How severe is CVE-2020-5774?

CVE-2020-5774 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2020-5774 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5774?

CVE-2020-5774 affects Tenable Nessus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-5774?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-5774 published?

CVE-2020-5774 was published on 2020-08-21 and last updated on 2026-06-17.

CVE-2020-5774

CVE-2020-5774 is a high-severity vulnerability in Tenable Nessus with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-613.

Key facts

Severity: High (CVSS 3.x base score 7.1)
CVSS v2: 3.6
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-613
Affected product: Tenable Nessus
Published: 2020-08-21
Last modified: 2026-06-17

Description

Nessus versions 8.11.0 and earlier were found to maintain sessions longer than the permitted period in certain scenarios. The lack of proper session expiration could allow attackers with local access to login into an existing browser session.

Frequently asked questions

What is CVE-2020-5774?: Nessus versions 8.11.0 and earlier were found to maintain sessions longer than the permitted period in certain scenarios. The lack of proper session expiration could allow attackers with local access to login into an existing browser session.
How severe is CVE-2020-5774?: CVE-2020-5774 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2020-5774 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5774?: CVE-2020-5774 affects Tenable Nessus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-5774?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-5774 published?: CVE-2020-5774 was published on 2020-08-21 and last updated on 2026-06-17.

References

https://www.tenable.com/security/tns-2020-06

Affected products (1)

cpe:2.3:a:tenable:nessus:*:*:*:*:*:*:*:*

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