PULSEUnderground Intel

EN VIVO0señales / 24h

FEED

vulnKEV agrega CVE-2023-49105 — ownCloud / ownCloudvulnKEV agrega CVE-2026-53362 — Linux / KernelvulnKEV agrega CVE-2026-66384 — JFrog / ArtifactoryvulnKEV agrega CVE-2021-23758 — Ajax.NET Professional / Ajax.NET ProfessionalvulnKEV agrega CVE-2015-3246 — Red Hat / LibuservulnKEV agrega CVE-2015-5287 — Red Hat / Automatic Bug Reporting ToolvulnKEV agrega CVE-2022-0995 — Linux / KernelvulnKEV agrega CVE-2026-8452 — Citrix / NetScaler ADC and NetScaler GatewayvulnKEV agrega CVE-2019-1068 — Microsoft / SQL ServervulnKEV agrega CVE-2026-60004 — Gitea / GiteavulnKEV agrega CVE-2026-21962 — Oracle / HTTP Server and Oracle Weblogic Server Proxy Plug-invulnKEV agrega CVE-2026-73570 — Synacor / Zimbra Collaboration Suite (ZCS)vulnKEV agrega CVE-2026-72530 — TrueConf / ServervulnKEV agrega CVE-2026-72529 — TrueConf / ServervulnKEV agrega CVE-2023-49105 — ownCloud / ownCloudvulnKEV agrega CVE-2026-53362 — Linux / KernelvulnKEV agrega CVE-2026-66384 — JFrog / ArtifactoryvulnKEV agrega CVE-2021-23758 — Ajax.NET Professional / Ajax.NET ProfessionalvulnKEV agrega CVE-2015-3246 — Red Hat / LibuservulnKEV agrega CVE-2015-5287 — Red Hat / Automatic Bug Reporting ToolvulnKEV agrega CVE-2022-0995 — Linux / KernelvulnKEV agrega CVE-2026-8452 — Citrix / NetScaler ADC and NetScaler GatewayvulnKEV agrega CVE-2019-1068 — Microsoft / SQL ServervulnKEV agrega CVE-2026-60004 — Gitea / GiteavulnKEV agrega CVE-2026-21962 — Oracle / HTTP Server and Oracle Weblogic Server Proxy Plug-invulnKEV agrega CVE-2026-73570 — Synacor / Zimbra Collaboration Suite (ZCS)vulnKEV agrega CVE-2026-72530 — TrueConf / ServervulnKEV agrega CVE-2026-72529 — TrueConf / Server

← Todos los CVEs

CVE Watch19 ago 2026

CVE-2021-26858

Microsoft Exchange Server Remote Code Execution Vulnerability

CVSS

7.8

Alto

EPSS

93.7%

p100

KEV

SÍ

3 nov 2021

Exploit Today

80

0-100

Publicado: 3 mar 2021 · Última mod.: 19 ago 2026

EPSS · 30d

89.5%EPSS · 30 días93.7%

2026-08-022026-08-31

Ficha del catálogo KEV

Producto

Microsoft / Exchange Server

Vulnerabilidad

Microsoft Exchange Server Remote Code Execution Vulnerability

Añadido a KEV

3 nov 2021

Remediar antes de

3 may 2022

Uso conocido en ransomware

Sí

Descripción resumida

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

Acción requerida

Apply updates per vendor instructions.

Notas

Reference CISA's ED 21-02 (https://www.cisa.gov/news-events/directives/ed-21-02-mitigate-microsoft-exchange-premises-product-vulnerabilities) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 21-02. https://nvd.nist.gov/vuln/detail/CVE-2021-26858

Descripción técnica

Microsoft Exchange Server Remote Code Execution Vulnerability

Referencias oficiales

CVEs relacionados

CVECVSSEPSSKEVRExplotTítuloVis.

CVE-2023-215298.8 ALT

KEV—80Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability12d CVE-2022-410808.8 ALT

KEV—80Microsoft Exchange Server Privilege Escalation Vulnerability21d CVE-2021-345239.0 CRÍ

KEV—80Microsoft Exchange Server Privilege Escalation Vulnerability21d CVE-2021-344739.1 CRÍ

KEV—80Microsoft Exchange Server Remote Code Execution Vulnerability21d CVE-2021-337667.3 ALT

KEV—80Microsoft Exchange Server Information Disclosure21d CVE-2021-311967.2 ALT

KEV—80Microsoft Exchange Server Information Disclosure Vulnerability21d