Cyber Resilience

CVE-2022-26809

Microsoft Windows 10 1607 … 21h2

High EPSS
Published
15 April 2022
Modified
21 November 2024
CVSS Score v3.1 9.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.91 99.8th percentile
Risk Priority 97 floored blend · peak EPSS

Summary

CVE-2022-26809 is a critical-severity an unspecified weakness vulnerability in Microsoft Windows 10. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 0.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SC-7 (Boundary Protection) and SI-2 (Flaw Remediation) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2022-26809 is a remote code execution vulnerability affecting the Remote Procedure Call Runtime component. It carries a CVSS 3.1 base score of 9.8 and was published on 15 April 2022.

An unauthenticated attacker can exploit the flaw over the network without user interaction to obtain full control over confidentiality, integrity, and availability on the target system.

Microsoft’s security advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-26809 supplies patch information and mitigation guidance for affected Windows installations.

The CVE’s EPSS score has remained near its peak value of 0.9260, indicating sustained exploitation interest after disclosure.

EU & UK References

Vulnerability Data

Remote Procedure Call Runtime Remote Code Execution Vulnerability

CWE(s)
NVD-CWE-noinfo

Related Threats

Likely ATT&CK TechniquesAI

Techniques this vulnerability likely enables, inferred from its description, weakness type, and attributed-actor tradecraft. Confidence is per-technique.

T1190 Exploit Public-Facing Application Initial Accessconfidence: HIGH
Unauthenticated remote code execution over the network against a public-facing RPC service directly matches exploitation of a public-facing application.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movementconfidence: HIGH
The flaw resides in the RPC runtime, enabling remote exploitation of a Windows service to execute arbitrary code.
attack.mitre.org →
inferred from description · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

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CVE-2023-21746Same product: Microsoft Windows 10
CVE-2023-21757Same product: Microsoft Windows 10
CVE-2023-21776Same product: Microsoft Windows 10
CVE-2022-41076Same product: Microsoft Windows 10
CVE-2022-21972Same product: Microsoft Windows 10
CVE-2022-37958Same product: Microsoft Windows 10
CVE-2023-21767Same product: Microsoft Windows 10

Affected Assets

microsoft
windows 10
1607, 1809, 1909, 20h2, 21h1
microsoft
windows 11
all versions
microsoft
windows 7
all versions
microsoft
windows 8.1
all versions
microsoft
windows rt 8.1
all versions
microsoft
windows server 2008
all versions, r2
microsoft
windows server 2012
all versions, r2
microsoft
windows server 2016
20h2, all versions
microsoft
windows server 2019
all versions
microsoft
windows server 2022
all versions

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • SI-2 Flaw Remediation
  • SC-7 Boundary Protection
  • AC-3 Access Enforcement
Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Directly requires applying the vendor patch that eliminates the unauthenticated RPC RCE flaw.

SC-7 Boundary Protection good match
prevent

Boundary-protection rules can block or restrict inbound RPC traffic on ports 135/139/445 before exploitation occurs.

AC-3 Access Enforcement partial match
prevent

Enforces access-control policy on RPC interfaces so unauthenticated callers cannot reach the vulnerable runtime code path.

References