How severe is CVE-2016-6561?

CVE-2016-6561 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-6561 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6561?

CVE-2016-6561 affects Illumos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-6561?

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-2016-6561 published?

CVE-2016-6561 was published on 2017-03-31 and last updated on 2026-06-17.

CVE-2016-6561

CVE-2016-6561 is a high-severity vulnerability in Illumos with a CVSS 3.x base score of 7.5. 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Illumos
Published: 2017-03-31
Last modified: 2026-06-17

Description

illumos smbsrv NULL pointer dereference allows system crash.

Frequently asked questions

What is CVE-2016-6561?: illumos smbsrv NULL pointer dereference allows system crash.
How severe is CVE-2016-6561?: CVE-2016-6561 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2016-6561 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6561?: CVE-2016-6561 affects Illumos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-6561?: 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-2016-6561 published?: CVE-2016-6561 was published on 2017-03-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:illumos:illumos:-:*:*:*:*:*:*:*

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Other CWE-476 (NULL Pointer Dereference) vulnerabilities

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CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
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Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →