UNKNOWNCISA KEVIN THE WILD
CVE-2021-31206
Published: April 11, 2026
EPSS:6.61%probability of exploitation in 30 daysPercentile:91.2th
Official Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Technical Analysis
CVE-2021-31206 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-2021-31206 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.
Affected Vendors & Products
Mentioned vendors (from description):
Microsoft
CPE data not yet available in NVD for this CVE.
Exploit & PoC Resources
ACTIVE EXPLOITATIONConfirmed exploitation in the wild
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Quick Facts
CVE IDCVE-2021-31206
Severity—
CISA KEVYES — Active Exploitation
ExploitIN THE WILD
EPSS (30d)6.61%
PublishedApr 11, 2026
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-31206 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.