CVE-2021-3654

Exp

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.

Published: 2022-03-02 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-3654 is rated High Exploit Risk (73/100): CVSS Medium severity, with high exploitation likelihood (EPSS 87.18%, 99th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-3654

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-3654

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-25 88.37% 87.18% -1.19%
2 2026-05-04 87.25% 88.37% +1.12%
3 2026-03-04 — 87.25% —

Full EPSS history (59 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-3654

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
4.0 2.0 MEDIUM
AV:N/AC:H/Au:N/C:P/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:H)
Exploitation requires uncommon or highly specific conditions.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 4.9 4.9 [email protected]

Weakness enumeration for CVE-2021-3654

GitHub Security Advisory for CVE-2021-3654

GHSA-vqp6-j452-j6wp · Severity: medium · Ecosystem: pip — Open Redirect in CPython that affects users of OpenStack Nova

OS Trackers for CVE-2021-3654

vendor priority summary link
debian not yet assigned CVE-2021-3654 not yet assigned priority: Debian including 1 source packages (nova), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 4, open 1. https://security-tracker.debian.org/tracker/CVE-2021-3654
gentoo high CVE-2021-3654: 1 GLSA(s) (202305-02), 2 atom(s) (dev-lang/python, dev-python/pypy3); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-3654
redhat medium — https://access.redhat.com/security/cve/CVE-2021-3654
suse medium CVE-2021-3654 severity moderate: SUSE including 13 source package names (openstack-nova, openstack-nova-api, …), 63 product×package rows across 5 product lines (HPE Helion OpenStack 8, SUSE OpenStack Cloud 8, … (5 product lines)): Will Not Fix 63. https://www.suse.com/security/cve/CVE-2021-3654/
ubuntu low CVE-2021-3654 low priority: Ubuntu including 1 source packages (nova), 9 status rows across 9 suites (bionic, focal, hirsute, impish, jammy, kinetic, trusty, upstream, xenial): released 3, ignored 2, not-affected 2, DNE 1, needs-triage 1. https://ubuntu.com/security/CVE-2021-3654

Affected software / configurations for CVE-2021-3654

Vendor Product Version Raw CPE
openstack nova < 21.2.3 cpe:2.3:a:openstack:nova:*:*:*:*:*:*:*:*
openstack nova >= 22.0.0, < 22.2.3 cpe:2.3:a:openstack:nova:*:*:*:*:*:*:*:*
openstack nova >= 23.0.0, < 23.0.3 cpe:2.3:a:openstack:nova:*:*:*:*:*:*:*:*
redhat openstack_platform 16.1 cpe:2.3:a:redhat:openstack_platform:16.1:*:*:*:*:*:*:*
redhat openstack_platform 16.2 cpe:2.3:a:redhat:openstack_platform:16.2:*:*:*:*:*:*:*

References for CVE-2021-3654

cvelogic Threat Intelligence