CVE-2016-5363 [High] | Spoofing in Neutron

The IPTables firewall in OpenStack Neutron before 7.0.4 and 8.0.0 through 8.1.0 allows remote attackers to bypass an intended MAC-spoofing protection mechanism and consequently cause a denial of service or intercept network traffic via (1) a crafted DHCP discovery message or (2) crafted non-IP traffic.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	4.75%	3.18%	-1.57%
2	2025-08-25	1.30%	4.75%	+3.45%
3	2025-03-30	—	1.30%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

4.75%

3.18%

-1.57%

2025-08-25

1.30%

4.75%

+3.45%

2025-03-30

—

1.30%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.2	3.0	HIGH	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H` 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: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:L) Some sensitive info could get out, but not a total data dump. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	4.2	[email protected]
6.4	2.0	MEDIUM	`AV:N/AC:L/Au:N/C:P/I:N/A:P` 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:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	10.0	4.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.2

3.0

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H 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: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:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

4.2

[email protected]

6.4

2.0

MEDIUM

AV:N/AC:L/Au:N/C:P/I:N/A:P 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:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

4.9

[email protected]

OS Trackers for CVE-2016-5363

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2016-5363 not yet assigned priority: Debian including 1 source packages (neutron), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2016-5363
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2016-5363
`suse`	medium	CVE-2016-5363 severity moderate: SUSE including 80 source package names (openstack-ceilometer-5.0.4~a0~dev6-6.1, openstack-ceilometer-agent-central-5.0.4~a0~dev6-6.1, …), 80 product×package rows across 1 product lines (SUSE OpenStack Cloud 6): Fixed 80.	https://www.suse.com/security/cve/CVE-2016-5363/
`ubuntu`	low	CVE-2016-5363 low priority: Ubuntu including 1 source packages (neutron), 11 status rows across 11 suites (artful, bionic, cosmic, disco, precise, trusty, upstream, wily, xenial, yakkety, zesty): not-affected 6, DNE 2, ignored 2, needs-triage 1.	https://ubuntu.com/security/CVE-2016-5363

Affected software / configurations for CVE-2016-5363

Vendor	Product	Version	Raw CPE
openstack	neutron	7.0.0	cpe:2.3:a:openstack:neutron:7.0.0:::::::*
openstack	neutron	7.0.1	cpe:2.3:a:openstack:neutron:7.0.1:::::::*
openstack	neutron	7.0.2	cpe:2.3:a:openstack:neutron:7.0.2:::::::*
openstack	neutron	7.0.3	cpe:2.3:a:openstack:neutron:7.0.3:::::::*
openstack	neutron	7.0.4	cpe:2.3:a:openstack:neutron:7.0.4:::::::*
openstack	neutron	8.0.0	cpe:2.3:a:openstack:neutron:8.0.0:::::::*
openstack	neutron	8.1.0	cpe:2.3:a:openstack:neutron:8.1.0:::::::*

References for CVE-2016-5363

URL	Tags
http://www.openwall.com/lists/oss-security/2016/06/10/5
http://www.openwall.com/lists/oss-security/2016/06/10/6
https://access.redhat.com/errata/RHSA-2016:1473
https://access.redhat.com/errata/RHSA-2016:1474
https://bugs.launchpad.net/neutron/+bug/1558658
https://review.openstack.org/#/c/299021/
https://review.openstack.org/#/c/299023/
https://review.openstack.org/#/c/299025/
https://security.openstack.org/ossa/OSSA-2016-009.html	Vendor Advisory

URL

CVE-2016-5363

Exploit prediction scoring system (EPSS) score for CVE-2016-5363

Common vulnerability scoring system (CVSS) metrics for CVE-2016-5363

Weakness enumeration for CVE-2016-5363

GitHub Security Advisory for CVE-2016-5363

OS Trackers for CVE-2016-5363

Affected software / configurations for CVE-2016-5363

References for CVE-2016-5363