CVE-2021-42305
At a glance
- Severity
- MEDIUM 6.5
- EPSS
- EPSS 7.87 % · percentile 95 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- microsoft
- NVD status
- Modified
Description
Microsoft Exchange Server Spoofing Vulnerability
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C | microsoft |
| CVSS 3.1 | MEDIUM 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N | NVD · secure@microsoft.com (Secondary) |
| CVSS 3.1 | MEDIUM 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N | NVD · nvd@nist.gov (Secondary) |
| CVSS 2.0 | MEDIUM 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2021-29280
- GCVE · GCVE-0-2021-42305
CERT-FR advisories
- CERTFR-2021-AVI-863 — 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:2016:cumulative_update_22:*:*:*:*:*:*cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10:*:*:*:*:*:*cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_11:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Microsoft · Microsoft Exchange Server 2013 Cumulative Update 23 | affected 15.00.0 < 15.00.1497.026 |
| Microsoft · Microsoft Exchange Server 2016 Cumulative Update 21 | affected 15.01.0 < 15.01.2308.020 |
| Microsoft · Microsoft Exchange Server 2016 Cumulative Update 22 | affected 15.0.0 < 15.01.2375.017 |
| Microsoft · Microsoft Exchange Server 2019 Cumulative Update 10 | affected 15.02.0 < 15.02.0792.019 |
| Microsoft · Microsoft Exchange Server 2019 Cumulative Update 11 | affected 15.02.0 < 15.02.0986.014 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42305
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42305
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 |