@research.checkpoint.com
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Microsoft's June 2025 Patch Tuesday has addressed a total of 66 vulnerabilities across its product range, with one zero-day vulnerability, CVE-2025-33053, being actively exploited in the wild. This critical flaw exists in the Web Distributed Authoring and Versioning (WebDAV) implementation, and its exploitation could lead to remote code execution. Microsoft has issued an urgent security update to mitigate this threat, even for outdated systems like Windows Server 2008 and components of the long-retired Internet Explorer. The urgency of this patch is underscored by the ongoing exploitation of the vulnerability by the Stealth Falcon APT group.
The actively exploited zero-day, CVE-2025-33053, poses a significant risk because attackers can achieve remote code execution at the local level simply by tricking a user into following a malicious link. This vulnerability has been exploited since March 2025 by Stealth Falcon, a hacking group known for targeted attacks in the Middle East. Researchers at Check Point discovered the flaw being used against a Turkish defense company, where malware was inserted to facilitate data exfiltration and the installation of a custom keylogger. The attack involves a .url file disguised as a PDF, which, when clicked, redirects to a WebDAV server controlled by the attacker, causing a legitimate Windows diagnostic tool to execute a malicious file.
Alongside the actively exploited zero-day, Microsoft's June 2025 Patch Tuesday addresses a range of other vulnerabilities, including ten that are rated as "Critical". Another notable flaw, CVE-2025-33073, affects the Windows Server Message Block (SMB) client and could allow attackers to gain SYSTEM privileges. This vulnerability is considered less likely to be exploited but can be mitigated by enforcing server-side SMB signing via Group Policy. The updates also include fixes for vulnerabilities in Microsoft Office, .NET, Visual Studio, and other products, highlighting the breadth of the security update.
References :
- isc.sans.edu: Microsoft today released patches for 67 vulnerabilities. 10 of these vulnerabilities are rated critical. One vulnerability has already been exploited and another vulnerability has been publicly disclosed before today.
- BleepingComputer: Microsoft June 2025 Patch Tuesday fixes exploited zero-day, 66 flaws
- Tenable Blog: Microsoft’s June 2025 Patch Tuesday Addresses 65 CVEs (CVE-2025-33053)
- cyberinsider.com: Microsoft's June 2025 Patch Tuesday addresses 66 vulnerabilities across its product suite, including a high-severity zero-day in the WebDAV service that is currently being exploited in the wild.
- securityonline.info: Stealth Falcon Exploits New Zero-Day (CVE-2025-33053) in Sophisticated Cyberespionage Campaign
- Cisco Talos Blog: Microsoft Patch Tuesday for June 2025 — Snort rules and prominent vulnerabilities
- borncity.com: Summarizes the Microsoft security updates for June 10, 2025, noting the zero-day classification.
- Threats | CyberScoop: Microsoft Patch Tuesday addresses 66 vulnerabilities, including an actively exploited zero-day
- hackread.com: June 2025 Patch Tuesday: Microsoft Fixes 66 Bugs, Including Active 0-Day
- CyberInsider: Summary of the June 2025 Patch Tuesday release.
- research.checkpoint.com: Check Point Research discovered a new campaign conducted by the APT group Stealth Falcon. The attack used a .url file that exploited a zero-day vulnerability (CVE-2025-33053) to execute malware from an actor-controlled WebDAV server.
- gbhackers.com: Microsoft Patch Tuesday June 2025 – 66 Vulnerabilities Patched Including 2 Zero-Day
- cyberscoop.com: Reports on Microsoft patching 66 vulnerabilities, including an actively exploited zero-day.
- bsky.app: This month, Microsoft patched 67 vulnerabilities, including one actively exploited zero-days—CVE-2025-33053, a WebDAV RCE discovered by Check Point
- gbhackers.com: Microsoft Windows WebDAV 0-Day RCE Vulnerability Actively Exploited in The Wild
- www.helpnetsecurity.com: Microsoft fixes zero-day exploited for cyber espionage (CVE-2025-33053)
- Kaspersky official blog: CVE-2025-33053: RCE in WebDAV | Kaspersky official blog
- thehackernews.com: Microsoft Patches 67 Vulnerabilities Including WEBDAV Zero-Day Exploited in the Wild
- blog.checkpoint.com: Inside Stealth Falcon’s Espionage Campaign Using a Microsoft Zero-Day
- Check Point Blog: Inside Stealth Falcon's Espionage Campaign Using a Microsoft Zero-Day
- securityonline.info: Stealth Falcon Exploits New Zero-Day (CVE-2025-33053) in Sophisticated Cyberespionage Campaign
- Blog: Microsoft’s June addressed 66 vulnerabilities. Notably, one of them has been actively exploited, and one other has been publicly disclosed.
- go.theregister.com: Microsoft warns of 66 flaws to fix for this Patch Tuesday, and two are under active attack
- arcticwolf.com: Arctic Wolf's blog covering the June 2025 Microsoft Patch Tuesday, mentioning CVE-2025-33053.
- socprime.com: A new critical zero-day RCE vulnerability in Microsoft Windows, tracked as CVE-2025-33053, has been actively exploited by the Stealth Falcon (aka FruityArmor) APT group. The flaw leads to RCE by manipulating the system’s working directory.
- www.bleepingcomputer.com: An APT hacking group known as 'Stealth Falcon' exploited a Windows WebDav RCE vulnerability in zero-day attacks since March 2025 against defense and government organizations in Turkey, Qatar, Egypt, and Yemen.
- arcticwolf.com: Arctic Wolf observes that Microsoft Patch Tuesday: June 2025 includes CVE-2025-33053.
- Virus Bulletin: Check Point Research discovered a new campaign conducted by the APT group Stealth Falcon. The attack used a .url file that exploited a zero-day vulnerability (CVE-2025-33053) to execute malware from an actor-controlled WebDAV server.
- borncity.com: Microsoft Security Update Summary (June 10, 2025)
- www.threatdown.com: June 2025 Microsoft Patch Tuesday fixes two zero-days
- Arctic Wolf: Microsoft Patch Tuesday: June 2025
- Help Net Security: Microsoft fixes zero-day exploited for cyber espionage (CVE-2025-33053)
- thecyberexpress.com: Microsoft Patch Tuesday June 2025: One Zero-Day, Nine High-risk Flaws Fixed
- infosecwriteups.com: (CVE-2025-33053) New 0-Day in WebDAV Exposes Servers to Remote Code Execution  —  Here’s What You…
- Action1: June 2025 Vulnerability Digest Recording
- 0patch Blog: Micropatches Released for WEBDAV Remote Code Execution Vulnerability (CVE-2025-33053)
- Check Point Research: CVE-2025-33053, Stealth Falcon and Horus: A Saga of Middle Eastern Cyber Espionage
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@msrc.microsoft.com
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Microsoft has released its May 2025 Patch Tuesday updates, addressing a total of 71 or 72 vulnerabilities, depending on the source, across its software. This includes fixes for five actively exploited zero-day vulnerabilities and two publicly known vulnerabilities. The updates target flaws in various Windows components, including the Windows Common Log File System (CLFS), DWM Core Library, Scripting Engine, and Winsock.
Among the critical issues addressed are elevation of privilege (EoP) and remote code execution (RCE) vulnerabilities. Specifically, two zero-days in the CLFS (CVE-2025-32701 and CVE-2025-32706) allow attackers to gain SYSTEM privileges. Another zero-day (CVE-2025-30400) is a use-after-free vulnerability in the Windows Desktop Window Manager (DWM) Core Library, which can also lead to privilege escalation. A scripting engine memory corruption vulnerability (CVE-2025-30397) could allow for remote code execution if a user visits a malicious web page while using Internet Explorer mode in Edge.
The Cybersecurity and Infrastructure Security Agency (CISA) has added all five exploited vulnerabilities to its Known Exploited Vulnerabilities Catalog, urging administrators to patch these flaws by June 3, 2025. Security experts emphasize the importance of prioritizing these updates to prevent potential privilege escalation, code execution, and other malicious activities. The identified vulnerabilities highlight the ongoing risk posed by CLFS exploitation and the need for continuous monitoring and patching efforts.
References :
- borncity.com: Microsoft Security Update Summary (May 13, 2025)
- Threats | CyberScoop: Microsoft’s Patch Tuesday closes 72 vulnerabilities, including 5 zero-days
- isc.sans.edu: Microsoft Patch Tuesday: May 2025, (Tue, May 13th)
- Tenable Blog: Microsoft’s May 2025 Patch Tuesday Addresses 71 CVEs (CVE-2025-32701, CVE-2025-32706, CVE-2025-30400)
- CyberInsider: Microsoft Patches Five Actively Exploited Flaws in May 2025 Windows 11 Update
- securityaffairs.com: Microsoft Patch Tuesday security updates for May 2025 fixed 5 actively exploited zero-days
- www.bleepingcomputer.com: Microsoft May 2025 Patch Tuesday fixes 5 exploited zero-days, 72 flaws
- The Hacker News: Microsoft Fixes 78 Flaws, 5 Zero-Days Exploited; CVSS 10 Bug Impacts Azure DevOps Server
- krebsonsecurity.com: Patch Tuesday, May 2025 Edition
- socradar.io: May 2025 Patch Tuesday: 78 Flaws, 5 Exploited, & Critical SAP Fixes
- thecyberexpress.com: Microsoft Patch Tuesday May 2025: 5 Zero Days, 8 High-Risk Vulnerabilities
- www.action1.com: May 2025 Vulnerability Digest Recording
- Blog RSS Feed: May 2025 Patch Tuesday Analysis
- Action1: Watch this webinar to explore the latest Microsoft patches from May 2025 Patch Tuesday and updates on third-party application vulnerabilities addressed in the past month.
- www.computerworld.com: May’s Patch Tuesday serves up 78 updates, including 5 zero-day fixes
- borncity.com: Microsoft confirms Bitlocker boot problems after Windows 10/11 May 2025 update
- cyberpress.org: KB5058379 Windows 10 Patch Causes Boot Failures, Demands BitLocker Unlock
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