How severe is CVE-2020-17144?

High severity. CVSS v3 base score is 8.4 out of 10.

Is CVE-2020-17144 known to be exploited?

Yes. CVE-2020-17144 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 48 public proof-of-concept repositories are indexed.

Vulnerability in Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31

CVE-2020-17144

Microsoft Exchange Remote Code Execution Vulnerability

EPSS: 0.920 (99.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: 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.

Affected products

Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31 — versions 0

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-03.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

Microsoft Exchange Remote Code Execution Vulnerability (vendor-advisory)

Frequently asked questions

What is CVE-2020-17144?: CVE-2020-17144 is a high-severity vulnerability in Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31. CVSS score: 8.4/10. Published 2020-12-09.
How severe is CVE-2020-17144?: High severity. CVSS v3 base score is 8.4 out of 10.
Is CVE-2020-17144 known to be exploited?: Yes. CVE-2020-17144 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 48 public proof-of-concept repositories are indexed.