Tag Archives: OLE

About Remote Code Execution – Microsoft Word (CVE-2026-21514) vulnerability

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About Remote Code Execution - Microsoft Word (CVE-2026-21514) vulnerability

About Remote Code Execution – Microsoft Word (CVE-2026-21514) vulnerability. This vulnerability is from February Microsoft Patch Tuesday. Reliance on Untrusted Inputs in a Security Decision (CWE-807) in Microsoft Office Word allows an unauthenticated attacker to bypass OLE security features when opening a malicious file. The vulnerability is NOT exploitable via the Preview Pane.

👾 Microsoft reports that the vulnerability is being exploited in the wild. It has been listed in CISA KEV since February 10.

💬 Microsoft has classified the vulnerability as a Security Feature Bypass, but given that exploiting such vulnerabilities can lead to arbitrary code execution, it seems reasonable to classify it as Remote Code Execution, similar to the actively exploited CVE-2026-21509.

🛠 No public exploits are available yet.

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February “In the Trend of VM” (#24): vulnerabilities in Microsoft products

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February In the Trend of VM (#24): vulnerabilities in Microsoft products

February “In the Trend of VM” (#24): vulnerabilities in Microsoft products. A traditional monthly roundup of trending vulnerabilities. This time, compact and all-Microsoft.

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

In total, two vulnerabilities:

🔻 RCE – Microsoft Office (CVE-2026-21509)
🔻 InfDisc – Desktop Window Manager (CVE-2026-20805)

🟥 Trending Vulnerabilities Portal

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About Remote Code Execution – Microsoft Office (CVE-2026-21509) vulnerability

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About Remote Code Execution - Microsoft Office (CVE-2026-21509) vulnerability

About Remote Code Execution – Microsoft Office (CVE-2026-21509) vulnerability. The vulnerability was urgently fixed on January 26, outside the regular Microsoft Patch Tuesday. Microsoft classified it as a Security Feature Bypass, but in fact, it is more of a Remote Code Execution. The vulnerability involves bypassing OLE (Object Linking and Embedding) security features in Microsoft 365 and Microsoft Office. It is exploited when opening malicious Office files (Preview Pane is safe).

⚙️ In Office 2021+, protection is enabled automatically via server-side changes after restarting the applications. For Office 2016/2019, updates must be installed or registry changes applied.

👾 Microsoft reports that the vulnerability is being exploited in the wild.

🛠 No public exploits are available yet.

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New episode “In the Trend of VM” (#12): 8 February CVEs & Why the Darknet Matters for VM Specialists

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New episode “In the Trend of VM” (#12): 8 February CVEs & Why the Darknet Matters for VM Specialists. Now with a new design and new video editing. 😉

📹 Video on YouTube and LinkedIn
🗞 Post on Habr (rus)
🗒 Digest on the PT website

Content:

🔻 00:00 Greetings
🔻 00:23 Remote Code Execution – Windows Lightweight Directory Access Protocol (LDAP) (CVE-2024-49112)
🔻 01:35 Remote Code Execution – Microsoft Configuration Manager (CVE-2024-43468)
🔻 02:38 Remote Code Execution – Windows OLE (CVE-2025-21298)
🔻 03:55 Elevation of Privilege – Windows Hyper-V NT Kernel Integration VSP (CVE-2025-21333, CVE-2025-21334, CVE-2025-21335)
🔻 05:02 Authentication Bypass – FortiOS/FortiProxy (CVE-2024-55591)
🔻 06:16 Remote Code Execution – 7-Zip (CVE-2025-0411)
🔻 07:27 Should a VM specialist be aware of what is happening in the Darknet?
🔻 08:48 About the digest of trending vulnerabilities

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About Remote Code Execution – Windows OLE (CVE-2025-21298) vulnerability

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About Remote Code Execution - Windows OLE (CVE-2025-21298) vulnerability

About Remote Code Execution – Windows OLE (CVE-2025-21298) vulnerability. The vulnerability is from the January Microsoft Patch Tuesday. OLE (Object Linking and Embedding) is a technology for linking and embedding objects into other documents and objects, developed by Microsoft. A common use of this technology is embedding an Excel table in a Word document.

What is this vulnerability about? The attacker’s code executes when a specially crafted RTF document is opened or when a malicious email is opened or previewed in Microsoft Outlook. In the second case, no action is required from the victim other than clicking on the message. 🤷‍♂️ Microsoft recommends viewing messages in Outlook only in plain text.

On January 20, an exploit PoC appeared on GitHub that demonstrates Memory Corruption when opening an RTF document. Now we are waiting for an RCE exploit for Outlook. 😉

There have been no reports of attacks yet.

Fix this vulnerability ASAP!

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First impressions of the April Microsoft Patch Tuesday

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First impressions of the April Microsoft Patch Tuesday
First impressions of the April Microsoft Patch TuesdayFirst impressions of the April Microsoft Patch TuesdayFirst impressions of the April Microsoft Patch TuesdayFirst impressions of the April Microsoft Patch TuesdayFirst impressions of the April Microsoft Patch TuesdayFirst impressions of the April Microsoft Patch TuesdayFirst impressions of the April Microsoft Patch TuesdayFirst impressions of the April Microsoft Patch TuesdayFirst impressions of the April Microsoft Patch Tuesday

First impressions of the April Microsoft Patch Tuesday. I don’t even know what to write. 🤪 Very strange! 173 vulnerabilities, of which 23 were added since the last Patch Tuesday.

Microsoft flags one vulnerability as being exploited in the wild: Spoofing – Proxy Driver (CVE-2024-26234). And only Qualys briefly mentions it. Literally like this: “Microsoft has not disclosed any information about the vulnerability”. 😅 ZDI also claims that Security Feature Bypass – SmartScreen Prompt (CVE-2024-29988) is being exploited in the wild, which is a Mark of the Web (MotW) bypass.

There are no exploits for anything yet. The following vulnerabilities can be highlighted:

🔸 Remote Code Execution – Microsoft Excel (CVE-2024-26257). Can be exploited by an attacker when the victim opens a specially crafted file.
🔸 Remote Code Execution – RPC (CVE-2024-20678). It is highlighted by ZDI, which also claims 1.3 million exposed TCP 135 ports.
🔸 Spoofing – Outlook for Windows (CVE-2024-20670). ZDI writes that this is an Information Disclosure vulnerability that can be used in NTLM relay attacks.
🔸 Remote Code Execution – Windows DNS Server (CVE-2024-26221, CVE-2024-26222, CVE-2024-26223, CVE-2024-26224, CVE-2024-26227, CVE-2024-26231, CVE-2024-26233). Maybe some of this will be exploited in the wild, ZDI particularly highlights CVE-2024-26221.
🔸 Remote Code Execution – Microsoft Defender for IoT (CVE-2024-21322, CVE-2024-21323, CVE-2024-29053). It is an IoT and ICS/OT security solution that can be deployed on-prem.

There are simply indecently massive fixes:

🔹 Remote Code Execution – Microsoft OLE DB Driver for SQL Server / Microsoft WDAC OLE DB Provider for SQL Server / Microsoft WDAC SQL Server ODBC Driver. 28 CVEs! I won’t even list everything here. 😨
🔹 Security Feature Bypass – Secure Boot. 23 CVEs!

🗒 Vulristics report

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Upd. 10.04 I slightly tweaked the vulnerability type detection to increase the priority of the detection based on the Microsoft generated description compared to the detection based on CWE. In particular, the type of vulnerability for Spoofing – Proxy Driver (CVE-2024-26234) and Spoofing – Outlook for Windows (CVE-2024-20670) has changed.

Microsoft Patch Tuesday May 2023: Microsoft Edge, BlackLotus Secure Boot SFB, OLE RCE, Win32k EoP, NFS RCE, PGM RCE, LDAP RCE, SharePoint RCE

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Microsoft Patch Tuesday May 2023: Microsoft Edge, BlackLotus Secure Boot SFB, OLE RCE, Win32k EoP, NFS RCE, PGM RCE, LDAP RCE, SharePoint RCE. Hello everyone! This episode will be about Microsoft Patch Tuesday for May 2023, including vulnerabilities that were added between April and May Patch Tuesdays.

Alternative video link (for Russia): https://vk.com/video-149273431_456239126

As usual, I use my open source Vulristics project to analyse and prioritize vulnerabilities. I took the comments about the vulnerabilities from the Qualys, Tenable, Rapid7, ZDI Patch Tuesday reviews.

It’s been a long time since we’ve had such tiny Patch Tuesday. 57 CVEs, including CVEs appeared during the month. And only 38 without them! 😄

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