Microsoft Office Outlook: Remote code execution through heap-based buffer overflow
Summary
Microsoft Office Outlook contains a heap-based buffer overflow (CWE-122). According to the CVE record, an unauthorized attacker can execute code locally. The CVSS 3.1 base score is 7.8 (High), and the vector requires user interaction, so a local user action is needed. The NVD analysis is still pending, and no exploitation has been reported.
Affected
- Microsoft 365 Apps for Enterprise: versions from 16.0.1 before the fixed build listed at https://aka.ms/OfficeSecurityReleases
- Microsoft Office LTSC 2021: versions from 16.0.1 before 16.0.14334.21048
- Microsoft Office LTSC 2024: versions from 16.0.0 before 16.0.17932.21140
Fixed in
- Microsoft Office LTSC 2021: 16.0.14334.21048 or later
- Microsoft Office LTSC 2024: 16.0.17932.21140 or later
- Microsoft 365 Apps for Enterprise: Unknown. See https://aka.ms/OfficeSecurityReleases
Workaround
- Unknown. No vendor workaround has been identified. Apply the security update.
Exploitation
- No evidence of exploitation in the wild in the available sources. CISA KEV: not listed according to Strix.
- No public proof of concept found.
- CISA SSVC: exploitation none, automatable no, technical impact total.
Our recommendation
- Install the November 2026 Microsoft security updates on all systems with Office or Outlook, starting with the LTSC and Microsoft 365 installations.
- Check the fixed build in the MSRC advisory and inventory the Office versions in use.
- Monitor NVD and CISA KEV for changes, since the NVD analysis is pending.
- Keep users aware of suspicious emails, attachments and links, because email is a common entry point.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE Record CVE-2026-119997 www.cve.org
- Microsoft Security Update Guide CVE-2026-119997 msrc.microsoft.com
- Strix CVE-2026-119997 www.strix.ai
- Threatint CVE-2026-119997 cve.threatint.com
- Automox Patch Tuesday November 2026 www.automox.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 03:34.
Original description (NVD)
Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code locally.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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