denial-of-service Archives

Winsage

August 16, 2026

LeakWatch CW 33/2026: Windows Zero-Day, AMD, Intel and Malware

- The August Patch Tuesday release included 421 vulnerabilities, with 236 affecting Windows, highlighting CVE-2026-68820, a critical use-after-free vulnerability that allows privilege escalation to SYSTEM level without user interaction. - CISA added CVE-2026-68820 to its Known Exploited Vulnerabilities Catalog, confirming its active exploitation. - AMD's Ryzen Master software has vulnerabilities, including CVE-2025-54512 (DLL hijacking) and CVE-2026-0465 (use-after-free), which could allow code execution with elevated privileges. - AMD's advisory on CVE-2026-6726 and CVE-2026-6727 indicates vulnerabilities in the TPM 2.0 reference code affecting Ryzen platforms, leading to potential information disclosure. - Intel's advisories included updates for microcode, Wi-Fi software, and NPU drivers, with CVE-2026-20760 addressing privilege escalation risks. - Google’s Chrome update on August 11 fixed five high-severity vulnerabilities, including use-after-free flaws. - Gunra malware has evolved into a ransomware-as-a-service model using a double-extortion strategy. - WindRelay malware combines SpyNote RAT with an NFC relay component, allowing attackers to relay NFC communication between a victim's bank card and a remote device. - The findings emphasize the need to view vulnerabilities as part of potential attack chains, highlighting the complexity of modern cybersecurity threats.

AppWizard

August 14, 2026

Threema messenger says DDoS attacks disrupted its service for two days

Threema experienced significant disruptions due to large-scale DDoS attacks, rendering the service inaccessible for several hours on Tuesday and causing intermittent outages on Wednesday morning. The attacks targeted both Threema and its Swiss colocation partner, Nine, with service being unavailable from 7:30 p.m. to 11:30 p.m. CEST on Tuesday. By 12:23 p.m. on Wednesday, normal operations were restored. The security of Threema's systems and user data remained intact despite the service availability issues. The nature of the attacks made mitigation challenging, as attackers modified their methods rapidly. Threema's status page faced issues during the outage, and communication was conducted via email and social media. In response, Threema is implementing specialized upstream DDoS protection and plans to enhance its status page to provide monitoring for future disruptions.

Winsage

July 14, 2026

Microsoft Just Patched a Record 570 Flaws in Windows

Microsoft's July Patch Tuesday update addresses 570 vulnerabilities, including three critical zero-days. The vulnerabilities include 254 elevation-of-privilege flaws, 17 security feature bypasses, 145 remote-code-execution issues, 102 information disclosures, 16 spoofing vulnerabilities, and 35 denial-of-service vulnerabilities. Among these, 59 bugs are classified as "critical." The three zero-days patched are CVE-2026-56155 (elevation of privilege in Active Directory Federation Services), CVE-2026-56164 (elevation of privilege in Microsoft SharePoint Server), and CVE-2026-50661 (security bypass in Windows BitLocker). The update is recommended to be installed as soon as possible, and users can check for updates through the Windows Update settings.

Winsage

June 11, 2026

Microsoft Patches Record 206 Flaws, Including Three Zero-Days and Critical RCE Bugs

Microsoft announced an update addressing 206 security vulnerabilities, including 39 classified as Critical and 167 as Important. The vulnerabilities include 63 privilege escalation, 56 remote code execution, 30 information disclosure, 27 spoofing, 20 security feature bypass, 7 denial-of-service, and 3 tampering vulnerabilities. Notable critical flaws include CVE-2026-45657 (use-after-free in Windows Kernel, CVSS score 9.8), CVE-2026-47291 (integer overflow in Windows HTTP.sys, CVSS score 9.8), and CVE-2026-44815 (stack-based buffer overflow in Windows DHCP Client, CVSS score 9.8). Microsoft also addressed vulnerabilities related to BitLocker bypass (CVE-2026-45585 and CVE-2026-50507) and introduced a new registry setting to mitigate risks associated with CVE-2026-49160 (denial-of-service vulnerability). The increase in patches is attributed to the use of artificial intelligence in vulnerability discovery, with the current year's reported vulnerabilities surpassing the total from all of 2018.

Winsage

June 10, 2026

Microsoft’s biggest-ever Patch Tuesday fixes 206 bugs, including 3 zero-days

Microsoft's recent Patch Tuesday release addressed 206 security vulnerabilities, marking the largest update since the program began in October 2003. Among these, 32 vulnerabilities are classified as critical, including three zero-day vulnerabilities that were disclosed before patches were available, though none are reported to be actively exploited. Notable vulnerabilities include: - CVE-2026-50507 in Windows BitLocker, with a CVSS score of 6.8, allowing unauthorized bypass of security features through physical attacks. - CVE-2026-49160 in HTTP.sys, with a CVSS score of 7.5, which can be exploited for remote denial-of-service attacks. - CVE-2026-45586 in the Windows Collaborative Translation Framework (CTFMON), with a CVSS score of 7.8, which could grant SYSTEM privileges to attackers.

Winsage

June 10, 2026

Microsoft patches record 198 Windows bugs in June update – and 3 are zero days

Microsoft's latest Patch Tuesday addressed 198 security vulnerabilities, the most extensive update in recent memory. Among these, 32 flaws are classified as critical, and three are zero-day vulnerabilities. The updates are detailed in KB articles: KB5094126 for Windows 11 versions 24H2 and 25H2, KB5093998 for version 23H2, and KB5094127 for Windows 10. The updates will automatically download and install, but users must verify their installation status and reboot their computers for changes to take effect. The vulnerabilities addressed this month are attributed to advancements in artificial intelligence, with companies like Microsoft leveraging AI models to expedite the identification and resolution of security flaws. The three zero-day vulnerabilities include one that allows an attacker to gain Windows System privileges through a flaw in file link resolution, another that could facilitate a denial-of-service attack via an HTTP vulnerability, and a third related to a flaw in Windows BitLocker that could enable data capture from an unpatched PC. Additionally, the update introduces new features to Windows 11, including new Secure Boot certificates, a Low Latency Profile for enhanced performance, support for shared audio devices for multiple Bluetooth connections, webcam functionality across multiple applications, and the ability to assign a custom name to the user folder during setup.

Winsage

June 1, 2026

Windows Server vulnerability can grant system privileges with just a malformed packet — domain controllers are being exploited in the wild

Microsoft is facing scrutiny due to a critical remote execution vulnerability, CVE-2026-41089, rated at 9.8, affecting Windows Server domain controllers from version 2012 onward. This vulnerability allows unauthenticated users on the same network to send malformed UDP packets to a domain controller, potentially granting unauthorized system access or causing a reboot, leading to denial-of-service scenarios. The vulnerable service is Netlogon, and there are no immediate mitigations available; patches will be released on May 12. The vulnerability could allow attackers to create multiple accounts with various access levels, compromising the security of entire networks. Cybersecurity experts recommend patching all linked domain controllers simultaneously. The vulnerability is caused by a buffer overflow in the Netlogon service due to a field in a network packet exceeding its expected size. A GitHub repository exists with proof-of-concept code that can crash the LSASS service. Additionally, Microsoft is in conflict with security researcher Chaotic Eclipse, who has published zero-day exploits following a breakdown in negotiations.

Winsage

May 23, 2026

Microsoft Windows Дефендер тизимидаги хавфли заифликларни бартараф этди

Microsoft has identified two significant vulnerabilities in Windows Defender, specifically related to the Malware Protection Engine, which could allow denial-of-service attacks. These vulnerabilities could destabilize the security mechanism of Windows. Microsoft has released patches in versions 1.1.26040.8 and 4.18.26040.7 of the Malware Protection Engine to address these issues. Users with automatic updates enabled will receive these patches without further action, but it is recommended that users manually check for updates in the Windows Security settings. There is currently no evidence that these vulnerabilities have been exploited in real-world scenarios.

Tech Optimizer

May 21, 2026

Nvidia tells users to update GPU drivers now or face possible attack — here’s what we know

NVIDIA has released an update to its GPU display drivers that addresses 14 vulnerabilities across its product lines, including GeForce, RTX, Quadro, Tesla, NVS, vGPU, and Cloud Gaming software. The most critical vulnerability is CVE‑2026‑24187, a high-severity use-after-free bug rated 8.8 out of 10, which could allow code execution, privilege escalation, data theft, or system crashes. Linux systems are vulnerable due to improper access to GPU resources at the kernel level, while Windows systems are at risk from a timing flaw. Two vulnerabilities in NVIDIA’s Unified Virtual Memory subsystem on Linux could lead to denial-of-service attacks without elevated permissions. The vGPU software also received patches for vulnerabilities in its virtual GPU manager component. Users can download the updated drivers from the NVIDIA Driver Downloads page or the NVIDIA Licensing Portal, with Windows users needing version 569.49 or newer and Linux users needing version 590.48.01. Users are advised to maintain their antivirus programs for enhanced security. NVIDIA thanked external security researchers for their responsible disclosure of these vulnerabilities.

Tech Optimizer

May 21, 2026

PostgreSQL Flaws Expose Databases to Remote Code Execution and SQL Injection

PostgreSQL has released versions 18.4, 17.10, 16.14, 15.18, and 14.23 to address 11 security vulnerabilities and over 60 bugs. The vulnerabilities affect PostgreSQL versions 14 through 18 and include issues such as remote code execution, SQL injection, and denial-of-service risks. Specific vulnerabilities include: - CVE-2026-6472: Missing authorization in CREATE TYPE allows query hijacking. - CVE-2026-6473: Integer wraparound leads to out-of-bounds writes and server crashes. - CVE-2026-6474: Format string issue leaks server memory. - CVE-2026-6475: Symlink attack allows overwriting arbitrary files. - CVE-2026-6476: SQL injection allows execution of arbitrary SQL as superuser. - CVE-2026-6477: Memory buffer overwrite via libpq lo_* functions. - CVE-2026-6478: Timing attack exposes MD5-hashed passwords. - CVE-2026-6479: SSL/GSS recursion flaw allows denial-of-service. - CVE-2026-6575: Buffer over-read leaks memory data (PostgreSQL 18 only). - CVE-2026-6637: Refint module enables stack overflow and SQL injection, leading to possible RCE. - CVE-2026-6638: SQL injection in REFRESH PUBLICATION via table names. Organizations are advised to upgrade to the latest versions, avoid MD5 password authentication, restrict privileges, audit extensions, and monitor for abnormal activity. PostgreSQL 14 will reach its end-of-life on November 12, 2026.