Raw vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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-2023-33133 is a high-severity Heap-based Buffer Overflow (CWE-122) vulnerability in Microsoft Excel. Its CVSS base score is 7.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Data Obfuscation (T1001); ranked in the top 1% 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.
Microsoft Excel contains a remote code execution vulnerability tracked as CVE-2023-33133 and assigned a CVSS score of 7.8. The flaw is associated with CWE-122 and affects the application's handling of certain inputs, enabling code execution when a crafted document is processed.
An unauthenticated attacker can exploit the issue by supplying a malicious Excel file that a user must open locally. Successful exploitation grants high-impact control over confidentiality, integrity, and availability on the target system without requiring elevated privileges.
Microsoft has published remediation guidance in its Security Response Center advisory for this vulnerability, and additional technical analysis is available from Cisco Talos. The associated EPSS score has remained at 0.3721 since disclosure with no material increase observed.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-37319
Vulnerability Data
Microsoft Excel Remote Code Execution Vulnerability
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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V1.4.1
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 scanning and recording can discover heap-overflow flaws but does not prevent their introduction in code.
Timely patching removes known heap-overflow instances after they exist.
Secure-development practices directly require bounds checking and safe memory handling that prevent heap overflows.
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.