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High 8.4Known exploited (CISA KEV)Published Dec 9, 2020
CVE-2020-17144Microsoft Exchange Remote Code Execution Vulnerability
Updated under an hour ago ()
Does this affect you?
It affects Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31 and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by May 3, 2022. Treat that date as your deadline.
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Microsoft Exchange Remote Code Execution Vulnerability
- CVSS
- 8.4 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C
- Weakness (CWE)
- CWE-502
- Known exploited
- Added to CISA KEV Nov 3, 2021; federal remediation due May 3, 2022Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 36.51% (percentile 98)
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Jun 9, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31 microsoft:exchange_server_2010_service_pack_3_update_rollup_31 (from the name) | before publication | CNA record |
microsoft exchange_server microsoft:exchange_server | 2010 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17144vendor-advisory, patch
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17144patch, vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-17144us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.