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AUSCERT External Security Bulletin Redistribution
Nessus Agent 8.3.1 Fixes Multiple Vulnerabilities
8 September 2021
AusCERT Security Bulletin Summary
Product: Nessus Agent
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
CVE Names: CVE-2021-20118 CVE-2021-20117
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[R1] Nessus Agent 8.3.1 Fixes Multiple Vulnerabilities
Nessus Agent 8.3.0 and earlier for were found to contain multiple local
privilege escalation vulnerabilities which could allow an authenticated, local
administrator to run specific executables on the Nessus Agent host.
Tenable has released Nessus Agent 8.3.1 to address these issues. The
installation files can be obtained from the Tenable Downloads Portal ( https://
This page contains information regarding security vulnerabilities that may
impact Tenable's products. This may include issues specific to our software, or
due to the use of third-party libraries within our software. Tenable strongly
encourages users to ensure that they upgrade or apply relevant patches in a
Tenable takes product security very seriously. If you believe you have found a
vulnerability in one of our products, we ask that you please work with us to
quickly resolve it in order to protect customers. Tenable believes in
responding quickly to such reports, maintaining communication with researchers,
and providing a solution in short order.
For more details on submitting vulnerability information, please see our
Vulnerability Reporting Guidelines page.
If you have questions or corrections about this advisory, please email
CVE ID: CVE-2021-20117
Tenable Advisory ID:
CVSSv3 Base / Temporal Score:
6.5 / 5.7 (CVE-2021-20117)
8.4 / 7.3 (CVE-2021-20118)
Nessus Agent 8.3.0 and earlier
2021-09-07 - [R1] Initial Release
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