CVE-2022-21993
Published: 09 February 2022
Summary
CVE-2022-21993 is a high-severity an unspecified weakness vulnerability in Microsoft Windows 10. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 3.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
Windows Services for NFS ONCRPC XDR Driver is affected by an information disclosure vulnerability tracked as CVE-2022-21993. The flaw resides in the kernel-mode driver handling XDR decoding for NFS traffic and carries a CVSS 3.1 base score of 7.5, reflecting network attack vectors that require no authentication or user interaction.
An unauthenticated remote attacker can send specially crafted ONCRPC requests to a system running the vulnerable NFS service and obtain sensitive information from kernel memory. Because the vulnerability permits high-impact confidentiality loss without affecting integrity or availability, successful exploitation can expose internal data structures or memory contents that may aid further attacks.
Microsoft’s security advisory at msrc.microsoft.com details the affected Windows versions and supplies the corresponding security update that resolves the issue; administrators are advised to apply the patch through normal update channels. The EPSS score has remained flat at 0.2397 with no material post-disclosure increase observed.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-27147
Vulnerability details
Windows Services for NFS ONCRPC XDR Driver Information Disclosure Vulnerability
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.