security defect allows remote attackers with administrative privileges to execute arbitrary code as the root user.

Cisco addressed a high-severity zero-day in Cisco IOS and IOS XE Software that is being actively exploited in attacks in the wild. Cisco fixed an actively exploited zero-day, tracked as CVE-2025-20352, impacting Cisco IOS and IOS XE Software. The high-severity vulnerability resides in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and […]

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