CVE-2021-20076 Deserialization in Tenable.sc

High 8.8 Published 3 Mar 2021 Updated 3 Aug 2024

An authenticated unprivileged user can achieve remote code execution on the Tenable.sc server via unsafe PHP unserialization.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-20076?

CVE-2021-20076 is a high-severity unsafe deserialization vulnerability in Tenable.sc, published on 3 Mar 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Tenable.sc and Tenable.sc Core versions 5.13.0 through 5.17.0 were found to contain a vulnerability that could allow an authenticated, unprivileged user to perform Remote Code Execution (RCE) on the Tenable.sc server via Hypertext Preprocessor unserialization.

Weakness: CWE-502

Which versions are affected by CVE-2021-20076?

It affects 1 product.

Products include Tenable Tenable.sc.

How do I fix CVE-2021-20076?

No fix has been published for CVE-2021-20076 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2021-20076 being exploited?

There is no known exploitation of CVE-2021-20076 in the wild and no public exploit code.

Sources

Also known as GHSA-3ccq-6jj2-4rxc.