What is CVE-2021-3654?

CVE-2021-3654 is a medium-severity vulnerability in OpenStack Nova, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2022-03-02.

How severe is CVE-2021-3654?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-3654 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Open Redirect in OpenStack Nova

CVE-2021-3654

A vulnerability was found in openstack-nova's console proxy, noVNC. By crafting a malicious URL, noVNC could be made to redirect to any desired URL.

Vulnerability class: Open Redirect

Published 2022-03-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.268 (98.0th percentile), scored 2026-10-21.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.268 · newest: 0.268 · change: 0.000

Affected products

OpenStack Nova
Red Hat OpenStack Platform — versions 16.1, 16.2
Openstack-Nova — versions Affects - Nova: <21.2.3, >=22.0.0 <22.2.3, >=23.0.0 <23.0.3 | Fixed-In 21.2.3, 22.3.0, and 23.1.0

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

Public proof-of-concept exploits

References

security.openstack.org/ossa/OSSA-2021-002.html (Patch, Vendor Advisory)
bugs.launchpad.net/nova/+bug/1927677 (Exploit, Patch, Third Party Advisory, Issue Tracking)
www.openwall.com/lists/oss-security/2021/07/29/2 (Patch, Mailing List, Third Party Advisory)
bugs.python.org/issue32084 (Patch, Third Party Advisory)
opendev.org/openstack/nova/commit/04d48527b62a35d912f93bc75613a6cca606df66 (Patch, Vendor Advisory)
opendev.org/openstack/nova/commit/8906552cfc2525a44251d4cf313ece61e57251eb (Patch, Vendor Advisory)
bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
security.gentoo.org/glsa/202305-02 (vendor-advisory)

Frequently asked questions

What is CVE-2021-3654?: CVE-2021-3654 is a medium-severity vulnerability in OpenStack Nova, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2022-03-02.
How severe is CVE-2021-3654?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-3654 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.