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High 7.5Published Dec 9, 2025
CVE-2025-64666Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Updated under an hour ago ()
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It affects microsoft exchange_server and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-20
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
microsoft exchange_server microsoft:exchange_server | 2016; 2016; 2016; 2016; 2016; 2016; 2016; 2016; and 29 more ranges | NVD |
microsoft exchange_server_subscription_edition microsoft:exchange_server_subscription_edition | before 15.02.2562.035 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64666vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.