How severe is CVE-2017-11506?

CVE-2017-11506 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2017-11506 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-11506?

CVE-2017-11506 primarily affects Tenable Nessus. In total, 47 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-11506?

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-2017-11506 published?

CVE-2017-11506 was published on 2017-08-09 and last updated on 2026-06-17.

CVE-2017-11506

CVE-2017-11506 is a high-severity vulnerability in Tenable Nessus with a CVSS 3.x base score of 7.4. 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-295.

Key facts

Severity: High (CVSS 3.x base score 7.4)
CVSS v2: 5.8
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: Tenable Nessus
Published: 2017-08-09
Last modified: 2026-06-17

Description

When linking a Nessus scanner or agent to Tenable.io or other manager, Nessus 6.x before 6.11 does not verify the manager's TLS certificate when making the initial outgoing connection. This could allow man-in-the-middle attacks.

Frequently asked questions

What is CVE-2017-11506?: When linking a Nessus scanner or agent to Tenable.io or other manager, Nessus 6.x before 6.11 does not verify the manager's TLS certificate when making the initial outgoing connection. This could allow man-in-the-middle attacks.
How severe is CVE-2017-11506?: CVE-2017-11506 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2017-11506 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-11506?: CVE-2017-11506 primarily affects Tenable Nessus. In total, 47 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-11506?: 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-2017-11506 published?: CVE-2017-11506 was published on 2017-08-09 and last updated on 2026-06-17.

References

Affected products (47)

cpe:2.3:a:tenable:nessus:6.0.0:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.0.1:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.0.2:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.1.0:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.1.1:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.1.2:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.2.0:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.2.1:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.3.0:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.3.1:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.3.2:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.3.3:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.3.4:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.3.5:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.3.6:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.3.7:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.4.0:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.4.1:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.4.2:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.4.3:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.5.0:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.5.1:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.5.2:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.5.3:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.5.4:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.5.5:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.5.6:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.6.0:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.6.1:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.6.2:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.7.0:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.8.0:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.8.1:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.9.0:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.9.1:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.9.2:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.9.3:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.10.0:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.10.1:*:*:*:*:*:*:*
cpe:2.3:a:tenable:nessus:6.10.2:*:*:*:*:*:*:*

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