CVE-2026-85880
KEV: known exploited SSVC: activeWindows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Attack conditions and impact
Derived from the CNA (via NVD) CVSS 3.1 vector| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | L | Local |
| Attack complexity AC | L | Low (easy) |
| Privileges required PR | L | Regular user |
| User interaction UI | N | None |
| Scope S | U | Unchanged |
| Confidentiality C | H | High |
| Integrity I | H | High |
| Availability A | H | High |
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Description
Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
CISA KEV entry
Microsoft Windows Heap-Based Buffer Overflow Vulnerability — Microsoft / Windows
Microsoft Windows Advanced Local Procedure Call contains a heap-based buffer overflow vulnerability that allows an attacker to elevate privileges locally.
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-85880 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-85880
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / [email protected] (Secondary) | 3.1 | 7.8 HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| CNA / microsoft | 3.1 | 7.8 HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1607 | affected: 10.0.14393.0 … < 10.0.14393.9512 |
| Microsoft | Windows 10 Version 1809 | affected: 10.0.17763.0 … < 10.0.17763.9245 |
| Microsoft | Windows 10 Version 21H2 | affected: 10.0.19044.0 … < 10.0.19044.7725 |
| Microsoft | Windows 10 Version 22H2 | affected: 10.0.19045.0 … < 10.0.19045.7725 |
| Microsoft | Windows Server 2012 | affected: 6.2.9200.0 … < 6.2.9200.26349 |
| Microsoft | Windows Server 2012 (Server Core installation) | affected: 6.2.9200.0 … < 6.2.9200.26349 |
| Microsoft | Windows Server 2012 R2 | affected: 6.3.9600.0 … < 6.3.9600.23398 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | affected: 6.3.9600.0 … < 6.3.9600.23398 |
| Microsoft | Windows Server 2016 | affected: 10.0.14393.0 … < 10.0.14393.9512 |
| Microsoft | Windows Server 2016 (Server Core installation) | affected: 10.0.14393.0 … < 10.0.14393.9512 |
| Microsoft | Windows Server 2019 | affected: 10.0.17763.0 … < 10.0.17763.9245 |
| Microsoft | Windows Server 2019 (Server Core installation) | affected: 10.0.17763.0 … < 10.0.17763.9245 |
| Microsoft | Windows Server 2022 | affected: 10.0.20348.0 … < 10.0.20348.5622 |
NVD CPE (15)
Show CPE list
| Vendor | Product | Range | CPE |
|---|---|---|---|
| microsoft | windows_10_1607 | < 10.0.14393.9512 | cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:* |
| microsoft | windows_10_1607 | < 10.0.14393.9512 | cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:* |
| microsoft | windows_10_1809 | < 10.0.17763.9245 | cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* |
| microsoft | windows_10_1809 | < 10.0.17763.9245 | cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:* |
| microsoft | windows_10_21h2 | < 10.0.19044.7725 | cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:* |
| microsoft | windows_10_21h2 | < 10.0.19044.7725 | cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:* |
| microsoft | windows_10_21h2 | < 10.0.19044.7725 | cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:* |
| microsoft | windows_10_22h2 | < 10.0.19045.7725 | cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:* |
| microsoft | windows_10_22h2 | < 10.0.19045.7725 | cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:* |
| microsoft | windows_10_22h2 | < 10.0.19045.7725 | cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:* |
| microsoft | windows_server_2012 | cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* | |
| microsoft | windows_server_2012 | cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* | |
| microsoft | windows_server_2016 | < 10.0.14393.9512 | cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* |
| microsoft | windows_server_2019 | < 10.0.17763.9245 | cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* |
| microsoft | windows_server_2022 | < 10.0.20348.5622 | cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* |
Linux distribution status
References (2)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85880 NVD, CNA PatchVendor Advisoryvendor-advisorypatch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-85880 NVD, ADP CISA-ADP US Government Resourcegovernment-resource