Malicious Process Environment Block Manipulation The process environment block contains metadata about particular processes, but can be manipulated. https://isc.sans.edu/diary/Malicious+Process+Environment+Block+Manipulation/32614/ YARA-X 1.11.0 Release: Hash Function Warnings The latest version of YARA will warn users if a hash rule attempts to match an invalid hash. https://isc.sans.edu/diary/YARA-X%201.11.0%20Release%3A%20Hash%20Function%20Warnings/32616 VideoLAN Security Bulletin VLC 3.0.22 CVE-2025-51602 Read More

Analysis using Gephi with DShield Sensor Data Gephi is a neat tool to create interactive data visualizations. It can be applied to honeypot data to find data clusters. https://isc.sans.edu/diary/Analysis%20using%20Gephi%20with%20DShield%20Sensor%20Data/32608 zlib v1.3.1.2 Global Buffer Overflow in TGZfname() of zlib untgz Utility The untgz utility that is part of zlib suffers from Read More

A phishing campaign with QR codes rendered using an HTML table Phishing emails are bypassing filters by encoding QR codes as HTML tables. https://isc.sans.edu/diary/A%20phishing%20campaign%20with%20QR%20codes%20rendered%20using%20an%20HTML%20table/32606 n8n vulnerabilities In recent days, several new n8n vulnerabilities were disclosed. Ensure that you update any on-premises installations and carefully consider what to use n8n for. Read More

Tool Review: Tailsnitch Tailsnitch is a tool to audit your Tailscale configuration. It does a comprehensive analysis of your configuration and suggests (or even applies) fixes. https://isc.sans.edu/diary/Tool%20Review%3A%20Tailsnitch/32602 D-Link DSL Command Injection via DNS Configuration Endpoint A new vulnerability in very old D-Link DSL modems is currently being exploited. https://www.vulncheck.com/advisories/dlink-dsl-command-injection-via-dns-configuration-endpoint TOTOLINK Read More

Risks of OOB Access via IP KVM Devices Recently, cheap IP KVMs have become popular. But their deployment needs to be secured. https://isc.sans.edu/diary/Risks%20of%20OOB%20Access%20via%20IP%20KVM%20Devices/32598 Tailsnitch Tailsnitch is a tool to review your Tailscale configuration for vulnerabilities https://github.com/Adversis/tailsnitch Net-SNMP snmptrapd vulnerability A new vulnerability in snmptrapd may lead to remote code execution Read More

Cryptocurrency Scam Emails and Web Pages As We Enter 2026 Scam emails are directing victims to confidence scams attempting to steal cryptocurrencies. https://isc.sans.edu/diary/Cryptocurrency%20Scam%20Emails%20and%20Web%20Pages%20As%20We%20Enter%202026/32594 Debugging DNS response times with tshark tshark is a powerful tool to debug DNS timing issues. https://isc.sans.edu/diary/Debugging+DNS+response+times+with+tshark/32592/ Old Fortinet Devices Have not been updated Over 10,000 Fortinet Read More

MongoDB Unauthenticated Attacker Sensitive Memory Leak CVE-2025-14847 Over the Christmas holiday, MongoDB patched a sensitive memory leak vulnerability that is now actively being exploited https://www.mongodb.com/community/forums/t/important-mongodb-patch-available/332977 https://github.com/mongodb/mongo/commit/505b660a14698bd2b5233bd94da3917b585c5728 https://www.ox.security/blog/attackers-could-exploit-zlib-to-exfiltrate-data-cve-2025-14847/ https://github.com/joe-desimone/mongobleed/

DLLs & TLS Callbacks As a follow-up to last week's diary about DLL Entrypoints, Didier is looking at TLS ( Thread Local Storage ) and how it can be abused. https://isc.sans.edu/diary/DLLs%20%26%20TLS%20Callbacks/32580 FreeBSD Remote code execution via ND6 Router Advertisements A critical vulnerability in FreeBSD allows for remote code execution. But Read More

Positive trends related to public IP range from the year 2025 Fewer ICS systems, as well as fewer systems with outdated SSL versions, are exposed to the internet than before. The trend isn t quite clean for ISC, but SSL2 and SSL3 systems have been cut down by about half. Read More

Maybe a Little Bit More Interesting React2Shell Exploit Attackers are branching out to attack applications that initial exploits may have missed. The latest wave of attacks is going after less common endpoints and attempting to exploit applications that do not have Next.js exposed. https://isc.sans.edu/diary/Maybe%20a%20Little%20Bit%20More%20Interesting%20React2Shell%20Exploit/32578 UAT-9686 actively targets Cisco Secure Email Read More

Beyond RC4 for Windows authentication Microsoft outlined its transition plan to move away from RC4 for authentication and published guidance and tools to facilitate this change. https://www.microsoft.com/en-us/windows-server/blog/2025/12/03/beyond-rc4-for-windows-authentication FortiCloud SSO Login Vuln Exploited Arctic Wolf observed exploit attempts against vulnerable FortiGate appliances. https://arcticwolf.com/resources/blog/arctic-wolf-observes-malicious-sso-logins-following-disclosure-cve-2025-59718-cve-2025-59719/ FrePBX Vulnerability Horizon3.ai identified three distinct vulnerabilities in Read More

More React2Shell Exploits CVE-2025-55182 Our honeypots continue to detect numerous React2Shell variants. Some using slightly modified exploits https://isc.sans.edu/diary/More%20React2Shell%20Exploits%20CVE-2025-55182/32572 The Fragile Lock: Novel Bypasses For SAML Authentication SAML is a tricky protocol to implement correctly, in particular if different XML parsers are used that may not always agree on how to Read More

Abusing DLLs EntryPoint for the Fun DLLs will not just execute code when some of their functions are called, but also as they are loaded. https://isc.sans.edu/diary/Abusing%20DLLs%20EntryPoint%20for%20the%20Fun/32562 Apple Patches Everything: December 2025 Edition Apple released patches for all of its operating systems, fixing two already exploited vulnerabilities. ClickFix Attacks Still Using Read More

Using AI Gemma 3 Locally with a Single CPU Installing AI models on modes hardware is possible and can be useful to experiment with these models on premise https://isc.sans.edu/diary/Using%20AI%20Gemma%203%20Locally%20with%20a%20Single%20CPU%20/32556 Mystery Google Chrome 0-Day Vulnerability Google released an update for Google Chrome fixing a vulnerability that is already being exploited, but Read More

Possible exploit variant for CVE-2024-9042 (Kubernetes OS Command Injection) We observed HTTP requests with our honeypot that may be indicative of a new version of an exploit against an older vulnerability. Help us figure out what is going on. https://isc.sans.edu/diary/Possible%20exploit%20variant%20for%20CVE-2024-9042%20%28Kubernetes%20OS%20Command%20Injection%29/32554 React2Shell: Technical Deep-Dive & In-the-Wild Exploitation of CVE-2025-55182 Wiz has Read More

Microsoft Patch Tuesday Microsoft released its regular monthly patch on Tuesday, addressing 57 flaws. https://isc.sans.edu/diary/Microsoft%20Patch%20Tuesday%20December%202025/32550 Adobe Patches Adobe patched five products. The remote code execution in ColdFusion, as well as the code execution issue in Acrobat, will very likely see exploits soon. https://helpx.adobe.com/security.html Ivanti Endpoint Manager Patches Ivanti patched four Read More

nanoKVM Vulnerabilities The nanoKVM device updates firmware insecurely; however, the microphone that the authors of the advisory referred to as undocumented may actually be documented in the underlying hardware description. https://www.tomshardware.com/tech-industry/cyber-security/researcher-finds-undocumented-microphone-and-major-security-flaws-in-sipeed-nanokvm Ghostframe Phishing Kit The Ghostframe phishing kit uses iFrames and random subdomains to evade detection https://blog.barracuda.com/2025/12/04/threat-spotlight-ghostframe-phishing-kit WatchGuard Advisory WatchGuard Read More

AutoIT3 Compiled Scripts Dropping Shellcodes Malicious AutoIT3 scripts are usign the FileInstall function to include additional scripts at compile time that are dropped as temporary files during execution. https://isc.sans.edu/diary/AutoIT3%20Compiled%20Scripts%20Dropping%20Shellcodes/32542 React2Shell Update The race is on to patch vulnerable systems. Various groups are aggressively scanning the internet with different exploit variants. Read More

Nation-State Attack or Compromised Government? [Guest Diary] An IP address associated with the Indonesian Government attacked one of our interns' honeypots. https://isc.sans.edu/diary/Nation-State%20Attack%20or%20Compromised%20Government%3F%20%5BGuest%20Diary%5D/32536 React Update Working exploits for the React vulnerability patched yesterday are not widely available Array Networks Array AG Vulnerablity A recently patched vulnerability in Array Networks Array AG Read More

Attempts to Bypass CDNs Our honeypots recently started receiving scans that included CDN specific headers. https://isc.sans.edu/diary/Attempts%20to%20Bypass%20CDNs/32532 React Vulnerability CVE-2025-55182 React patched a critical vulnerability in React server components. Exploitation is likely imminent. https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components Unveiling 3 PickleScan Vulnerabilities The PyTorch AI model security tool, PickleScan, has patched three critical vulnerabilities. https://jfrog.com/blog/unveiling-3-zero-day-vulnerabilities-in-picklescan/