8.4

CVE-2020-17144: Microsoft Exchange Server Remote Code Execution Vulnerability

CVSS: 8.4v3.1HighKEVAnalyzed
Published 09-12-2020Last modified 09-06-2026
Open JSON

Vulnerability summary

CVE-2020-17144 is a high (CVSS 8.4) Deserialization of Untrusted Data vulnerability in Microsoft Exchange Server. It is known to be exploited: CISA lists it, first on 03-11-2021. EPSS estimates a 36.51% chance of exploitation in the next 30 days, higher than 98.4% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
8.4/10
010
High · v3.1 (CVE.org)
EPSS score
36.51%
0%100%
High · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 09-12-2020
    PublishedVulnerability first disclosed.
  2. 03-11-2021
    Added to CISA KEVMicrosoft Exchange Server Remote Code Execution Vulnerability
  3. 03-05-2022
    CISA remediation dueApply updates per vendor instructions.
  4. 09-06-2026
    Last modifiedVulnerability information updated.

Description

Microsoft Exchange Remote Code Execution Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

36.51%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

0.00 pp

From 36.51% on 20-09-2026

20-09-202620-10-2026
EPSS score
36.51%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
03-11-2021
Federal due date
03-05-2022

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2020-17144

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft2 products

1 vendor · 2 products

References

3 links