Actively exploited · Published Sep 15, 2021 · Assigned by microsoft
CVE-2021-38646Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability
High 7.8 Exploited Ransomware
In plain English
A high-severity security flaw in Microsoft 365 Apps for Enterprise from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on March 28, 2022). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 8.0% (higher than 95% of all known vulnerabilities). Apply updates per vendor instructions.
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)8.0%top 5.2% of all CVEs
Exploited in the wildYesCISA KEV since Mar 28, 2022
Attack toolingNoneno public tooling known
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Apr 18, 2022.
Official description
Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1 – before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office 2013 Service Pack 1 | 15.0.0 – before 5381.1000 |
| Microsoft | Microsoft Office 2016 | 16.0.0 – before 5215.1000 |
| Microsoft | Microsoft Office 2019 | 19.0.0 – before https://aka.ms/OfficeSecurityReleases |
References
- Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability vendor-advisory, patch
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38646 x_refsource_MISC, x_transferred
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-38646 government-resource