Security readout for executives and security teams
Plain-English summary
CVE-2026-25173 is a high-severity Microsoft Windows RRAS flaw that could let an authorized network attacker run code on affected systems. It affects many supported Windows client and server versions. The main business concern is compromise of systems providing routing or remote access services, especially servers reachable by lower-privileged users.
Executive priority
Treat this as a priority patching item for Windows remote access infrastructure. It is high impact if exploited, but the provided sources do not show active exploitation. Focus first on internet-facing or broadly reachable RRAS systems and servers supporting VPN or routing functions.
Technical view
The issue is an integer overflow or wraparound in Windows Routing and Remote Access Service. Microsoft rates it CVSS 8.0: network attack vector, low complexity, low privileges required, user interaction required, and high confidentiality, integrity, and availability impact. MSRC lists an official update as available.
Likely exposure
Exposure is most relevant where RRAS is installed or enabled on affected Windows systems, particularly servers providing VPN, routing, or remote access functions. The source bundle lists Windows 10, Windows 11, and Windows Server versions from 2012 through 2025 as affected.
Exploitation context
The CVSS vector indicates exploitation requires network access, low privileges, and user interaction. The CVE is not listed as KEV in the provided bundle, and no provided source states active exploitation. Microsoft’s exploitability field is marked E:U, indicating unproven exploitation in the supplied data.
Researcher notes
Evidence is limited to CVE and Microsoft advisory data in the source bundle. The vulnerability class maps to CWE-190 and CWE-122. Do not assume unauthenticated exploitation: the provided CVSS vector requires low privileges and user interaction. Validate exposure by RRAS role presence, not just Windows version.
Mitigation direction
- Review Microsoft’s MSRC advisory for the applicable update guidance.
- Prioritize patching RRAS-enabled Windows servers and remote access infrastructure.
- Restrict network access to RRAS services where business requirements allow.
- Monitor Microsoft guidance for any revised mitigations or affected-version details.
Validation and detection
- Inventory Windows systems with RRAS installed or enabled.
- Map inventoried systems to Microsoft’s affected product list.
- Confirm applicable Microsoft security updates are installed.
- Review remote access servers for unusual authentication or service activity.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-122: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-190: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-25173 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C2.15.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Windows Routing and Remote Access Service (RRAS) Remote Code Execution VulnerabilityCVE reference · vendor-advisory, patch
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.