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astra

Critical React2Shell RCE Hits React and Next.js (CVE-2025-55182 / CVE-2025-66478)

Dec 19, 2025 By Sanskriti Jain In Astra
React2Shell is a severe remote, unauthenticated RCE vulnerability recently uncovered in React Server Components (RSC) and the Next.js App Router — tracked as CVE-2025-55182, with CVE-2025-66478 later merged as a duplicate — that allows attackers to execute arbitrary code on servers by exploiting insecure Flight protocol deserialization (CWE-502), earning the flaw a maximum CVSS score of 10.0.
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Corelight

Detecting CVE-2025-20393 exploitation: catching UAT-9686 on Cisco appliances

Dec 19, 2025 By David Burkett In Corelight
CVE-2025-20393 is a CVSS 10.0 Remote Code Execution (RCE) flaw in Cisco Secure Email Gateways currently being actively exploited by China-nexus groups. A recent advisory from Cisco Talos details how an actor dubbed “UAT-9686” is leveraging this vulnerability to target Cisco Secure Email Gateways (ESA) and Secure Email and Web Managers (SMA). The attack allows threat actors to execute arbitrary commands with root privileges and deploy persistence mechanisms.
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Arctic Wolf

CVE-2025-20393: Threat Campaign Targeting Cisco Secure Email Gateway, Cisco Secure Email and Web Manager

Dec 19, 2025 By Julian Tuin In Arctic Wolf
On December 17, 2025, Cisco published an advisory detailing a new threat campaign identified on December 10, affecting the Cisco AsyncOS software used on Cisco Secure Email Gateway and Cisco Secure Email and Web Manager. The campaign is exploiting an unpatched zero-day vulnerability, which only affects deployments with the Spam Quarantine feature enabled. It allows threat actors to execute arbitrary commands with root privileges on affected devices. This feature is not enabled by default.
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Bug bounties and broken CVEs with Bryan Brake

Dec 19, 2025 By LimaCharlie In LimaCharlie
Join us for this week's Defender Fridays as we explore bug bounty programs, vulnerability management, and the complexities of the CVE system with Brian Break, a veteran security professional with twenty years of experience across endpoint security, consulting, and product security. At Defender Fridays, we delve into the dynamic world of information security, exploring its defensive side with seasoned professionals from across the industry. Our aim is simple yet ambitious: to foster a collaborative space where ideas flow freely, experiences are shared, and knowledge expands.
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Arctic Wolf

CVE-2025-14733: WatchGuard Firebox iked Out of Bounds Write Vulnerability Exploited in the Wild

Dec 19, 2025 By Andres Ramos In Arctic Wolf
On December 18, 2025, WatchGuard released fixes for CVE-2025-14733, a critical out-of-bounds write vulnerability in the Internet Key Exchange daemon (iked) process used to establish VPN tunnels in Fireware OS, which powers Firebox firewall appliances. Exploitation of this vulnerability allows a remote, unauthenticated threat actor to execute arbitrary code. WatchGuard has confirmed in-the-wild exploitation in their advisory.
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bitsight

CVE-2025-55182: First Days of React2Shell Exploitations

Dec 18, 2025 By João Godinho In BitSight
On December 3rd Lachlan Davidson disclosed an unauthenticated remote code execution vulnerability in React Server Components (RSC) that exploits how React.js (and Next.js) decodes payloads sent to React Server Function endpoints. On December 4th we started observing fingerprinting attempts for these vulnerabilities and on December 5th we started observing exploitation attempts. React.js is used by 66% of the global digital supply, in the top 0.06% of all technologies.
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foresiet

Lazarus Group (APT38 / APT-C-26) Exploits WinRAR Vulnerability CVE-2025-8088 for Archive Poisoning Attacks

Dec 18, 2025 By Foresiet In Foresiet
During routine threat research and monitoring of Chinese-language underground distribution channels, our team identified a malicious RAR archive. Specifically, this archive abuses a critical WinRAR directory traversal vulnerability to achieve arbitrary file write and persistence on Windows systems. To accomplish this, the archive leverages a combination of NTFS Alternate Data Streams (ADS) and directory traversal logic.
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nucleus

Looking Ahead to 2026: Why Cyber Economics Will Redefine the CISO's Mandate

Dec 18, 2025 By Jeff Gouge In Nucleus
Cybersecurity in 2026 will be driven by economics. Not hype. Not novelty. Economics. Attackers follow financial incentives and scale their operations faster than most enterprises can defend. CISOs must shift from reporting technical metrics to explaining business impact, guide safe AI adoption as Shadow AI grows, and design programs that emphasize resilience over perfection.
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