A remote code execution vulnerability exists in the way that Microsoft Outlook parses specially modified rule export files.
An attacker who successfully exploited this vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Systems such as workstations and terminal servers where Microsoft Outlook is used are at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.
In an email attack scenario, an attacker could exploit the vulnerability by sending a specially crafted email message to the user and then convincing the user to open the email and import an attached .rwz (rule export) file. Exploitation of this vulnerability requires that a user open a specially crafted email message with an affected version of Microsoft Outlook, download a malicious attachment, and manually import the contents of the attachment using the Outlook user interface.
The update addresses the vulnerability by correcting the way that Microsoft Outlook parses rule export files.
## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Microsoft Outlook 2010 Service Pack 2 (32-bit editions) | | [KB4461529](https://patchblox.com/security/data/fix/microsoft/kb4461529.md) | Nov 13, 2018 | | Microsoft | Microsoft Outlook 2010 Service Pack 2 (64-bit editions) | | [KB4461529](https://patchblox.com/security/data/fix/microsoft/kb4461529.md) | Nov 13, 2018 | | Microsoft | Microsoft Outlook 2013 RT Service Pack 1 | | [KB4461486](https://patchblox.com/security/data/fix/microsoft/kb4461486.md) | Nov 13, 2018 | | Microsoft | Microsoft Outlook 2013 Service Pack 1 (32-bit editions) | | [KB4461486](https://patchblox.com/security/data/fix/microsoft/kb4461486.md) | Nov 13, 2018 | | Microsoft | Microsoft Outlook 2013 Service Pack 1 (64-bit editions) | | [KB4461486](https://patchblox.com/security/data/fix/microsoft/kb4461486.md) | Nov 13, 2018 | | Microsoft | Microsoft Outlook 2016 (32-bit edition) | | [KB4461506](https://patchblox.com/security/data/fix/microsoft/kb4461506.md) | Nov 13, 2018 | | Microsoft | Microsoft Outlook 2016 (64-bit edition) | | [KB4461506](https://patchblox.com/security/data/fix/microsoft/kb4461506.md) | Nov 13, 2018 | --- Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.