CVE-2021-34470
At a glance
- Severity
- HIGH 8.0
- EPSS
- EPSS 4.38 % · percentile 91 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- microsoft
- NVD status
- Modified
Description
Microsoft Exchange Server Elevation of Privilege Vulnerability
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.0 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C | microsoft |
| CVSS 3.1 | HIGH 8.0 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · secure@microsoft.com (Secondary) |
| CVSS 3.1 | HIGH 8.0 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · nvd@nist.gov (Secondary) |
| CVSS 2.0 | MEDIUM 5.2 | AV:A/AC:L/Au:S/C:P/I:P/A:P | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2021-21125
- GCVE · GCVE-0-2021-34470
CERT-FR advisories
- CERTFR-2021-AVI-522 — Multiples vulnérabilités dans les produits Microsoft · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_21:*:*:*:*:*:*cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Microsoft · Microsoft Exchange Server 2013 Cumulative Update 23 | affected 15.00.0 < 15.00.1497.023 |
| Microsoft · Microsoft Exchange Server 2016 Cumulative Update 21 | affected 15.01.0 < 15.01.2308.008 |
| Microsoft · Microsoft Exchange Server 2019 Cumulative Update 10 | affected 15.02.0 < 15.02.0922.007 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34470
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34470
- http://packetstormsecurity.com/files/163706/Microsoft-Exchange-AD-Schema-Misconfiguration-Privilege-Escalation.html
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |