CVE-2021-20076

Name: CVE-2021-20076
Creator: NVD / NIST
Published: 2021-03-03T17:15:11.91+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.98%

Last modified Jun 17, 2026

CVE-2021-20076 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 1.98% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.98%

78.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
Tenable	Tenable.Sc	>= 5.13.0, <= 5.17.0

References

https://www.tenable.com/security/tns-2021-03Vendor Advisory
https://www.tenable.com/security/tns-2021-03Vendor Advisory

Timeline

Published: Mar 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20076?

How severe is CVE-2021-20076?

CVE-2021-20076 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.98% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20076?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20076?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST