Windows users, it’s time to hunker down and pay attention: a new zero-day vulnerability has been confirmed that puts your NTLM credentials at risk. As reported by Forbes, this vulnerability affects a broad range of Windows systems—from the venerable Windows 7 and Server 2008 R2 to the latest Windows 11 (v24H2) and even Server 2025. While Microsoft hasn’t yet released an official fix, security researchers have already offered an interim solution that you might want to consider, especially if you rely on your computer for critical work.
Key points include:
• The exploit takes advantage of vulnerabilities within the NTLM protocol—Microsoft’s authentication system.
• The attack vector requires the user to merely view a crafted file, making it a stealthy and dangerous threat.
• While not categorized as “critical” in the traditional sense, these NTLM vulnerabilities have been used in real-world attacks, underscoring their significance.
Even if the vulnerability isn’t labeled as critical, the implications are far-reaching; misused NTLM credentials can lead to relay attacks, pass-the-hash scenarios, and a broader compromise of your network. The timing couldn’t be worse, with many organizations still running on legacy systems alongside the modern ones.
How does it work?
• The 0patch solution acts like an in-memory patch, analyzing processes on the fly without disturbing system operations.
• These patches are free and available until Microsoft releases an official security update, meaning you can plug the vulnerability hole quickly and efficiently.
• By applying a micropatch, you circumvent the vulnerability’s exploitation risk while waiting for the next Patch Tuesday or an urgent out-of-band update.
This temporary fix illustrates how the security community is stepping up to protect users, leveraging innovative workarounds in the interim. It’s a classic case of “better safe than sorry”—especially when the path from vulnerability discovery to vulnerability exploitation can be alarmingly short.
Here’s what you need to know:
• The vulnerability, tracked as CVE-2025-2783, involves an “incorrect handle provided in unspecified circumstances” within the Mojo function, a key component of the browser’s inter-process communication framework.
• The exploit is notably insidious—it requires only a single click from a targeted phishing message to bypass Chrome’s sandbox protection.
• Kaspersky’s researchers observed a “wave of infections” triggered by this vulnerability, emphasizing that even a brief interaction can lead to a significant breach of security.
The exploitation of browser vulnerabilities showcases the broader threat landscape and the cunning techniques employed by attackers. Windows users who rely on web-based applications should update their browsers immediately and heed security advisories from both browser vendors and independent cybersecurity firms.
Consider the following:
• Historical Context
Windows has faced its fair share of zero-day vulnerabilities over the years. Each incident serves as a stark reminder that security is an ongoing process, not a one-time fix.
• Emerging Threats
With attackers continuously evolving their techniques—exploiting everything from legacy protocols like NTLM to complex inter-process frameworks in modern browsers—the cybersecurity landscape is more dynamic and challenging than ever.
• The Role of the Security Community
Initiatives like those of ACROS Security and their micropatch approach highlight an essential facet of cybersecurity: sometimes, the best protection is provided by independent researchers who innovate rapidly when official patching lags behind.
These insights drive home the point that a reactive posture is no longer viable. Instead, users need to adopt layered security strategies that anticipate and address potential breaches before they can cause harm.
As the security community rallies to address this threat, it’s a stark reminder that in our interconnected world—even a seemingly minor flaw can have far-reaching implications. Keep your systems updated, remain skeptical of unusual files or links, and always be ready to embrace temporary solutions when the threat landscape shifts beneath your feet.
Remember, when it comes to cybersecurity, proactive measures and informed decisions are your best allies. Stay secure, stay alert, and keep an eye on trusted sources like WindowsForum.com for all the latest updates and expert advice on safeguarding your digital life.
Source: Forbes Windows Passwords At Risk As New 0-Day Confirmed—Act Now
What’s Happening with Windows Security?
A message from Mitja Kolsek, CEO of ACROS Security, arrives at a time when Windows zero-days have been an unsettling headline on our screens. The crux of the issue is that a malicious file, if simply viewed in Windows Explorer, can trigger an exploit that enables an attacker to extract NTLM (NT LAN Manager) credentials. This may sound like something out of a cyber-thriller, but in reality, it highlights how an attacker can quietly steal your Windows password hashes with minimal effort.Key points include:
• The exploit takes advantage of vulnerabilities within the NTLM protocol—Microsoft’s authentication system.
• The attack vector requires the user to merely view a crafted file, making it a stealthy and dangerous threat.
• While not categorized as “critical” in the traditional sense, these NTLM vulnerabilities have been used in real-world attacks, underscoring their significance.
Even if the vulnerability isn’t labeled as critical, the implications are far-reaching; misused NTLM credentials can lead to relay attacks, pass-the-hash scenarios, and a broader compromise of your network. The timing couldn’t be worse, with many organizations still running on legacy systems alongside the modern ones.
The Interim Fix: Patching the Gap with Micropatches
Since Microsoft has yet to issue an official patch, Mitja Kolsek and his team at ACROS Security have stepped in. They’re offering a set of free micropatches through 0patch—an ingenious temporary fix designed for these windows of vulnerability.How does it work?
• The 0patch solution acts like an in-memory patch, analyzing processes on the fly without disturbing system operations.
• These patches are free and available until Microsoft releases an official security update, meaning you can plug the vulnerability hole quickly and efficiently.
• By applying a micropatch, you circumvent the vulnerability’s exploitation risk while waiting for the next Patch Tuesday or an urgent out-of-band update.
This temporary fix illustrates how the security community is stepping up to protect users, leveraging innovative workarounds in the interim. It’s a classic case of “better safe than sorry”—especially when the path from vulnerability discovery to vulnerability exploitation can be alarmingly short.
A Ripple Through the Ecosystem: Zero-Day Vulnerabilities Beyond Windows
It isn’t just Windows at risk. In a related development, security researchers from Kaspersky’s GReAT have uncovered another zero-day exploit impacting Chromium-based browsers like Google Chrome and Microsoft Edge on Windows.Here’s what you need to know:
• The vulnerability, tracked as CVE-2025-2783, involves an “incorrect handle provided in unspecified circumstances” within the Mojo function, a key component of the browser’s inter-process communication framework.
• The exploit is notably insidious—it requires only a single click from a targeted phishing message to bypass Chrome’s sandbox protection.
• Kaspersky’s researchers observed a “wave of infections” triggered by this vulnerability, emphasizing that even a brief interaction can lead to a significant breach of security.
The exploitation of browser vulnerabilities showcases the broader threat landscape and the cunning techniques employed by attackers. Windows users who rely on web-based applications should update their browsers immediately and heed security advisories from both browser vendors and independent cybersecurity firms.
Why You Should Take Immediate Action
In today's fluid environment of cybersecurity threats, waiting for a vendor fix is becoming a risky proposition. Here are a few best practices for protecting yourself against these zero-day exploits:- Install Interim Micropatches
• If you haven’t already, consider applying the free 0patch micropatch provided by ACROS Security. This short-term fix is specifically designed to cover the vulnerability until Microsoft issues an official update. - Update Your Software Regularly
• Ensure that your Windows OS is up-to-date with all the latest security patches.
• Update your web browsers—Google Chrome, Microsoft Edge, and any other Chromium-based browser—to the newest version to mitigate browser-based vulnerabilities. - Exercise Caution with Suspicious Files and Links
• Avoid opening files from untrusted sources that may be designed to exploit systems via Windows Explorer.
• Be vigilant about clicking on short or cryptic links, particularly in unsolicited emails or messages. - Enhance Your Network Defenses
• Employ multi-factor authentication (MFA) wherever possible; relying solely on NTLM credentials can prove hazardous.
• Utilize advanced endpoint protection solutions and consider isolating legacy systems from sensitive parts of your network until updates are applied. - Monitor Security Advisories
• Keeping an eye on updates from trusted security sources (including our regular WindowsForum.com updates) can help you stay ahead of emerging threats.
• Regularly review official communications from Microsoft regarding new patches and updates in response to these vulnerabilities.
The Bigger Picture: A Wake-Up Call for Cybersecurity
This new zero-day adversary isn’t an isolated incident—it’s part of a troubling trend. The increased frequency of zero-day vulnerabilities in both core Windows components and additional software like web browsers points to an ecosystem under siege. As threat actors continue to leverage minor yet potent vulnerabilities, it’s essential for both end users and IT professionals to adopt a proactive approach to security.Consider the following:
• Historical Context
Windows has faced its fair share of zero-day vulnerabilities over the years. Each incident serves as a stark reminder that security is an ongoing process, not a one-time fix.
• Emerging Threats
With attackers continuously evolving their techniques—exploiting everything from legacy protocols like NTLM to complex inter-process frameworks in modern browsers—the cybersecurity landscape is more dynamic and challenging than ever.
• The Role of the Security Community
Initiatives like those of ACROS Security and their micropatch approach highlight an essential facet of cybersecurity: sometimes, the best protection is provided by independent researchers who innovate rapidly when official patching lags behind.
These insights drive home the point that a reactive posture is no longer viable. Instead, users need to adopt layered security strategies that anticipate and address potential breaches before they can cause harm.
In Conclusion
The latest zero-day vulnerability putting Windows NTLM credentials at risk serves as a clarion call for vigilance. Although it may not immediately cripple systems, the ability to stealthily bypass authentication and potentially compromise networks is a risk that no Windows user should take lightly. Until Microsoft delivers an official fix, applying free micropatches and staying up-to-date with the latest browser and OS updates are the best defenses available.As the security community rallies to address this threat, it’s a stark reminder that in our interconnected world—even a seemingly minor flaw can have far-reaching implications. Keep your systems updated, remain skeptical of unusual files or links, and always be ready to embrace temporary solutions when the threat landscape shifts beneath your feet.
Remember, when it comes to cybersecurity, proactive measures and informed decisions are your best allies. Stay secure, stay alert, and keep an eye on trusted sources like WindowsForum.com for all the latest updates and expert advice on safeguarding your digital life.
Source: Forbes Windows Passwords At Risk As New 0-Day Confirmed—Act Now
