Is CVE-2021-28481 actively exploited?

Yes. CVE-2021-28481 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-28481 be exploited remotely?

The attack vector of CVE-2021-28481 has not been classified yet.

What is the CVSS score of CVE-2021-28481?

CVE-2021-28481 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-28481

UNKNOWNCISA KEVIN THE WILD

CVE-2021-28481

Published: April 11, 2026

EPSS:38.01%probability of exploitation in 30 daysPercentile:97.2th

Official Description

Microsoft Exchange Server Remote Code Execution Vulnerability

NVD Source

Risk Analysis

This is a remote code execution vulnerability in Microsoft Exchange Server. Remote code execution allows an attacker to run arbitrary code on the affected server, leading to full system compromise. The confirmed exploitation in the wild makes this an extremely critical vulnerability.

This vulnerability is actively exploited in the wild and is included in CISA's KEV catalog. It is remotely exploitable.

Recommended Action

Apply the latest security updates from Microsoft for Exchange Server immediately. Ensure Exchange servers are properly secured and exposed only when necessary.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-28481 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-28481 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.