CVE-2020-16949 json
Microsoft Outlook Denial of Service Vulnerability
published 2020-10-16 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-8907
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.0%
- EPSS 3.0% chance of exploitation in 30 days, percentile 87%
- public exploits
- 0
- none known
Summary
<p>A denial of service vulnerability exists in Microsoft Outlook software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could cause a remote denial of service against a system.</p> <p>Exploitation of the vulnerability requires that a specially crafted email be sent to a vulnerable Outlook server.</p> <p>The security update addresses the vulnerability by correcting how Microsoft Outlook handles objects in memory.</p>
Patch / fix
Exploit prediction
2.97% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C |
| CNA | 3.1 | 4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Affected products
- Microsoft Microsoft Office 2019
- Microsoft Microsoft 365 Apps for Enterprise
- Microsoft Microsoft Outlook 2016
- Microsoft Microsoft Outlook 2013 Service Pack 1
- Microsoft Microsoft Outlook 2010 Service Pack 2
Classification
- Weakness
-
- CWE-401 Missing Release of Memory after Effective Lifetime
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2020-16949
patch, vendor-advisory
Sources
- CVE List CVE-2020-16949
- NVD CVE-2020-16949
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