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Vulnerabilities

Vulnerability · CVE-2020-17144

Microsoft Exchange Server Remote Code Execution Vulnerability

Published Dec 9, 2020 · catalog updated Jun 16, 2026 · Microsoft Exchange Server

Patch now

CVE-2020-17144 is in the CISA known-exploited catalog, due May 3, 2022. Confirm Microsoft Exchange Server against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High8.4
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
36.51%
Remediation
Remediation guidance
Affected products
cpe microsoft/exchange server · vendor Microsoft Exchange Server

Microsoft Exchange Server improperly validates cmdlet arguments which allow an attacker to perform remote code execution. Initial-access exploit intelligence.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/exchange server2010
  • vendor Microsoft Exchange Serverversion unspecified

How to fix CVE-2020-17144

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2020-17144 is in the CISA known-exploited catalog, due May 3, 2022. Confirm Microsoft Exchange Server against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with microsoft/exchange server 2010. Apply updates per vendor instructions.

What should an analyst verify?

CWE-502: Deserialization of Untrusted Data. EPSS 36.51%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 9, 2020 · Catalog

    Detected

    Microsoft Exchange Server improperly validates cmdlet arguments which allow an attacker to perform remote code execution.

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. May 3, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    Microsoft Exchange Server improperly validates cmdlet arguments which allow an attacker to perform remote code execution.

Sources

  • CISA KEVConfirmed exploitationCVE-2020-17144

    Microsoft Exchange Server improperly validates cmdlet arguments which allow an attacker to perform remote code execution.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2020-17144

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-17144

    30-day exploitation probability 36.5%

    first.org
  • NIST NVDVulnerability recordCVE-2020-17144

    Microsoft Exchange Remote Code Execution Vulnerability

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2020-17144

    Microsoft Exchange Server improperly validates cmdlet arguments which allow an attacker to perform remote code execution.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.