Microsoft Microsoft Exchange Server 2019 Cumulative Update 4

Name: Microsoft Microsoft Exchange Server 2019 Cumulative Update 4
Brand: Microsoft

productEU

A product tracked in the threat graph; the vulnerabilities below are known to affect it.

critical

by severity

0critical3high4medium0low

updated 2026-10-27

vulnerabilities (7)

Related CVEs.

sort

ID	severity	EPSS	exploitable	patched	published	affected
CVE-2021-26855US	high7.5OT critical	100.0% (100th)	KEV	publication	2021-03-03	15.02.0 → publication
CVE-2020-0688US	high8.8OT critical	100.0% (100th)	KEV	no fix	2020-02-11	≤ unspecified
CVE-2021-27065US	medium6.8OT critical	99.9% (100th)	KEV	publication	2021-03-03	15.02.0 → publication
CVE-2021-26857US	medium6.8OT critical	95.8% (100th)	KEV	publication	2021-03-03	15.02.0 → publication
CVE-2021-26858US	medium6.8OT critical	93.7% (100th)	KEV	publication	2021-03-03	15.02.0 → publication
CVE-2020-0692US	high8.1	3.26% (88th)	—	no fix	2020-02-11	≤ unspecified
CVE-2020-0903US	medium5.4	1.65% (76th)	—	no fix	2020-03-12	≤ unspecified

The flaw types (CWEs) most of these CVEs share.

CWE-20Improper Input Validation2 CVEs
CWE-502Deserialization of Untrusted Data2 CVEs
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')1 CVEs
CWE-269Improper Privilege Management1 CVEs
CWE-287Improper Authentication1 CVEs
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')1 CVEs
CWE-918Server-Side Request Forgery (SSRF)1 CVEs

Which sources assert this record, and when.

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