Password reuse is rampant: nearly half of observed user logins are compromised

Accessing private content online, whether it's checking email or streaming your favorite show, almost always starts with a “login” step. Beneath this everyday task lies a widespread human mistake we still have not resolved: password reuse. Many users recycle passwords across multiple services, creating a ripple effect of risk when their credentials are leaked.

Based on Cloudflare's observed traffic between September - November 2024, 41% of successful logins across websites protected by Cloudflare involve compromised passwords. In this post, we’ll explore the widespread impact of password reuse, focusing on how it affects popular Content Management Systems (CMS), the behavior of bots versus humans in login attempts, and how attackers exploit stolen credentials to take over accounts at scale.

As part of our Application Security offering, we offer a free feature that checks if a password has been leaked in a known data breach of another service or application on the Internet. When we perform these checks, Cloudflare does not access or store plaintext end user passwords. We have built a privacy-preserving credential checking service that helps protect our users from compromised credentials. Passwords are hashed – i.e., converted into a random string of characters Continue reading

Enhanced security and simplified controls with automated botnet protection, cipher suite selection, and URL Scanner updates

At Cloudflare, we are constantly innovating and launching new features and capabilities across our product portfolio. Today, we're releasing a number of new features aimed at improving the security tools available to our customers.

Automated security level: Cloudflare’s Security Level setting has been improved and no longer requires manual configuration. By integrating botnet data along with other request rate signals, all customers are protected from confirmed known malicious botnet traffic without any action required.

Cipher suite selection: You now have greater control over encryption settings via the Cloudflare dashboard, including specific cipher suite selection based on our client or compliance requirements.

Improved URL scanner: New features include bulk scanning, similarity search, location picker and more.

These updates are designed to give you more power and flexibility when managing online security, from proactive threat detection to granular control over encryption settings.

Cloudflare’s Security Level feature was designed to protect customer websites from malicious activity.

Available to all Cloudflare customers, including the free tier, it has always had very simple logic: if a connecting client IP address has shown malicious behavior across our network, issue a managed challenge. The system tracks malicious behavior Continue reading

Email Security now available for free for political parties and campaigns through Cloudflare for Campaigns

At Cloudflare, we believe that every political candidate — regardless of their affiliation — should be able to run their campaign without the constant worry of cyber attacks. Unfortunately, malicious actors, such as nation-states, financially motivated attackers, and hackers, are often looking to disrupt campaign operations and messaging. These threats have the potential to interfere with the democratic process, weaken public confidence, and cause operational challenges for campaigns of all scales.

In 2020, in partnership with the non-profit, non-partisan Defending Digital Campaigns (DDC), we launched Cloudflare for Campaigns to offer a free package of cybersecurity tools to political campaigns, especially smaller ones with limited resources. Since then, we have helped over 250 political campaigns and parties across the US, regardless of affiliation.

This is why we are excited to announce that we have extended our Cloudflare for Campaigns product suite to include Email Security, to secure email systems that are essential to safeguarding the integrity and success of a political campaign. By preventing phishing, spoofing, and other email threats, it helps protect candidates, staff, and supporters from cyberattacks that could compromise sensitive data.

Phishing attacks on political campaigns have been a Continue reading

Advancing account security as part of Cloudflare’s commitment to CISA’s Secure by Design pledge

In May 2024, Cloudflare signed the Cybersecurity and Infrastructure Security Agency (CISA) Secure By Design pledge. Since then, Cloudflare has been working to enhance the security of our products, ensuring that users are better protected from evolving threats. 

Today we are excited to talk about the improvements we have made towards goal number one in the pledge, which calls for increased multi-factor authentication (MFA) adoption. MFA takes many forms across the industry, from app-based and hardware key authentication, to email or SMS. Since signing the CISA pledge we have continued to iterate on our MFA options for users, and most recently added support for social logins with Apple and Google, building on the strong foundation that both of these partners offer their users with required MFA for most accounts. Since introducing social logins last year, about 25% of our users use it weekly, and it makes up a considerable portion of our MFA secured users. There’s much more to do in this space, and we are continuing to invest in more options to help secure your accounts. 

According to the 2024 Verizon Data Breach Investigations Continue reading

Conventional cryptography is under threat. Upgrade to post-quantum cryptography with Cloudflare Zero Trust

Quantum computers are actively being developed that will eventually have the ability to break the cryptography we rely on for securing modern communications. Recent breakthroughs in quantum computing have underscored the vulnerability of conventional cryptography to these attacks. Since 2017, Cloudflare has been at the forefront of developing, standardizing, and implementing post-quantum cryptography to withstand attacks by quantum computers. 

Our mission is simple: we want every Cloudflare customer to have a clear path to quantum safety. Cloudflare recognizes the urgency, so we’re committed to managing the complex process of upgrading cryptographic algorithms, so that you don’t have to worry about it. We're not just talking about doing it. Over 35% of the non-bot HTTPS traffic that touches Cloudflare today is post-quantum secure. 

The National Institute of Standards and Technology (NIST) also recognizes the urgency of this transition. On November 15, 2024, NIST made a landmark announcement by setting a timeline to phase out RSA and Elliptic Curve Cryptography (ECC), the conventional cryptographic algorithms that underpin nearly every part of the Internet today. According to NIST’s announcement, these algorithms will be deprecated by 2030 and completely disallowed by 2035.

At Cloudflare, we aren’t waiting until 2035 or even Continue reading

Chaos in Cloudflare’s Lisbon office: securing the Internet with wave motion

Over the years, Cloudflare has gained fame for many things, including our technical blog, but also as a tech company securing the Internet using lava lamps, a story that began as a research/science project almost 10 years ago. In March 2025, we added another layer to its legacy: a "wall of entropy" made of 50 wave machines in constant motion at our Lisbon office, the company's European HQ. 

These wave machines are a new source of entropy, joining lava lamps in San Francisco, suspended rainbows in Austin, and double chaotic pendulums in London. The entropy they generate contributes to securing the Internet through LavaRand.

^{The new waves wall at Cloudflare’s Lisbon office sits beside the Radar Display of global Internet insights, with the 25th of April Bridge overlooking the Tagus River in the background.}

It’s exciting to see waves in Portugal now playing a role in keeping the Internet secure, especially given Portugal’s deep maritime history.

The installation honors Portugal’s passion for the sea and exploration of the unknown, famously beginning over 600 years ago, in 1415, with pioneering vessels like caravels and naus/carracks, precursors to galleons and other ships. Portuguese sea exploration was driven by navigation schools Continue reading

Offline PKI using 3 YubiKeys and an ARM single board computer

An offline PKI enhances security by physically isolating the certificate authority from network threats. A YubiKey is a low-cost solution to store a root certificate. You also need an air-gapped environment to operate the root CA.

This post describes an offline PKI system using the following components:

• 2 YubiKeys for the root CA (with a 20-year validity),
• 1 YubiKey for the intermediate CA (with a 5-year validity), and
• 1 Libre Computer Sweet Potato as an air-gapped SBC.

It is possible to add more YubiKeys as a backup of the root CA if needed. This is not needed for the intermediate CA as you can generate a new one if the current one gets destroyed.

The software part

offline-pki is a small Python application to manage an offline PKI. It relies on yubikey-manager to manage YubiKeys and cryptography for cryptographic operations not executed on the YubiKeys. The application has some opinionated design choices. Notably, the cryptography is hard-coded to use NIST P-384 elliptic curve.

The first step is to reset all your YubiKeys:

$ offline-pki yubikey reset
This will reset the connected YubiKey. Are you sure? [y/N]: y
New PIN code:
Repeat for confirmation:
 Continue reading

Arista EOS Spooky Action at a Distance

This blog post describes yet another bizarre behavior discovered during the netlab integration testing.

It started innocently enough: I was working on the VRRP integration test and wanted to use Arista EOS as the second (probe) device in the VRRP cluster because it produces nice JSON-formatted results that are easy to use in validation tests.

Everything looked great until I ran the test on all platforms on which netlab configures VRRP, and all of them passed apart from Arista EOS (that was before we figured out how Sturgeon’s Law applies to VRRPv3) – a “That’s funny” moment that was directly responsible for me wasting a few hours chasing white rabbits down this trail.

How Cloudflare is using automation to tackle phishing head on

Phishing attacks have grown both in volume and in sophistication over recent years. Today’s threat isn’t just about sending out generic emails — bad actors are using advanced phishing techniques like 2 factor monster in the middle (MitM) attacks, QR codes to bypass detection rules, and using artificial intelligence (AI) to craft personalized and targeted phishing messages at scale. Industry organizations such as the Anti-Phishing Working Group (APWG) have shown that phishing incidents continue to climb year over year.

To combat both the increase in phishing attacks and the growing complexity, we have built advanced automation tooling to both detect and take action. 

In the first half of 2024, Cloudflare resolved 37% of phishing reports using automated means, and the median time to take action on hosted phishing reports was 3.4 days. In the second half of 2024, after deployment of our new tooling, we were able to expand our automated systems to resolve 78% of phishing reports with a median time to take action on hosted phishing reports of under an hour.

In this post we dig into some of the details of how we implemented these improvements.

Cloudflare has observed a similar Continue reading

Welcome to Security Week 2025

The layer of security around today’s Internet is essential to safeguarding everything. From the way we shop online, engage with our communities, access critical healthcare resources, sustain the worldwide digital economy, and beyond. Our dependence on the Internet has led to cyber attacks that are bigger and more widespread than ever, worsening the so-called defender’s dilemma: attackers only need to succeed once, while defenders must succeed every time.

In the past year alone, we discovered and mitigated the largest DDoS attack ever recorded in the history of the Internet – three different times – underscoring the rapid and persistent efforts of threat actors. We helped safeguard the largest year of elections across the globe, with more than half the world’s population eligible to vote, all while witnessing geopolitical tensions and war reflected in the digital world.

2025 already promises to follow suit, with cyberattacks estimated to cost the global economy $10.5 trillion in 2025. As the rapid advancement of AI and emerging technologies increases, and as threat actors become more agile and creative, the security landscape continues to drastically evolve. Organizations now face a higher volume of attacks, and an influx of more complex threats that carry real-world consequences, Continue reading

AI in Network Observability: The Dawn of Network Intelligence

Let’s face it. The modern network is a beast — a sprawling, complex organism of clouds, data centers, SaaS apps, home offices, and, depending on your industry vertical, factories, offices, retail locations, or branches. Mix in the internet as the backbone to connect them all, as well as an ever-increasing volume and velocity of data, and it becomes clear that traditional monitoring tools are now akin to peering through a keyhole to look at a vast landscape. They simply can’t see the bigger picture, and a new approach is needed: Enter Artificial Intelligence (AI), the game-changer ushering in a new era of Network Intelligence. From Reactive to Intelligent: The AI Revolution Remember the days of watching hundreds of dashboards, sifting through endless logs, and deciphering cryptic alerts? Those days are fading fast. Machine Learning and Generative AI are transforming network observability from a reactive chore to a proactive science. ML algorithms, trained on vast datasets of enriched, context-savvy network telemetry, can now detect anomalies in real-time, predict potential outages, foresee cost overruns, and even identify subtle performance degradations that would otherwise go unnoticed. Imagine an AI that can predict a spike in malicious traffic based on historical patterns and automatically Continue reading

The Root of the DNS

TNO020: Automating Network Operations with Juniper Mist (Sponsored)

AI Infrastructure Spending: Is The Boom Chemical Or Nuclear?

The IT infrastructure market is undergoing its own kind of climate change thanks to the overheating of the market due to the GenAI boom. …

AI Infrastructure Spending: Is The Boom Chemical Or Nuclear? was written by Timothy Prickett Morgan at The Next Platform.

HN772: Measuring Users’ Digital Experience with Catchpoint Internet Performance Monitoring (Sponsored)

Weekend Reads 031325

Between 2021 and 2023, the IPv4 market was a roller coaster ride—prices shot up in 2021, peaked in 2022, and plummeted in 2023. Those who expected a recovery in 2024 were sadly disappointed.

Even though most people will probably agree that software documentation is important, the topic of how to do it best is quite underdiscussed. I want to rectify this by offering some suggestions on how to do it.

Using SimpleQA, the company’s in-house factuality benchmarking tool, OpenAI admitted in its release announcement that its new large language model (LLM) GPT-4.5 hallucinates — which is AI parlance for confidently spewing fabrications and presenting them as fact — 37 percent of the time.

Colorado Attorney General Phil Weiser recently announced a coalition of 38 attorneys general and the Department of Justice have proposed a final package of remedies to end Google’s monopoly over internet search engines.

5.56 billion people are using the Internet at the start of 2025, up 136 million (2.5%) from a year earlier. This means more than two-thirds of the people on the planet are connecting to the web.

Happy Eyeballs can have some funny side effects. In a project, a connection to a Continue reading

Public Videos: Queuing Theory

The Queuing Theory webinar by Rachel Traylor is now available without a valid ipSpace.net account. Enjoy!

N4N017: Routing Fundamentals

Lip-Bu Tan: Intel’s New – And Maybe Last – CEO

In his letter to Intel employees, new chief executive officer Lip-Bu Tan, who starts his new job next Tuesday, tells them that he is “never deterred by challenges.” …

Lip-Bu Tan: Intel’s New – And Maybe Last – CEO was written by Timothy Prickett Morgan at The Next Platform.

Hedge 262: Stealthy BGP Attacks

Many providers count on detection in the global routing table to discover and counter BGP route hijacks. What if there were a kind of BGP hijack that cannot be detected using current mechanisms? Henry Birge-Lee joins Tom Ammon and Russ White to discuss a kind of stealthy BGP attack that avoids normal detection, and how we can resolve these attacks.
 
To find out more, check this RIPE video.
 

 
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