What is CVE-2018-1000155?

CVE-2018-1000155 is a critical-severity vulnerability in Opennetworking Openflow, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2018-05-24.

How severe is CVE-2018-1000155?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Opennetworking Openflow

CVE-2018-1000155

OpenFlow version 1.0 onwards contains a Denial of Service and Improper authorization vulnerability in OpenFlow handshake: The DPID (DataPath IDentifier) in the features_reply message are inherently trusted by the controller. that can result in Denial of Service, Unauthorized Access, Network Instability. This attack appear to be exploitable via Network connectivity: the attacker must first establish a transport connection with the OpenFlow controller and then initiate the OpenFlow handshake.

Vulnerability class: Broken Access Control

Published 2018-05-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Opennetworking Openflow

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

users.sec.t-labs.tu-berlin.de/~hashkash/openflow/BrianOnosSecurityRequest.pdf (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2018-1000155?: CVE-2018-1000155 is a critical-severity vulnerability in Opennetworking Openflow, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2018-05-24.
How severe is CVE-2018-1000155?: Critical severity. CVSS v3 base score is 9.8 out of 10.