Author Archives: Alexander Leonov

About Alexander Leonov

Hi! My name is Alexander and I am a Vulnerability Management specialist. You can read more about me here. Currently, the best way to follow me is my Telegram channel @avleonovcom. I update it more often than this site. If you haven't used Telegram yet, give it a try. It's great. You can discuss my posts or ask questions at @avleonovchat. А всех русскоязычных я приглашаю в ещё один телеграмм канал @avleonovrus, первым делом теперь пишу туда.

December Microsoft Patch Tuesday

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December Microsoft Patch Tuesday

December Microsoft Patch Tuesday. A total of 56 vulnerabilities were fixed – 9 fewer than in November. There is one vulnerability with confirmed in-the-wild exploitation:

🔻 EoP – Windows Cloud Files Mini Filter Driver (CVE-2025-62221)

There are currently no vulnerabilities with publicly available exploits. Among the remaining vulnerabilities, the following stand out:

🔹 RCE – Microsoft Office (CVE-2025-62554, CVE-2025-62557), Microsoft PowerShell (CVE-2025-54100), Microsoft Outlook (CVE-2025-62562), GitHub Copilot for JetBrains (CVE-2025-64671)
🔹 EoP – Windows Win32k (CVE-2025-62458), Windows Cloud Files Mini Filter Driver (CVE-2025-62454, CVE-2025-62457), Windows Common Log File System Driver (CVE-2025-62470), Windows Remote Access Connection Manager (CVE-2025-62472), Windows Storage (CVE-2025-59516)

🗒 Full Vulristics report

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About Elevation of Privilege – Windows Kernel (CVE-2025-62215) vulnerability

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About Elevation of Privilege - Windows Kernel (CVE-2025-62215) vulnerability

About Elevation of Privilege – Windows Kernel (CVE-2025-62215) vulnerability. The vulnerability was addressed in the November Microsoft Patch Tuesday. Exploitation of this vulnerability allows a local attacker to gain SYSTEM privileges. The root cause of the vulnerability is a Race Condition (CWE-362) and a Double Free (CWE-415).

⚙️ Updates are available for Windows 10/11 and Windows Server 2019/2022/2025.

👾 Microsoft reported active exploitation of the vulnerability in attacks on November 11 as part of MSPT, and the following day the vulnerability was added to the CISA KEV catalog. No details about the attacks have been disclosed so far.

🛠 Public exploits have been available on GitHub since November 18.

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About SQL Injection – Django (CVE-2025-64459) vulnerability

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About SQL Injection - Django (CVE-2025-64459) vulnerability

About SQL Injection – Django (CVE-2025-64459) vulnerability. Django is a free and open-source high-level Python web framework. The vulnerability allows attackers to manipulate database query logic by injecting internal query parameters (_connector and _negated) when applications pass user-controlled input directly into filter(), exclude(), or get() calls. Exploiting this SQL injection may lead to unauthorized access to data, authentication bypass, or privilege escalation.

⚙️ The vulnerability was patched in Django versions 5.2.8, 5.1.14, and 4.2.26, released on November 5, 2025. Earlier unsupported versions of Django (such as 5.0.x, 4.1.x, and 3.2.x) were not tested and may be vulnerable.

🛠 A public exploit for the vulnerability appeared on November 6.

👾 No active exploitation has been reported so far.

🌐 According to 6sense, Django holds 32% of the web framework market share and is used by more than 42,000 companies. Ful.io tracks over 2.9 million websites running Django.

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November Linux Patch Wednesday

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November Linux Patch Wednesday

November Linux Patch Wednesday. In November, Linux vendors began fixing 516 vulnerabilities, one and a half times fewer than in October. Of these, 232 are in the Linux Kernel. One vulnerability is exploited in the wild:

🔻 MemCor – Chromium (CVE-2025-13223). Added to CISA KEV on November 19.

For 64 more vulnerabilities, public or suspected exploits exist. Notable ones:

🔸 RCE – Samba (CVE-2025-10230), Apache Tomcat (CVE-2025-55752), NVIDIA Container Toolkit (CVE-2024-0132, CVE-2025-23359), Lasso (CVE-2025-47151), QuickJS (CVE-2025-62494), Keras (CVE-2025-9905)
🔸 SQLi – Django (CVE-2025-64459)
🔸 InfDisc – Webmin (CVE-2024-44762), Squid (CVE-2025-62168), BIND (CVE-2025-31133), QuickJS (CVE-2025-62492, CVE-2025-62493)
🔸 SFB – BIND (CVE-2025-40778)
🔸 AuthBypass – Webmin (CVE-2025-61541)
🔸 MemCor – Suricata (CVE-2025-59150)

🗒 Full Vulristics report

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November “In the Trend of VM” (#21): vulnerabilities in Windows, SharePoint, Redis, XWiki, Zimbra Collaboration, and Linux

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November In the Trend of VM (#21): vulnerabilities in Windows, SharePoint, Redis, XWiki, Zimbra Collaboration, and Linux

November “In the Trend of VM” (#21): vulnerabilities in Windows, SharePoint, Redis, XWiki, Zimbra Collaboration, and Linux. The usual monthly roundup. After several months, here’s a big one. 🔥

🗞 Post on Habr (rus)
🗞 Post on SecurityLab (rus)
🗒 Digest on the PT website (rus)

A total of nine vulnerabilities:

🔻 RCE – Windows Server Update Services (WSUS) (CVE-2025-59287)
🔻 RCE – Microsoft SharePoint “ToolShell” (CVE-2025-49704)
🔻 RCE – Windows LNK File (CVE-2025-9491)
🔻 EoP – Windows Remote Access Connection Manager (CVE-2025-59230)
🔻 EoP – Windows Agere Modem Driver (CVE-2025-24990)
🔻 RCE – Redis “RediShell” (CVE-2025-49844)
🔻 RCE – XWiki Platform (CVE-2025-24893)
🔻 XSS – Zimbra Collaboration (CVE-2025-27915)
🔻 EoP – Linux Kernel (CVE-2025-38001)

🟥 Trending Vulnerabilities Portal

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November Microsoft Patch Tuesday

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November Microsoft Patch Tuesday

November Microsoft Patch Tuesday. A total of 65 vulnerabilities. I’m not comparing this with the October report because I’ve decided to cover only MSPT-day vulnerabilities. The thing is, Microsoft has started massively adding Linux-product vulnerabilities to their official website, and these clutter the “extended” MSPT reports. 🤷‍♂️

There is one vulnerability with evidence of in-the-wild exploitation:

🔻 EoP – Windows Kernel (CVE-2025-62215)

No vulnerabilities have publicly available exploits yet. Notable ones include:

🔹 RCE – GDI+ (CVE-2025-60724), Microsoft Office (CVE-2025-62199), Microsoft Office (CVE-2025-62205, CVE-2025-62216), Agentic AI and Visual Studio Code (CVE-2025-62222), Visual Studio (CVE-2025-62214)
🔹 EoP – Windows Client-Side Caching (CVE-2025-60705), Windows Ancillary Function Driver for WinSock (CVE-2025-60719, CVE-2025-62213, CVE-2025-62217), Microsoft SQL Server (CVE-2025-59499)

🗒 Full Vulristics report

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About Remote Code Execution – Microsoft SharePoint “ToolShell” (CVE-2025-49704) vulnerability

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About Remote Code Execution - Microsoft SharePoint ToolShell (CVE-2025-49704) vulnerability

About Remote Code Execution – Microsoft SharePoint “ToolShell” (CVE-2025-49704) vulnerability. This vulnerability is from the Microsoft’s July Patch Tuesday. SharePoint is a web application developed by Microsoft for corporate intranet portals, document management, and collaborative work. Deserialization of untrusted data in the DataSetSurrogateSelector class leads to remote code execution in the context of the SharePoint web server process. Exploitation requires authentication, obtainable for example via CVE-2025-49706 (“ToolShell” chain).

🔬 The “ToolShell” chain was demonstrated by the Viettel Cyber Security team at Pwn2Own Berlin, May 15–17, 2025 (prize $100,000).

👾 Signs of exploitation in the wild have been observed since July 7. The vulnerability was added to CISA KEV on July 22.

🛠 Public exploits available on GitHub since July 21.

➡️ Later “ToolShell” vulnerabilities: CVE-2025-53770 and CVE-2025-53771.

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