CVE-2021-47664
Published: 24 April 2025
Summary
CVE-2021-47664 is a medium-severity Observable Discrepancy (CWE-203) vulnerability in Sciencedirect (inferred from references). Its CVSS base score is 5.3 (Medium).
Operationally, ranked in the top 40.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-12117
Vulnerability details
Due to improper authentication mechanism an unauthenticated remote attacker can enumerate valid usernames.
- 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.
Misdirection can normalize or falsify responses to eliminate observable discrepancies that aid reconnaissance.
Observable discrepancies in system behavior can be modulated to create covert storage or timing channels; the required analysis detects and constrains such avenues.
Prevents attackers from using observable differences in error responses to infer internal system details or state.