What is CVE-2018-1002104?

CVE-2018-1002104 is a medium-severity vulnerability in Kubernetes K8s.gcr.io/defaultbackend, classified under Insertion of Sensitive Information Into Debugging Code. CVSS score: 5.3/10. Published 2020-01-14.

How severe is CVE-2018-1002104?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Improper input validation in Kubernetes K8s.gcr.io/defaultbackend

CVE-2018-1002104

Versions < 1.5 of the Kubernetes ingress default backend, which handles invalid ingress traffic, exposed prometheus metrics publicly.

Published 2020-01-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.011 (66.1th percentile), scored 2026-10-21.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Kubernetes K8s.gcr.io/defaultbackend — versions defaultbackend
Kubernetes nginx Ingress Controller

Weakness classification (CWE)

References

github.com/kubernetes/ingress-nginx/pull/3125 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-1002104?: CVE-2018-1002104 is a medium-severity vulnerability in Kubernetes K8s.gcr.io/defaultbackend, classified under Insertion of Sensitive Information Into Debugging Code. CVSS score: 5.3/10. Published 2020-01-14.
How severe is CVE-2018-1002104?: Medium severity. CVSS v3 base score is 5.3 out of 10.