How severe is CVE-2016-4911?

CVE-2016-4911 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2016-4911 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-2016-4911?

CVE-2016-4911 primarily affects Keystone Openstack Identity. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-4911?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-4911 published?

CVE-2016-4911 was published on 2016-06-13 and last updated on 2026-06-17.

CVE-2016-4911

CVE-2016-4911 is a medium-severity vulnerability in Keystone Openstack Identity with a CVSS 3.x base score of 4.3. 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-284.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Keystone Openstack Identity
Published: 2016-06-13
Last modified: 2026-06-17

Description

The Fernet Token Provider in OpenStack Identity (Keystone) 9.0.x before 9.0.1 (mitaka) allows remote authenticated users to prevent revocation of a chain of tokens and bypass intended access restrictions by rescoping a token.

Frequently asked questions

What is CVE-2016-4911?: The Fernet Token Provider in OpenStack Identity (Keystone) 9.0.x before 9.0.1 (mitaka) allows remote authenticated users to prevent revocation of a chain of tokens and bypass intended access restrictions by rescoping a token.
How severe is CVE-2016-4911?: CVE-2016-4911 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2016-4911 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-2016-4911?: CVE-2016-4911 primarily affects Keystone Openstack Identity. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-4911?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-4911 published?: CVE-2016-4911 was published on 2016-06-13 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:keystone:openstack_identity:9.0.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:keystone:openstack_identity:9.0.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:keystone:openstack_identity:9.0.0.0:rc3:*:*:*:*:*:*

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