CVE-2021-34523
Microsoft Exchange Server Privilege Escalation Vulnerability
CVSS
9.0
Crítico
EPSS
100.0%
p100
KEV
SÍ
3 nov 2021
Exploit Today
80
0-100
Publicado: 14 jul 2021 · Última mod.: 10 ago 2026
100.0%EPSS · 30 días100.0%
2026-09-162026-10-14
Producto
Microsoft / Exchange Server
Vulnerabilidad
Microsoft Exchange Server Privilege Escalation Vulnerability
Añadido a KEV
3 nov 2021
Remediar antes de
17 nov 2021
Uso conocido en ransomware
Sí
Descripción resumida
Microsoft Exchange Server contains an unspecified vulnerability that allows for privilege escalation.
Acción requerida
Apply updates per vendor instructions.
Notas
https://nvd.nist.gov/vuln/detail/CVE-2021-34523
Microsoft Exchange Server Elevation of Privilege Vulnerability
- msrc.microsoft.comhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34523
- packetstormsecurity.comhttp://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html
- portal.msrc.microsoft.comhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34523
- www.zerodayinitiative.comhttps://www.zerodayinitiative.com/advisories/ZDI-21-822/
- www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34523
CVECVSSEPSSKEVRExplotTítuloVis.
CVE-2023-215298.8 ALT99.1%
KEV—80Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability57dCVE-2022-410808.8 ALT99.6%
KEV—80Microsoft Exchange Server Privilege Escalation Vulnerability66dCVE-2021-344739.1 CRÍ100.0%
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KEV—80Microsoft Exchange Server Information Disclosure65dCVE-2021-311967.2 ALT99.0%
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KEV—80Microsoft Exchange Server Remote Code Execution Vulnerability13d