CVE-2016-4911

Name: CVE-2016-4911
Creator: NVD / NIST
Published: 2016-06-13T14:59:07.323+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 1.40%

Last modified Jun 17, 2026

CVE-2016-4911 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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.. EPSS estimates a 1.40% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

1.40%

69.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions	Update
Keystone	Openstack Identity	9.0.0.0	Rc1

References

http://www.openwall.com/lists/oss-security/2016/05/17/10Mailing List
http://www.openwall.com/lists/oss-security/2016/05/17/11Mailing List
http://www.securityfocus.com/bid/90728Third Party Advisory, VDB Entry
https://bugs.launchpad.net/keystone/+bug/1577558Vendor Advisory
https://review.openstack.org/#/c/311886/Vendor Advisory
https://security.openstack.org/ossa/OSSA-2016-008.htmlPatch, Vendor Advisory
http://www.openwall.com/lists/oss-security/2016/05/17/10Mailing List
http://www.openwall.com/lists/oss-security/2016/05/17/11Mailing List
http://www.securityfocus.com/bid/90728Third Party Advisory, VDB Entry
https://bugs.launchpad.net/keystone/+bug/1577558Vendor Advisory
https://review.openstack.org/#/c/311886/Vendor Advisory
https://security.openstack.org/ossa/OSSA-2016-008.htmlPatch, Vendor Advisory

Timeline

Published: Jun 13, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-4911?

How severe is CVE-2016-4911?

CVE-2016-4911 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 1.40% probability of exploitation in the next 30 days.

How do I fix CVE-2016-4911?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-4911?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST