CVE-2021-21995
High
Published: 13 July 2021
Published
13 July 2021
Modified
31 October 2025
KEV Added
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Patch
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CVSS Score v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score
0.0047
64.8th percentile
Risk Priority
15
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-21995 is a high-severity Out-of-bounds Read (CWE-125) vulnerability in Vmware Esxi. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 35.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-9166
Vulnerability details
OpenSLP as used in ESXi has a denial-of-service vulnerability due a heap out-of-bounds read issue. A malicious actor with network access to port 427 on ESXi may be able to trigger a heap out-of-bounds read in OpenSLP service resulting in…
more
a denial-of-service condition.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
vmware
cloud foundation
3.0 — 3.10.2 · 4.0 — 4.3
vmware
esxi
6.5, 6.7, 7.0
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.