CVE-2021-21911
Published: 22 December 2021
Summary
CVE-2021-21911 is a high-severity Incorrect Default Permissions (CWE-276) vulnerability in Advantech R-Seenet. Its CVSS base score is 7.8 (High).
Operationally, ranked at the 11.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-9082
Vulnerability details
A privilege escalation vulnerability exists in the Windows version of installation for Advantech R-SeeNet Advantech R-SeeNet 2.4.15 (30.07.2021). A specially-crafted file can be replaced in the system to escalate privileges to NT SYSTEM authority. An attacker can provide a malicious…
more
file to trigger this 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.
Policy addresses roles, responsibilities, and privilege management to prevent improper privilege assignments.
Implements core proper privilege management by restricting to only required rights.
Baseline configuration documents and controls privilege assignments, making improper privilege management harder to introduce or sustain.
Requiring the most restrictive settings instead of defaults prevents incorrect default permissions on resources.
Defines roles and responsibilities to ensure proper privilege management during configuration changes.
Designates roles and review processes for managing physical privileges and access rights.
Tailoring explicitly overrides or scopes default permission assignments in the baseline to match the system's actual risk and operational needs.
Centralized privilege assignment and oversight prevent ad-hoc or excessive privilege grants that occur when each system is configured independently.