Exploited· due 2024-09-117.2highHigh
CVE-2021-31196
Microsoft Exchange Server
Microsoft Exchange Server Remote Code Execution Vulnerability
Exploitation status
- CISA has confirmed this is being exploited in the wild. That is an observation of real attacks, not a prediction.
- US federal civilian agencies are required to remediate it by 2024-09-11. That deadline does not bind private companies, but it is a reasonable benchmark for how urgently CISA views it.
- A vendor advisory or patch reference has been published.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA’s wording, unedited.
What the metrics mean
- It is reachable over a network, without needing local access.
- For an attacker who can reach it, no special conditions are needed to exploit it.
- To exploit it, an administrative account is needed.
- Beyond that, no action by a user is required.
Scoring
- CVSS
- 7.2 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H- Assigned by
- secure@microsoft.com
Dates
- Published
- 2021-07-14
- Last modified
- 2026-08-10
- Added to KEV
- 2024-08-21
- Remediation due
- 2024-09-11
- Sources
- CISA KEV, NVD
Affected products
- Microsoft Exchange Server2013, 2016, 2019
As listed in the NVD configuration data. Not a statement about your estate.