CVE-2026-70571
Microsoft Exchange Server Remote Code Execution Vulnerability
Stack-based buffer overflow in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Exchange Server Remote Code Execution Vulnerability
Stack-based buffer overflow in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-70571- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-121
- Updated
- 2026-11-02
EUVDEUVD-2026-100139
Stack-based buffer overflow in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.
- Record
EUVD-2026-100139- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-6m32-fvj6-jjf4
Stack-based buffer overflow in Microsoft Exchange Server allows an unauthorized attacker to...
Stack-based buffer overflow in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.
- Record
GHSA-6m32-fvj6-jjf4- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-121
- Updated
- 2026-11-02
NVD
Stack-based buffer overflow in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-70571- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-121
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-70571 is a high vulnerability (CVSS 8.1) in Microsoft Exchange Server 2016 Cumulative Update 23, published October 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.39%, the 72nd percentile. No source names a fixed version.