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Windows Defender

All articles tagged with #windows defender

security1 day ago•2 min saved

Microsoft backs coordinated vulnerability disclosure after researcher’s zero-day spill

Microsoft pressed for Coordinated Vulnerability Disclosure after Chaotic Eclipse exposed multiple Windows zero-days (BlueHammer, RedSun, UnDefend, YellowKey, among others), with several exploits already in the wild. The company says uncoordinated disclosures risk customers and impeded timely fixes, while promoting dialogue within the security community. GitHub reportedly removed the researcher’s account amid the flare-up, and exploit code briefly appeared on GitLab before the account was blocked. The researcher has warned of a July 14, 2026 release, signaling ongoing tensions between researchers and vendors over disclosure practices.

via The Hacker News|

#coordinated-vulnerability-disclosure #cybersecurity #github

technology1 month ago•4 min saved

Rogue researcher releases second Windows Defender exploit, threatens more RCEs

A rogue researcher, Nightmare-Eclipse, released a second Windows Defender privilege-escalation exploit (RedSun) after Microsoft patched the first CVE-2026-33825 vulnerability. The PoC allegedly lets unprivileged users gain SYSTEM privileges by abusing Defender to overwrite system files; the researcher warns of more remote code execution exploits to come. Microsoft patched the flaw on Patch Tuesday and credited Zen Dodd and Yuanpei Xu, while the researcher continues to air grievances and threaten further disclosures.

via Cybernews|

#exploit #microsoft #privilege-escalation

technology1 year ago•2 min saved

December Patch Tuesday: Critical Windows Vulnerabilities Demand Immediate Updates

Microsoft has confirmed a critical security vulnerability in Windows Defender, identified as CVE-2024-49071, which could have allowed unauthorized access to sensitive data across a network. Despite the severity, users are not required to take any action as Microsoft has already mitigated the issue server-side. This approach aligns with Microsoft's new transparency policy on server-side vulnerabilities, ensuring users are informed without needing to install updates themselves.

via Forbes|

#cve-2024-49071 #data-disclosure #microsoft

cybersecurity2 years ago•3 min saved

"Urgent: Windows Security Flaw Exposes Data to Hackers - Take Action Now"

Hackers are exploiting a high-severity vulnerability in Windows SmartScreen to spread the Phemedrone info-stealing malware, bypassing security warnings and potentially compromising user data. Updating Windows with the latest security patches is crucial to protect against this threat, as hackers are using trusted cloud services and URL shorteners to disguise malicious files. Users are advised to be cautious when downloading files and to stick to trusted sources, as hackers may exploit compromised accounts to spread malware. While the SmartScreen flaw has been patched, vigilance and regular software updates are essential to stay safe from evolving cyber threats.

via Tom's Guide|

#cybersecurity #malware #phishing

cybersecurity2 years ago•3 min saved

Windows malware spread through Super Mario game

A trojanized installer for the popular Super Mario 3: Mario Forever game for Windows is infecting users with multiple malware infections, including an XMR miner and an information stealer called Umbral Stealer. The malware is likely promoted on gaming forums or social media groups and is distributed through unknown channels. Users should scan their computers for malware, reset passwords at sensitive sites, and download software only from official sources.

via BleepingComputer|

#cybersecurity #information-stealer #malware

technology3 years ago•1 min saved

Microsoft Fixes 5-Year-Old Windows Defender Bug Causing CPU Spikes on Firefox

A CPU bug affecting Firefox users on Windows was actually the fault of Windows Defender's MsMpEng.exe, which handles the Real-Time protection feature that monitors web activity for malicious threats. The bug was causing Firefox to call on the service much more frequently than comparable browsers like Chrome or Edge, resulting in notable CPU spikes. The latest update to Windows Defender addresses the issue, resulting in measurably lower CPU usage for the Windows version of Firefox.

via Slashdot|

#cpu-bug #firefox #mozilla

technology3 years ago•2 min saved

Microsoft resolves 5-year-old Windows Defender bug impacting Firefox performance.

Microsoft has released a bug-fixing update to its Windows Defender antimalware application that resolves a five-year-old issue that was negatively affecting Firefox users during their web browsing sessions. The issue was caused by the Antimalware Service Executable component of Defender (MsMpEng.exe) that was executing a high number of calls to the OS kernel's VirtualProtect function while tracing Windows events (ETW). This was using five times the CPU power with Firefox compared to other browsers. The recent update for Defender's antimalware engine provides a massive ~75% improvement in CPU usage while browsing the web with Firefox.

via TechSpot|

#bug-fix #cpu-usage #firefox

technology3 years ago•1 min saved

Microsoft resolves 5-year-old Windows Defender bug impacting Firefox performance.

Microsoft has finally fixed a five-year-old bug related to Windows Defender and its Antimalware Service Executable (MsMpEng.exe) service that caused high CPU usage on Mozilla Firefox. The bug was resolved by the efforts of Microsoft and the Mozilla development team, and the fix is now available for all users as part of regular definition updates. The bug did not affect Windows 7 and 8.1 users. There is further scope for improvements to the processor usage in Firefox when compared to Chrome.

via Neowin|

#cpu-bug #firefox #microsoft