A brief daily summary of what is important in information security. The podcast is published every weekday and designed to get you ready for the day with a brief, usually 5 minute long, summary of current network security related events. The content is late breaking, educational and based on listener input as well as on input received by the SANS Internet Stormcenter. You may submit questions and comments via our contact form at https://isc.sans.edu/contact.html .
SANS Stormcast Wednesday, January 21st, 2026: Punycode Hunting; telnetd vuln; 6 day Certs and IP Certs; Oracle Patches
January 20, 2026
6:44
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Add Punycode to your Threat Hunting Routine
Punycode patterns in DNS queries make excellent hunting opportunities.
https://isc.sans.edu/diary/Add%20Punycode%20to%20your%20Threat%20Hunting%20Routine/32640
GNU InetUtils Security Advisory: remote authentication by-pass intelnetd
telnetd shipping with InetUtils suffers from a critical authentication by-pass vulnerability.
https://www.openwall.com/lists/oss-security/2026/01/20/2
6-day and IP Address Certificates are Generally Available
Let s Encrypt will now offer 6-day certificates as an option. These short-lived certificates can be used for IP addresses.
https://letsencrypt.org/2026/01/15/6day-and-ip-general-availability
Oracle Quarterly Critical Patch Update
Oracle released its first quarterly patches for 2026, fixing 337 vulnerabilities
https://www.oracle.com/security-alerts/cpujan2026.html#AppendixFMW