Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2023-21811 is a high-severity Buffer Over-read (CWE-126) vulnerability in Microsoft Windows Server 2008. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Protocol or Service Impersonation (T1001.003); ranked in the top 24% 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.
CVE-2023-21811 is a denial of service vulnerability in the Windows iSCSI Service, assigned a CVSS 3.1 base score of 7.5 with the vector string AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. The associated CWEs are CWE-126 and NVD-CWE-noinfo. It was published on 14 February 2023.
Remote unauthenticated attackers can exploit the flaw over the network with low attack complexity to produce a high impact on availability while leaving confidentiality and integrity unaffected. No user interaction or privileges are required.
Microsoft security advisories at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21811 describe the issue and corresponding updates. The EPSS score remains flat at 0.1705 with no material rise from a lower baseline.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-25977
Vulnerability Data
Windows iSCSI Service Denial of Service Vulnerability
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
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.
Vulnerability identification processes can discover buffer over-read flaws via scanning or review.
Patching or replacing vulnerable software removes known instances of buffer over-read bugs.
Secure development practices directly prevent introduction of buffer over-read weaknesses.
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.