CVE-2021-33766
CVE-2021-33766 is a high-severity vulnerability in Microsoft Exchange Server with a CVSS 3.x base score of 7.3. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-01-18).
Key facts
- Severity: High (CVSS 3.x base score 7.3)
- CVSS v2: 5.0
- EPSS exploit prediction: 98% (100th percentile)
- Actively exploited: Yes — listed in CISA KEV (added 2022-01-18)
- EU (EUVD) id: EUVD-2021-20443
- EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-01-18)
- Affected product: Microsoft Exchange Server
- Published:
- Last modified:
Description
Microsoft Exchange Server Information Disclosure Vulnerability
Frequently asked questions
- What is CVE-2021-33766?
- Microsoft Exchange Server Information Disclosure Vulnerability
- How severe is CVE-2021-33766?
- CVE-2021-33766 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
- Is CVE-2021-33766 being actively exploited?
- Yes. CVE-2021-33766 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-01-18, which means active exploitation has been confirmed. It should be prioritised for remediation.
- What products are affected by CVE-2021-33766?
- CVE-2021-33766 primarily affects Microsoft Exchange Server. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-33766?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
- Does CVE-2021-33766 have an EU (EUVD) identifier?
- Yes. CVE-2021-33766 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-20443. It is also flagged as exploited in the EUVD (since 2022-01-18).
- When was CVE-2021-33766 published?
- CVE-2021-33766 was published on 2021-07-14 and last updated on 2026-06-17.
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766
- https://www.zerodayinitiative.com/advisories/ZDI-21-798/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33766
Affected products (5)
- cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:*
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