CVE-2021-34523

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Summary

CVECVE-2021-34523
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-07-14 18:15:00 UTC
Updated2023-12-28 23:15:00 UTC
DescriptionMicrosoft Exchange Server Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-33768, CVE-2021-34470.

Risk And Classification

EPSS: 0.999870000 probability, percentile 0.999830000 (date 2026-07-22)

CISA KEV: Listed on 2021-11-03; due 2021-11-17; ransomware use Known

Problem Types: CWE-287

CISA Known Exploited Vulnerability

VendorMicrosoft
ProductExchange Server
NameMicrosoft Exchange Server Privilege Escalation Vulnerability
Required ActionApply updates per vendor instructions.
Noteshttps://nvd.nist.gov/vuln/detail/CVE-2021-34523

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Microsoft Exchange Server 2013 cumulative_update_23 All All
Application Microsoft Exchange Server 2016 cumulative_update_19 All All
Application Microsoft Exchange Server 2016 cumulative_update_20 All All
Application Microsoft Exchange Server 2019 cumulative_update_8 All All
Application Microsoft Exchange Server 2019 cumulative_update_9 All All

References

ReferenceSourceLinkTags
Security Update Guide - Microsoft Security Response Center MISC portal.msrc.microsoft.com
Microsoft Exchange ProxyShell Remote Code Execution ≈ Packet Storm MISC packetstormsecurity.com
ZDI-21-822 | Zero Day Initiative MISC www.zerodayinitiative.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

Legacy QID Mappings

  • 50112 Microsoft Exchange Server Multiple Vulnerabilities July 2021
  • 50114 Microsoft Exchange Server Multiple Vulnerabilities (ProxyShell) (unauthenticated)

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