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CVE

CVE-2021-28482

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability.

HIGH · CVSS 8.8 EPSS 0.81871
Act now
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 1% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
▤

Affected Products & Versions

1
microsoft exchange serverall versions
⚠

Public Exploits & PoCs

2
nucleiMicrosoft Exchange - Pre-Auth SSRF / ACL Bypass (ProxyNotFound)critical
nucleiMicrosoft Exchange - Pre-Auth SSRF / ACL Bypass (ProxyNotFound)critical
◈

Detection Rules (IDS/IPS)

1
et-openET EXPLOIT Microsoft Exchange RCE Setup Inbound (CVE-2021-28482)attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

8.8
HIGH · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD13 Apr 2021 · 08:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

1
msrcCVE-2021-28482Remote Code Execution
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28482PatchVendor Advisory
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