RPC Runtime
CVE-2026-62781 — RPC Runtime Library Remote Code Execution Vulnerability
Executive Summary
Heap-based buffer overflow in RPC Runtime allows an unauthorized attacker to execute code over a network.
Overview
8.1
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Exploitation Unlikely
MS Exploit Likelihood
CVSS Vector
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
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.1
EPSS Score
0.00508
probability of exploitation in the next 30 days
0.40925 percentile - updated 2026-08-14
View on FIRST.org
Affected Products
22 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 Version 1607 for 32-bit Systems | 5120418 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1607 for x64-based Systems | 5120418 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 5120238 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for x64-based Systems | 5120238 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 21H2 for 32-bit Systems | 5120249 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 21H2 for ARM64-based Systems | 5120249 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 21H2 for x64-based Systems | 5120249 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 22H2 for 32-bit Systems | 5120249 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 22H2 for ARM64-based Systems | 5120249 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 22H2 for x64-based Systems | 5120249 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 23H2 for ARM64-based Systems | 5120240 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 23H2 for x64-based Systems | 5120240 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 24H2 for ARM64-based Systems 5120994 (Security Hotpatch Update) 5121003 (Security Update) Important Remote Code Execution 5101650 Base: 8.1 Temporal: 7.1 Vector: 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 10.0.26100.9106 10.0.26100.9168 Yes None Windows 11 Version 24H2 for x64-based Systems 5121003 (Security Update) 5120994 (Security Hotpatch Update) Important Remote Code Execution 5101650 Base: 8.1 Temporal: 7.1 Vector: 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 10.0.26100.9168 10.0.26000.9106 Yes None Windows 11 Version 25H2 for ARM64-based Systems 5121003 (Security Update) 5120994 (Security Hotpatch Update) Important Remote Code Execution 5101650 Base: 8.1 Temporal: 7.1 Vector: 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 10.0.26200.9168 10.0.26100.9106 Yes None Windows 11 Version 25H2 for x64-based Systems 5121003 (Security Update) 5120994 (Security Hotpatch Update) Important Remote Code Execution 5101650 Base: 8.1 Temporal: 7.1 Vector: 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 10.0.26200.9168 10.0.26100.9106 Yes None Windows 11 Version 26H1 for ARM64-based Systems | 5121000 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 version 26H1 for x64-based Systems | 5121000 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2012 | 5120386 (Monthly Rollup) |
Important | Remote Code Execution | Yes |
| Windows Server 2012 (Server Core installation) | 5120386 (Monthly Rollup) |
Important | Remote Code Execution | Yes |
| Windows Server 2012 R2 | 5120385 (Monthly Rollup) |
Important | Remote Code Execution | Yes |
| Windows Server 2012 R2 (Server Core installation) | 5120385 (Monthly Rollup) |
Important | Remote Code Execution | Yes |
| Windows Server 2016 | 5120418 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2016 (Server Core installation) | 5120418 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 | 5120238 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 (Server Core installation) | 5120238 (Security Update) |
Important | Remote Code Execution | Yes |
Patches
7 patches
| Article | Type | Restart |
|---|---|---|
5120418 |
Security Update | Yes |
5120238 |
Security Update | Yes |
5120249 |
Security Update | Yes |
5120240 |
Security Update | Yes |
5121000 |
Security Update | Yes |
5120386 |
Monthly Rollup | Yes |
5120385 |
Monthly Rollup | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Microsoft has not published researcher acknowledgments for this CVE, or they are not yet reflected in our data source. Check the MSRC advisory directly for the most current credit information.
References
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