CVE-2019-9735

Exp

An issue was discovered in the iptables firewall module in OpenStack Neutron before 10.0.8, 11.x before 11.0.7, 12.x before 12.0.6, and 13.x before 13.0.3. By setting a destination port in a security group rule along with a protocol that doesn't support that option (for example, VRRP), an authenticated user may block further application of security group rules for instances from any project/tenant on the compute hosts to which it's applied. (Only deployments using the iptables security group driver are affected.)

Published: 2019-03-12 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-9735 is rated High Exploit Risk (73.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 3.67%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.78% over the last day, indicating growing attacker interest. 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-2019-9735

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

Exploit prediction scoring system (EPSS) score for CVE-2019-9735

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 1.89% 3.67% +1.78%
2 2026-02-11 2.00% 1.89% -0.11%
3 2025-11-21 — 2.00% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-9735

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: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: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: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.
 2.8 3.6 [email protected]
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/C:N/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:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2019-9735

GitHub Security Advisory for CVE-2019-9735

GHSA-9773-3fqg-8w25 · Severity: high · Ecosystem: pip — OpenStack Neutron's unsupported dport option prevents applying security groups

OS Trackers for CVE-2019-9735

vendor priority summary link
debian not yet assigned CVE-2019-9735 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-2019-9735
redhat high — https://access.redhat.com/security/cve/CVE-2019-9735
suse medium CVE-2019-9735 severity moderate: SUSE including 296 source package names (ardana-ansible-8.0+git.1560208949.67048e3-3.64.1, ardana-ansible-9.0+git.1566374020.301191f-3.7.2, …), 612 product×package rows across 5 product lines (HPE Helion OpenStack 8, SUSE OpenStack Cloud 8, … (5 product lines)): Fixed 612. https://www.suse.com/security/cve/CVE-2019-9735/
ubuntu medium CVE-2019-9735 medium priority: Ubuntu including 1 source packages (neutron), 6 status rows across 6 suites (bionic, cosmic, disco, trusty, upstream, xenial): released 4, DNE 1, not-affected 1. https://ubuntu.com/security/CVE-2019-9735

Affected software / configurations for CVE-2019-9735

Vendor Product Version Raw CPE
openstack neutron < 10.0.8 cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*
openstack neutron >= 11.0.0, < 11.0.7 cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*
openstack neutron >= 12.0.0, < 12.0.6 cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*
openstack neutron >= 13.0.0, < 13.0.3 cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*
redhat openstack 10 cpe:2.3:a:redhat:openstack:10:*:*:*:*:*:*:*
redhat openstack 13 cpe:2.3:a:redhat:openstack:13:*:*:*:*:*:*:*
redhat openstack 14 cpe:2.3:a:redhat:openstack:14:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

References for CVE-2019-9735

cvelogic Threat Intelligence