CVE-2024-20670
Published: 09 April 2024
Summary
CVE-2024-20670 is a high-severity Improper Input Validation (CWE-20) vulnerability in Microsoft Outlook. Its CVSS base score is 8.1 (High).
Operationally, ranked in the top 9.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2024-20670 is a spoofing vulnerability in Outlook for Windows, assigned a CVSS 3.1 base score of 8.1 under the vector string AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N. The weakness is categorized under CWE-20 and was disclosed on 9 April 2024.
An unauthenticated remote attacker can exploit the issue by sending specially crafted content that the victim must interact with, resulting in high-impact spoofing that affects confidentiality and integrity without impacting availability.
Microsoft has published an advisory for the vulnerability at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20670 that practitioners should consult for patch availability and mitigation guidance.
The EPSS score for the CVE stands at 0.0512 with an identical recorded peak, showing no material upward trajectory after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-18385
Vulnerability details
Outlook for Windows Spoofing Vulnerability
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Security testing and developer training directly verify and enforce proper input validation, reducing exploitability of injection and malformed-data weaknesses.
Security testing and evaluation at multiple SDLC stages directly detects missing or flawed input validation, with the required remediation process ensuring fixes are applied.
Directly implements checks on information inputs to reject invalid data before processing.
Spam protection mechanisms perform filtering and detection on inbound/outbound messages, directly compensating for missing or weak input validation of unsolicited content.