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9.1Crítica KEV Usada en ransomware

CVE-2021-34473Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Microsoft Exchange Server 2013 Cumulative Update 23; Microsoft Microsoft Exchange Server 2016 Cumulative Update 19; Microsoft Microsoft Exchange Serv… Publicada: (hace 5 años)

Explotación conocida — Microsoft Exchange Server Remote Code Execution Vulnerability

CISA confirmó el 03.11.2021 que esta vulnerabilidad se usa en ataques reales. Plazo para las agencias federales de EE. UU.: 17.11.2021.

Acción requerida: Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-34473

Descripción

Microsoft Exchange Server Remote Code Execution Vulnerability

Debilidad (CWE): CWE-918

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

FabricanteProductoVersiones
microsoft exchange server 15.00.0 – < 15.00.1497.015
Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 15.00.0 – < 15.00.1497.015
Microsoft Microsoft Exchange Server 2016 Cumulative Update 19 15.01.0 – < 15.01.2176.012
Microsoft Microsoft Exchange Server 2016 Cumulative Update 20 15.01.0 – < 15.01.2242.008
Microsoft Microsoft Exchange Server 2019 Cumulative Update 8 15.02.0 – < 15.02.0792.013
Microsoft Microsoft Exchange Server 2019 Cumulative Update 9 15.02.0 – < 15.02.0858.010

Referencias y parches

Coincidencias CPE (NVD) (5)
  • cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:*

CVE recientes del mismo producto — Microsoft Exchange Server

9.3Crítica
CVE-2026-70279

Microsoft Exchange Server Spoofing Vulnerability

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23; Microsoft Microsoft Exchange Server 2019 Cumulative Update 14; Microsoft Microsoft Exchange Server 2019 Cumulative Update 15; Microsoft Microsoft Exchange Server Subscription Edition RTM

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

1.3%EPSS
8.1Alta
CVE-2026-70571

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23; Microsoft Microsoft Exchange Server 2019 Cumulative Update 14; Microsoft Microsoft Exchange Server 2019 Cumulative Update 15; Microsoft Microsoft Exchange Server Subscription Edition RTM

Stack-based buffer overflow in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.

1.4%EPSS
8.8Alta
CVE-2026-77910

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23; Microsoft Microsoft Exchange Server 2019 Cumulative Update 14; Microsoft Microsoft Exchange Server 2019 Cumulative Update 15; Microsoft Microsoft Exchange Server Subscription Edition RTM

Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

7.8Alta
CVE-2026-87692

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23; Microsoft Microsoft Exchange Server 2019 Cumulative Update 14; Microsoft Microsoft Exchange Server Subscription Edition RTM

Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

2.3%EPSS
7.8Alta
CVE-2026-87695

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23; Microsoft Microsoft Exchange Server 2019 Cumulative Update 14; Microsoft Microsoft Exchange Server 2019 Cumulative Update 15; Microsoft Microsoft Exchange Server Subscription Edition RTM

Inclusion of functionality from untrusted control sphere in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

7.5Alta
CVE-2026-87696

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23; Microsoft Microsoft Exchange Server 2019 Cumulative Update 14; Microsoft Microsoft Exchange Server 2019 Cumulative Update 15; Microsoft Microsoft Exchange Server Subscription Edition RTM

Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.