CVE-2026-55005
Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2026-55005 is a high vulnerability (CVSS 8.8) in Microsoft Exchange Server, published July 14, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.01%, the 63rd percentile. No source names a fixed version.
- Severity
- 8.8 HighCVSS 3.1, CVE List
- Exploit chance
- 1.01%EPSS, 63rd percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
- No fix listedNo source names one
Description
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
Affected products
What each source reports
CVE List Score used
Microsoft Exchange Server Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
- Record
CVE-2026-55005- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-122
- Updated
- 2026-11-10
EUVDEUVD-2026-44024
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
- Record
EUVD-2026-44024- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-10
GitHub AdvisoriesGHSA-6m3r-w7v9-p35g
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute...
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
- Record
GHSA-6m3r-w7v9-p35g- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
NVD
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
- Record
CVE-2026-55005- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | EUVD | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.