How severe is CVE-2016-8520?

CVE-2016-8520 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-8520 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-8520?

CVE-2016-8520 affects Eucalyptus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-8520?

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-2016-8520 published?

CVE-2016-8520 was published on 2018-02-15 and last updated on 2026-06-17.

CVE-2016-8520

CVE-2016-8520 is a high-severity vulnerability in Eucalyptus with a CVSS 3.x base score of 8.8. 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-275.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-275
Affected product: Eucalyptus
Published: 2018-02-15
Last modified: 2026-06-17

Description

HPE Helion Eucalyptus v4.3.0 and earlier does not correctly check IAM user's permissions for accessing versioned objects and ACLs. In some cases, authenticated users with S3 permissions could also access versioned data.

Frequently asked questions

What is CVE-2016-8520?: HPE Helion Eucalyptus v4.3.0 and earlier does not correctly check IAM user's permissions for accessing versioned objects and ACLs. In some cases, authenticated users with S3 permissions could also access versioned data.
How severe is CVE-2016-8520?: CVE-2016-8520 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-8520 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-8520?: CVE-2016-8520 affects Eucalyptus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-8520?: 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-2016-8520 published?: CVE-2016-8520 was published on 2018-02-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:eucalyptus:eucalyptus:*:*:*:*:*:*:*:*

More vulnerabilities in Eucalyptus

CVE-2013-4767 — Critical (CVSS 10.0): Unspecified vulnerability in Eucalyptus before 3.3.2 has unknown impact and attack vectors.
CVE-2016-8528 — High (CVSS 8.8): A Remote Escalation of Privilege vulnerability in HPE Helion Eucalyptus version 3.3.0 through 4.3.1 was found.
CVE-2015-6861 — High (CVSS 7.5): HPE Helion Eucalyptus 3.4.0 through 4.2.0 allows remote authenticated users to bypass an intended AssumeRole permission…
CVE-2012-3241 — High (CVSS 7.5): The VMware Broker in Eucalyptus 2.0.3 and 3.0.x before 3.0.2 does not properly authenticate SOAP requests, which allows…
CVE-2012-3240 — High (CVSS 7.5): The Walrus service in Eucalyptus 2.0.3 and 3.0.x before 3.0.2 allows remote attackers to gain administrator privileges…
CVE-2010-3905 — High (CVSS 7.5): The password reset feature in the administrator interface for Eucalyptus 2.0.0 and 2.0.1 does not perform…

All CVEs affecting Eucalyptus →

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