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Denial of Service

A Chinese flag flies on a high pole

Best of 2025: NOT-So-Great Firewall: China Blocks the Web for 74 Min.

Richi Jennings | December 31, 2025 | censorship, china, Denial of Service, Denial of Service (DoS) attacks, denial of service attacks, denial of service vulnerability, Denial-of-Service (DoS), Government Censorship, Great Firewall of China, HTTPS, HTTPS connection, internet censorship, online censorship, Pakistan, Peoples Republic of China, port 443, SB Blogwatch, State Censorship, TCP, TCP/IP, The Great Firewall, Transmission Control Protocol (TCP) vulnerabilities
HTTPS connections on port 443 received forged  replies. Chinese web users couldn’t access websites outside the People’s Republic yesterday. The outage lasted an hour and a quarter—with no explanation. Nobody’s sure whether it ...
Security Boulevard

Deliberate Internet Shutdowns

Bruce Schneier | December 17, 2025 | Denial of Service, Internet, Uncategorized
For two days in September, Afghanistan had no internet. No satellite failed; no cable was cut. This was a deliberate outage, mandated by the Taliban government. It followed a more localized shutdown ...
Schneier on Security

US Disrupts Massive Cell Phone Array in New York

Bruce Schneier | September 24, 2025 | cell phones, cyberattack, Denial of Service, Infrastructure, Telecom, Uncategorized
This is a weird story: The US Secret Service disrupted a network of telecommunications devices that could have shut down cellular systems as leaders gather for the United Nations General Assembly in ...
Schneier on Security
A Chinese flag flies on a high pole

NOT-So-Great Firewall: China Blocks the Web for 74 Min.

Richi Jennings | August 21, 2025 | censorship, china, Denial of Service, Denial of Service (DoS) attacks, denial of service attacks, denial of service vulnerability, Denial-of-Service (DoS), Government Censorship, Great Firewall of China, HTTPS, HTTPS connection, internet censorship, online censorship, Pakistan, Peoples Republic of China, port 443, SB Blogwatch, State Censorship, TCP, TCP/IP, The Great Firewall, Transmission Control Protocol (TCP) vulnerabilities
Xi Whiz: HTTPS connections on port 443 received forged replies ...
Security Boulevard

Largest DDoS Attack to Date

Bruce Schneier | June 23, 2025 | cyberattack, Denial of Service, Uncategorized
It was a recently unimaginable 7.3 Tbps: The vast majority of the attack was delivered in the form of User Datagram Protocol packets. Legitimate UDP-based transmissions are used in especially time-sensitive communications, ...
Schneier on Security
Cartoon of Elon Musk looking sad

No, Elon — X DDoS was NOT by Ukraine

Richi Jennings | March 12, 2025 | Cloudflare DDoS Protection, cyber attacks during ukraine war, cyber attacks russia, Dark Storm Team, ddos, DDoS attack, Denial of Service, Denial of Service (DoS) attacks, denial of service attacks, denial of service vulnerability, distributed denial of service, Distributed denial of service (DDoS) attacks, distributed denial of service attack, Elon Musk, elon musk twitter, hacktivism ukraine cyber-attacks, Russia, Russia-Ukraine, russia-ukraine conflict, Russia's War on Ukraine, SB Blogwatch, social media, Social Media Attack, social media attacks, social media cyber attacks, Social Media Cybercrime, Social Media Exploits, Ukraine, ukraine conflict, Ukraine Cyber War, Ukraine-Russia War, Ukraine/European Security, X
X marks the botnet: Outage outrage was a Ukrainian cyberattack, implies our favorite African billionaire comedy villain ...
Security Boulevard
Oracle WebLogic Server Remote Code Execution and Denial of Service Vulnerability (CVE-2025-21535/CVE-2025-21549)

Oracle WebLogic Server Remote Code Execution and Denial of Service Vulnerability (CVE-2025-21535/CVE-2025-21549)

NSFOCUS | January 23, 2025 | Blog, CVE-2025-21535, CVE-2025-21549, Denial of Service, Emergency Response, Oracle Vulnerability, Oracle WebLogic Server, Remote Code Execution
Overview Recently, NSFOCUS CERT detected that Oracle has released a security announcement, in which the remote code execution and denial of service vulnerabilities of Oracle WebLogic Server have been fixed. Affected users ...
NSFOCUS, Inc., a global network and cyber security leader, protects enterprises and carriers from advanced cyber attacks.

Robot Dog Internet Jammer

Bruce Schneier | July 24, 2024 | Denial of Service, DHS, Internet of things, law enforcement, robotics, Uncategorized
Supposedly the DHS has these: The robot, called “NEO,” is a modified version of the “Quadruped Unmanned Ground Vehicle” (Q-UGV) sold to law enforcement by a company called Ghost Robotics. Benjamine Huffman, ...
Schneier on Security
A toy “Reptar” dinosaur, from the Rugrats TV animation franchise

HALT! I am Reptar! Intel CPU Bug Panics Cloud Providers

Richi Jennings | November 15, 2023 | Cloud, Cloud IaaS, cpu, CPU attack, CPU flaw, CPU microcode, cpu vulnerability, Denial of Service, denial-of-service attack, DoS, IaaS, IaaS Security, Infrastructure as a Service (IaaS), Intel, Intel CPU, INTEL-SA-00950, Microcode Flaws, Redundant Prefix Issue, Reptar, SB Blogwatch, x86, x86_64
IaaS Catch Fire: Google and Intel fuzz, find and fix a fabulous bug. Next up: More of the same ...
Security Boulevard
What To Look for In DDoS Protection Services

What To Look for In DDoS Protection Services

Evan Morris | October 16, 2023 | Blog, ddos, Denial of Service, Security Awareness
A Sophisticated Distributed Denial-of-Service (DDoS) Attack is a cyberattack in which the perpetrator seeks to make a machine or network resource unavailable to its intended users by temporarily or indefinitely disrupting the ...
Security Archives | TechSpective
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Secure by Design

2 weeks ago | Jack Poller

Senator Sanders Wants to Own AI Companies — and Hand America’s Adversaries the Keys

3 weeks ago | Jack Poller

NIST’s Nine: The PQC Signature Race Moves to Round Three

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Press Releases

GoPlus's Latest Report Highlights How Blockchain Communities Are Leveraging Critical API Security Data To Mitigate Web3 Threats

GoPlus’s Latest Report Highlights How Blockchain Communities Are Leveraging Critical API Security Data To Mitigate Web3 Threats

C2A Security’s EVSec Risk Management and Automation Platform Gains Traction in Automotive Industry as Companies Seek to Efficiently Meet Regulatory Requirements

C2A Security’s EVSec Risk Management and Automation Platform Gains Traction in Automotive Industry as Companies Seek to Efficiently Meet Regulatory Requirements

Zama Raises $73M in Series A Lead by Multicoin Capital and Protocol Labs to Commercialize Fully Homomorphic Encryption

Zama Raises $73M in Series A Lead by Multicoin Capital and Protocol Labs to Commercialize Fully Homomorphic Encryption

RSM US Deploys Stellar Cyber Open XDR Platform to Secure Clients

RSM US Deploys Stellar Cyber Open XDR Platform to Secure Clients

ThreatHunter.ai Halts Hundreds of Attacks in the past 48 hours: Combating Ransomware and Nation-State Cyber Threats Head-On

ThreatHunter.ai Halts Hundreds of Attacks in the past 48 hours: Combating Ransomware and Nation-State Cyber Threats Head-On

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Most Read on the Boulevard

Zscaler Launches Industry-First Zero Trust Security for Agentic AI
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HackerOne Unveils Agentic AI Platform to Discover and Validate Vulnerabilities Faster
Survey: Organizations Take Too Long to Fix Application Vulnerabilities
Atomic Arch npm Campaign Adds Malicious Dependency
ServiceNow Breach Explained: API Exposure, Risks & Security
ServiceNow Discloses Security Incident Exposing Customer Data
Top 8 AI App Dev Platforms in 2026
CISA BOD 26-04: Frequently asked questions about the new risk-based patching directive

Industry Spotlight

Anthropic Mythos AI Model Strikes Fear in Trump Administration, U.S. Banks
Cloud Security Cybersecurity Data Privacy Data Security Featured Incident Response Industry Spotlight Malware Mobile Security Network Security News Security Awareness Security Boulevard (Original) Social - Facebook Social - LinkedIn Social - X Spotlight Threats & Breaches Vulnerabilities 

Anthropic Mythos AI Model Strikes Fear in Trump Administration, U.S. Banks

April 12, 2026 Jeffrey Burt | Apr 12 Comments Off on Anthropic Mythos AI Model Strikes Fear in Trump Administration, U.S. Banks
The Day the Security Music Died
AI and Machine Learning in Security Cybersecurity Featured Industry Spotlight Security Boulevard (Original) Social - Facebook Social - LinkedIn Social - X Spotlight 

The Day the Security Music Died

April 8, 2026 Alan Shimel | Apr 08 Comments Off on The Day the Security Music Died
The Lock, Not the Alarm: How Palo Alto’s Koi Acquisition Rewrites Endpoint Security
Featured Industry Spotlight Security Boulevard (Original) Social - Facebook Social - LinkedIn Social - X Spotlight Uncategorized 

The Lock, Not the Alarm: How Palo Alto’s Koi Acquisition Rewrites Endpoint Security

February 18, 2026 Jack Poller | Feb 18 Comments Off on The Lock, Not the Alarm: How Palo Alto’s Koi Acquisition Rewrites Endpoint Security

Top Stories

ServiceNow Fixes Flaw That Could Lead to Unauthorized Access to Instances
Cloud Security Cybersecurity Data Privacy Data Security Featured Identity & Access Incident Response Mobile Security Network Security News Security Awareness Security Boulevard (Original) Social - Facebook Social - LinkedIn Social - X Spotlight Vulnerabilities 

ServiceNow Fixes Flaw That Could Lead to Unauthorized Access to Instances

June 11, 2026 Jeffrey Burt | 3 days ago 0
Zscaler Launches Industry-First Zero Trust Security for Agentic AI
AI and ML in Security Cybersecurity Featured News Security Boulevard (Original) Social - Facebook Social - LinkedIn Social - X Spotlight Zero-Trust 

Zscaler Launches Industry-First Zero Trust Security for Agentic AI

June 10, 2026 Jon Swartz | 4 days ago 0
Anthropic’s Mythos Can Serve Up N-Day Exploits in Minutes or Hours
Cloud Security Cybersecurity Data Privacy Data Security Featured Incident Response Malware Mobile Security Network Security News Security Awareness Security Boulevard (Original) Social - Facebook Social - LinkedIn Social - X Spotlight Threat Intelligence Vulnerabilities 

Anthropic’s Mythos Can Serve Up N-Day Exploits in Minutes or Hours

June 9, 2026 Jeffrey Burt | Jun 09 0

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