Attacker Value
Unknown
0
CVE-2021-20321
0
CVE ID
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CVE-2021-20321
(Last updated October 07, 2023) ▾
MITRE ATT&CK
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Command and Control
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Defense Evasion
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Execution
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Initial Access
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Persistence
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Description
A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system.
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CVSS V3 Severity and Metrics
Data provided by the National Vulnerability Database (NVD)
Base Score:
4.7 Medium
Impact Score:
3.6
Exploitability Score:
1
Attack Vector (AV):
Local
Attack Complexity (AC):
High
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
High
General Information
Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
kernel kernel 5.15-rc5
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown
Vendors
- debian,
- linux,
- redhat
Products
- debian linux 10.0,
- debian linux 9.0,
- enterprise linux 7.0,
- enterprise linux 8.0,
- linux kernel,
- linux kernel 5.15
References
Additional Info
Authenticated
Unknown
Exploitable
Unknown
Reliability
Unknown
Stability
Unknown
Available Mitigations
Unknown
Shelf Life
Unknown
Userbase/Installbase
Unknown
Patch Effectiveness
Unknown
Rapid7
Technical Analysis
Report as Emergent Threat Response
Report as Exploited in the Wild
CVE ID
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