Cyber Resilience

CVE-2023-21527

Memory Safety in Microsoft Windows 10 1809

Memory Safety
Published
10 January 2023
Modified
21 November 2024
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.020 79th percentile
Risk Priority 72 floored blend · peak EPSS

Summary

CVE-2023-21527 is a high-severity Wrap or Wraparound (CWE-191) vulnerability in Microsoft Windows 10 1809. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked in the top 21% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

Deeper analysis AI-assisted summary

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

Windows iSCSI Service contains a denial-of-service vulnerability tracked as CVE-2023-21527. The flaw is present in the Windows iSCSI service and carries a CVSS 3.1 base score of 7.5, reflecting network attack vector, low attack complexity, and no required privileges or user interaction, with high impact on availability and no impact on confidentiality or integrity. The associated weakness identifiers are CWE-191 and NVD-CWE-noinfo.

An unauthenticated remote attacker can send specially crafted network traffic to an affected system and trigger the denial-of-service condition, rendering the iSCSI service unavailable. Because the attack requires no authentication or user interaction, it can be launched from anywhere on the network that can reach the target service.

Microsoft has published guidance for the issue at the Microsoft Security Response Center advisory page for CVE-2023-21527. The EPSS score for this CVE has remained flat at a peak of 0.2821 since disclosure, indicating no material increase in observed exploitation interest.

EU & UK References

Vulnerability Data

Windows iSCSI Service Denial of Service Vulnerability

CWE(s)
CWE-191NVD-CWE-noinfo

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-21681Same product: Microsoft Windows 10 1607
CVE-2023-21556Same product: Microsoft Windows 10 1607
CVE-2023-28293Same product: Microsoft Windows 10 1607
CVE-2023-28250Same product: Microsoft Windows 10 1607
CVE-2023-21708Same product: Microsoft Windows 10 1607
CVE-2023-28272Same product: Microsoft Windows 10 1607
CVE-2023-21684Same product: Microsoft Windows 10 1607
CVE-2023-24887Same product: Microsoft Windows 10 1607
CVE-2023-24911Same product: Microsoft Windows 10 1607
CVE-2023-32014Same product: Microsoft Windows 10 1607

Affected Assets

microsoft
windows 10 1607
all versions
microsoft
windows 10 1809
all versions
microsoft
windows 10 20h2
all versions
microsoft
windows 10 21h2
all versions
microsoft
windows 10 22h2
all versions
microsoft
windows 11 21h2
all versions
microsoft
windows 11 22h2
all versions
microsoft
windows 7
all versions
microsoft
windows 8.1
all versions
microsoft
windows rt 8.1
all versions
+5 more product configuration(s) — see NVD for full list

Mitigating Controls

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 full match
prevents

Secure SDLC practices directly prevent integer underflow defects via input validation, bounds checking, and static analysis.

ID.RA-01 partial match
prevents

Vulnerability scanning and code analysis can surface underflow flaws after they are introduced.

PR.PS-02 partial match
prevents

Routine patching can remediate known underflow bugs once they are discovered in deployed software.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development catches integer underflow defects before release.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle mandates input validation and arithmetic checks that prevent integer underflow.

A.8.26 Application security requirements partial match
prevents

Application security requirements include bounds checking and safe arithmetic to avoid underflow conditions.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles require defensive coding patterns that mitigate integer wraparound risks.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly prescribe safe integer handling and overflow/underflow prevention.

References