CVE-2021-28480

9.8

CVSScritical

Exploitable remotely over the internet · no authentication required.

Attack Vector

Network

Privileges Req.

None

User Interaction

None

microsoft exchange server 2013 cumulative update 23microsoft exchange server 2016 cumulative update 19microsoft exchange server 2019 cumulative update 8microsoft exchange server 2016 cumulative update 20microsoft exchange server 2019 cumulative update 9

Updated Nov 10, 2026View on NVD →

S4E scanner

criticalProduct Based Network Vulnerabilities~10 seconds

Microsoft Exchange - Pre-Auth SSRF / ACL Bypass (ProxyNotFound)

Microsoft Exchange Server contains a remote code execution caused by improper input validation in the server component, letting remote attackers execute arbitrary code, exploit requires network access to the server. References: https://sec.vnpt.vn/2021/04/microsoft-exchange-from-deserialization-to-post-auth-rce-cve-2021-28482 https://hitcon.org/2021/agenda/279d7810-e619-4dc3-9113-b11bad5277ec/The%20Proxy%20Era%20of%20Microsoft%20Exchange%20Server.pdf https://www.youtube.com/watch?v=vn4niT9XEIM https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2021-28480 https://nvd.nist.gov/vuln/detail/cve-2021-28480 Remediation: Apply the latest security patches and updates provided by Microsoft for Exchange Server

10 assets checked · domain, subdomain, ipv4

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CVE history: microsoft exchange server 2013 cumulative update 23

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