CVE-2017-16239

In OpenStack Nova through 14.0.9, 15.x through 15.0.7, and 16.x through 16.0.2, by rebuilding an instance, an authenticated user may be able to circumvent the Filter Scheduler bypassing imposed filters (for example, the ImagePropertiesFilter or the IsolatedHostsFilter). All setups using Nova Filter Scheduler are affected. Because of the regression described in Launchpad Bug #1732947, the preferred fix is a 14.x version after 14.0.10, a 15.x version after 15.0.8, or a 16.x version after 16.0.3.

Published: 2017-11-14 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-16239 is rated Moderate Risk (51.2/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.41%). EPSS rose +1.01% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2017-16239

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 2026-06-15 0.40% 1.41% +1.01%
2 2025-03-30 1.27% 0.40% -0.88%
3 2025-03-29 — 1.27% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-16239

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 [email protected]
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2017-16239

GitHub Security Advisory for CVE-2017-16239

GHSA-w2wf-cgwh-vpqg · Severity: medium · Ecosystem: pip — OpenStack Nova Filter Scheduler Bypass

OS Trackers for CVE-2017-16239

vendor priority summary link
debian not yet assigned CVE-2017-16239 not yet assigned priority: Debian including 1 source packages (nova), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-16239
redhat medium — https://access.redhat.com/security/cve/CVE-2017-16239
suse medium CVE-2017-16239 severity moderate: SUSE including 15 source package names (openstack-nova-14.0.10~dev13-4.11.1, openstack-nova-api-14.0.10~dev13-4.11.1, …), 15 product×package rows across 1 product lines (SUSE OpenStack Cloud 7): Fixed 15. https://www.suse.com/security/cve/CVE-2017-16239/
ubuntu low CVE-2017-16239 low priority: Ubuntu including 1 source packages (nova), 7 status rows across 7 suites (artful, bionic, cosmic, trusty, upstream, xenial, zesty): not-affected 3, ignored 2, DNE 1, needs-triage 1. https://ubuntu.com/security/CVE-2017-16239

Affected software / configurations for CVE-2017-16239

Vendor Product Version Raw CPE
openstack nova <= 14.0.9 cpe:2.3:a:openstack:nova:*:*:*:*:*:*:*:*
openstack nova 15.0.0 cpe:2.3:a:openstack:nova:15.0.0:*:*:*:*:*:*:*
openstack nova 15.0.1 cpe:2.3:a:openstack:nova:15.0.1:*:*:*:*:*:*:*
openstack nova 15.0.2 cpe:2.3:a:openstack:nova:15.0.2:*:*:*:*:*:*:*
openstack nova 15.0.3 cpe:2.3:a:openstack:nova:15.0.3:*:*:*:*:*:*:*
openstack nova 15.0.4 cpe:2.3:a:openstack:nova:15.0.4:*:*:*:*:*:*:*
openstack nova 15.0.5 cpe:2.3:a:openstack:nova:15.0.5:*:*:*:*:*:*:*
openstack nova 15.0.6 cpe:2.3:a:openstack:nova:15.0.6:*:*:*:*:*:*:*
openstack nova 15.0.7 cpe:2.3:a:openstack:nova:15.0.7:*:*:*:*:*:*:*
openstack nova 16.0.0 cpe:2.3:a:openstack:nova:16.0.0:*:*:*:*:*:*:*
openstack nova 16.0.1 cpe:2.3:a:openstack:nova:16.0.1:*:*:*:*:*:*:*
openstack nova 16.0.2 cpe:2.3:a:openstack:nova:16.0.2:*:*:*:*:*:*:*

References for CVE-2017-16239

cvelogic Threat Intelligence