MEDIUM
CVE-2021-43395
CWE-667Published: December 26, 2022· Updated: Jun 17, 2026
5.5
CVSS v3.1
Official Description
An issue was discovered in illumos before f859e7171bb5db34321e45585839c6c3200ebb90, OmniOS Community Edition r151038, OpenIndiana Hipster 2021.04, and SmartOS 20210923. A local unprivileged user can cause a deadlock and kernel panic via crafted rename and rmdir calls on tmpfs filesystems. Oracle Solaris 10 and 11 is also affected.
Technical Analysis
CVE-2021-43395 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
illumos1 product(s)
illumos
joyent1 product(s)
smartos
omniosce1 product(s)
omnios
openindiana1 product(s)
openindiana
Oracle1 product(s)
solaris
Source: NVD CPE · 6 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (18)
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http://www.tribblix.org/relnotes.htmlRelease Notes · Third Party Advisory
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https://github.com/illumos/illumos-gate/commit/f859e7171bb5db34321e45585839c6c3200ebb90Patch · Third Party Advisory
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https://jgardner100.wordpress.com/2022/01/20/security-heads-up/Third Party Advisory
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https://kebe.com/blog/?p=505Third Party Advisory
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https://www.illumos.org/issues/14424Issue Tracking · Patch · Vendor Advisory
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https://www.oracle.com/security-alerts/cpujan2022.htmlPatch · Third Party Advisory
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http://www.tribblix.org/relnotes.htmlRelease Notes · Third Party Advisory
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→
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https://github.com/illumos/illumos-gate/commit/f859e7171bb5db34321e45585839c6c3200ebb90Patch · Third Party Advisory
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https://jgardner100.wordpress.com/2022/01/20/security-heads-up/Third Party Advisory
Quick Facts
CVE IDCVE-2021-43395
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-667
CISA KEVNo
Affected5 vendor(s)
PublishedDec 26, 2022
Related CVEs (CWE-667)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-43395 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.