CVE-2021-26855
Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply updates per vendor instructions.
CISA notes
Reference CISA's ED 21-02 (https://www.cisa.gov/news-events/directives/ed-21-02-mitigate-microsoft-exchange-premises-product-vulnerabilities) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 21-02. https://nvd.nist.gov/vuln/detail/CVE-2021-26855
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:F/RL:O/RC:CAffected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 21 | 15.00.0 to <15.00.1395.012 |
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 22 | 15.00.0 to <15.00.1473.006 |
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 23 | 15.00.0 to <15.00.1497.012 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 10 | 15.01.0 to <15.01.1531.012 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 11 | 15.01.0 to <15.01.1591.018 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 12 | 15.01.0 to <15.01.1713.010 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 13 | 15.01.0 to <15.01.1779.008 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 14 | 15.01.0 to <15.01.1847.012 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 15 | 15.01.0 to <15.01.1913.012 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 16 | 15.01.0 to <15.01.1979.008 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 17 | 15.01.0 to <15.01.2044.013 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 18 | 15.01.0 to <15.01.2106.013 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 19 | 15.01.0 to <15.01.2176.009 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 8 | 15.01.0 to <15.01.1415.010 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 9 | 15.01.0 to <15.01.1466.016 |
| Microsoft | Microsoft Exchange Server 2019 | 15.02.0 to <15.02.0221.018 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 1 | 15.02.0 to <15.01.1979.006 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 2 | 15.02.0 to <15.02.0397.011 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 3 | 15.02.0 to <15.02.0464.015 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 4 | 15.02.0 to <15.02.0659.012 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 5 | 15.02.0 to <15.02.0595.008 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 6 | 15.02.0 to <15.02.0529.013 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 7 | 15.02.0 to <15.02.0721.013 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 8 | 15.02.0 to <15.02.0792.010 |
References
6 Links- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26855
- http://packetstormsecurity.com/files/161846/Microsoft-Exchange-2019-SSRF-Arbitrary-File-Write.html
- http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html
- http://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html
Record Details
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