CVE-2021-43215
Critical
Published: 15 December 2021
Published
15 December 2021
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score
0.0456
89.4th percentile
Risk Priority
22
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-43215 is a critical-severity Out-of-bounds Write (CWE-787) vulnerability in Microsoft Windows 10. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 10.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-30159
Vulnerability details
iSNS Server Memory Corruption Vulnerability Can Lead to Remote Code Execution
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
microsoft
windows 10
1607, 1809, 1909, 2004, 20h2
microsoft
windows 11
all versions
microsoft
windows 7
all versions
microsoft
windows 8.1
all versions
microsoft
windows rt 8.1
all versions
microsoft
windows server
2022, 20h2
microsoft
windows server 2008
r2
microsoft
windows server 2012
all versions, r2
microsoft
windows server 2016
2004, all versions
microsoft
windows server 2019
all versions
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.
addresses: CWE-787
Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.