CVE-2026-25173
Published: 10 March 2026
Summary
CVE-2026-25173 is a high-severity Heap-based Buffer Overflow (CWE-122) vulnerability in Microsoft Windows 10 21H2. Its CVSS base score is 8.0 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 15.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-25173 is an integer overflow or wraparound vulnerability (CWE-190, CWE-122) in the Windows Routing and Remote Access Service (RRAS). Published on 2026-03-10, it carries a CVSS v3.1 base score of 8.0 (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H), indicating high severity due to its potential for significant impact.
An authorized attacker with low privileges (PR:L) can exploit this vulnerability over the network (AV:N) with low attack complexity (AC:L), though it requires user interaction (UI:R). Successful exploitation enables arbitrary code execution, resulting in high impacts to confidentiality, integrity, and availability (C:H/I:H/A:H) within the unchanged scope (S:U).
The Microsoft Security Response Center provides an update guide with mitigation details at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-25173.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-10641
Vulnerability details
Integer overflow or wraparound in Windows Routing and Remote Access Service (RRAS) allows an authorized attacker to execute code over a network.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Integer overflow in RRAS service enables remote authenticated RCE from low-privileged network access, directly mapping to exploitation of remote services for initial/unauthorized access and subsequent privilege escalation to achieve full system impact.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires identification and timely remediation of the integer overflow flaw in RRAS via patching as provided by Microsoft.
Enforces validation of network inputs to RRAS to prevent integer overflows from malformed data causing wraparound and code execution.
Implements memory protections like ASLR and DEP that hinder successful exploitation of the integer overflow for arbitrary code execution.