CVE-2021-31209
MEDIUMCVSS 6.5/10EPSS 2.63%
Last modified
CVE-2021-31209 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Microsoft Exchange Server Spoofing Vulnerability. EPSS estimates a 2.63% chance of exploitation in the next 30 days.
Description
Microsoft Exchange Server Spoofing Vulnerability
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Microsoft | Exchange Server | 2013 | Cumulative Update 23 |
| Microsoft | Exchange Server | 2016 | Cumulative Update 19 |
| Microsoft | Exchange Server | 2019 | Cumulative Update 8 |
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31209Patch, Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-615/Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31209Patch, Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-615/Third Party Advisory, VDB Entry
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-31209?
Microsoft Exchange Server Spoofing Vulnerability
How severe is CVE-2021-31209?
CVE-2021-31209 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.63% probability of exploitation in the next 30 days.
How do I fix CVE-2021-31209?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- Same Subject, Wrong User: A Cross-Issuer Account Takeover in n8nStrix found an identity-binding bug in n8n's token-exchange flow enabling account takeover.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-31209?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST