High 8.4Known exploited (CISA KEV)Published Dec 9, 2020

CVE-2020-17144Microsoft Exchange Remote Code Execution Vulnerability

Updated under an hour ago (Oct 27, 2026, 2:10 PM ET)

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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Every CVE for Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31

Exploited in the last 30 days

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

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

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17144	vendor-advisory, patch
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17144	patch, vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-17144	us-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.