GHSA-cpx3-696p-3cw9 · Severity: high · Ecosystem: pip — OpenStack Neutron Denial of Service vulnerability
An issue was discovered in the routes middleware in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1. By making API requests involving nonexistent controllers, an authenticated user may cause the API worker to consume increasing amounts of memory, resulting in API performance degradation or denial of service.
Conclusion & alert: CVE-2021-40797 is rated High Exploit Risk (68/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.70%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.01% over the last day, indicating growing attacker interest. Mandatory action: 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.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
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 | 0.69% | 1.70% | +1.01% |
| 2 | 2026-05-15 | 0.93% | 0.69% | -0.24% |
| 3 | 2026-05-12 | — | 0.93% | — |
Full EPSS history (18 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.5 | 3.1 | MEDIUM |
|
2.8 | 3.6 | [email protected] |
| 4.0 | 2.0 | MEDIUM |
|
8.0 | 2.9 | [email protected] |
GHSA-cpx3-696p-3cw9 · Severity: high · Ecosystem: pip — OpenStack Neutron Denial of Service vulnerability
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2021-40797 unimportant 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-2021-40797 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2021-40797 |
suse
|
medium | CVE-2021-40797 severity moderate: SUSE including 12 source package names (openstack-neutron-11.0.9~dev69-3.43.1, openstack-neutron-dhcp-agent-11.0.9~dev69-3.43.1, …), 36 product×package rows across 3 product lines (HPE Helion OpenStack 8, SUSE OpenStack Cloud 8, SUSE OpenStack Cloud Crowbar 8): Fixed 36. | https://www.suse.com/security/cve/CVE-2021-40797/ |
ubuntu
|
medium | CVE-2021-40797 medium priority: Ubuntu including 1 source packages (neutron), 15 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 9, released 3, DNE 1, ignored 1, needs-triage 1. | https://ubuntu.com/security/CVE-2021-40797 |
| URL | Tags |
|---|---|
| http://www.openwall.com/lists/oss-security/2021/09/09/2 | Mailing List Patch Third Party Advisory |
| https://launchpad.net/bugs/1942179 | Exploit Issue Tracking Third Party Advisory |
| https://security.openstack.org/ossa/OSSA-2021-006.html | Patch Vendor Advisory |