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Fencer Intel
medium 6.3

CVE-2020-8555 json

Kubernetes kube-controller-manager SSRF

published 6y ago modified last mo. also GHSA-x6mj-w4jf-jmgw , GO-2022-0890 , EUVD-2022-1249

cvss
6.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.7%
EPSS 3.7% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

The Kubernetes kube-controller-manager in versions v1.0-1.14, versions prior to v1.15.12, v1.16.9, v1.17.5, and version v1.18.0 are vulnerable to a Server Side Request Forgery (SSRF) that allows certain authorized users to leak up to 500 bytes of arbitrary information from unprotected endpoints within the master's host network (such as link-local or loopback services).

Patch / fix

  • go k8s.io/kubernetes 1.15.12, 1.16.9, 1.17.4, 1.18.1
  • Kubernetes Kubernetes 1.15.12, 1.16.9, 1.17.5
  • kubernetes Debian 14, Debian 13, Debian 12 1.18.2-1

debian advisories DEBIAN-CVE-2020-8555

  • atomic-openshift openshift 3.11 3.11.232-1.git.0.a5bc32f.el7
  • atomic-openshift-pod openshift 3.11 3.11.232-1.git.0.a5bc32f.el7
  • atomic-openshift-node openshift 3.11 3.11.232-1.git.0.a5bc32f.el7
  • atomic-openshift-tests openshift 3.11 3.11.232-1.git.0.a5bc32f.el7
  • atomic-openshift-master openshift 3.11 3.11.232-1.git.0.a5bc32f.el7
  • atomic-openshift-clients openshift 3.11 3.11.232-1.git.0.a5bc32f.el7
  • atomic-openshift-sdn-ovs openshift 3.11 3.11.232-1.git.0.a5bc32f.el7
  • atomic-openshift-excluder openshift 3.11 3.11.232-1.git.0.a5bc32f.el7

red hat advisories RHSA-2020:2479RHSA-2020:2594RHSA-2020:2448RHSA-2020:2440

  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20250807T150727-1.1

opensuse advisories openSUSE-SU-2025:15424-1

  • k3s Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 1.18.3.1-r0

alpine advisories ALPINE-CVE-2020-8555

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-8555 updated cvss 6.3

kubernetes: Server side request forgery (SSRF) in kube-controller-manager allows users to leak secret information

  • Red Hat Storage 3 heketi, heketi-client, python-heketi
    affected: workaround, no fix available “Restrict use of the vulnerable volume type and restrict StorageClass write permissions via RBAC”
  • Red Hat OpenShift Container Platform 3.11 atomic-openshift 3.11.232-1.git.0.a5bc32f.el7, atomic-openshift-pod 3.11.232-1.git.0.a5bc32f.el7, atomic-openshift-node 3.11.232-1.git.0.a5bc32f.el7, atomic-openshift-tests 3.11.232-1.git.0.a5bc32f.el7, atomic-openshift-master 3.11.232-1.git.0.a5bc32f.el7, atomic-openshift-clients 3.11.232-1.git.0.a5bc32f.el7, +7 more
    fixed: vendor fix “Restrict use of the vulnerable volume type and restrict StorageClass write permissions via RBAC” RHSA-2020:2479
  • Red Hat OpenShift Container Platform 4.2 openshift 4.2.36-202006211650.p0.git.0.1fe246f.el7, openshift 4.2.36-202006211650.p0.git.0.1fe246f.el8, openshift-hyperkube 4.2.36-202006211650.p0.git.0.1fe246f.el7, openshift-hyperkube 4.2.36-202006211650.p0.git.0.1fe246f.el8
    fixed: vendor fix “Restrict use of the vulnerable volume type and restrict StorageClass write permissions via RBAC” RHSA-2020:2594
  • Red Hat OpenShift Container Platform 4.3 openshift4/ose-hyperkube v4.3.25-202006081335, openshift 4.3.25-202006060952.git.1.96c30f6.el7, openshift 4.3.25-202006060952.git.1.96c30f6.el8, openshift-hyperkube 4.3.25-202006060952.git.1.96c30f6.el7, openshift-hyperkube 4.3.25-202006060952.git.1.96c30f6.el8
    fixed: vendor fix “Restrict use of the vulnerable volume type and restrict StorageClass write permissions via RBAC” RHSA-2020:2440
  • Red Hat OpenShift Container Platform 4.4 openshift4/ose-hyperkube v4.4.0-202006080610, openshift 4.4.0-202006061254.git.1.dc84fb4.el7, openshift 4.4.0-202006061254.git.1.dc84fb4.el8, openshift-hyperkube 4.4.0-202006061254.git.1.dc84fb4.el7, openshift-hyperkube 4.4.0-202006061254.git.1.dc84fb4.el8
    fixed: vendor fix “Restrict use of the vulnerable volume type and restrict StorageClass write permissions via RBAC” RHSA-2020:2448
  • Red Hat OpenShift Container Platform 4.5 openshift4/ose-cli v4.5.0-202007012112.p0, openshift4/ose-pod v4.5.0-202007012112.p0, openshift4/ose-etcd v4.5.0-202007012112.p0, openshift4/ose-tests v4.5.0-202007100518.p0, openshift4/ose-coredns v4.5.0-202007012112.p0, openshift4/ose-grafana v4.5.0-202007012112.p0, +71 more
    fixed: vendor fix “Restrict use of the vulnerable volume type and restrict StorageClass write permissions via RBAC” RHBA-2020:2409
  • Red Hat OpenShift Container Platform 4.6 openshift4/ose-pod v4.6.0-202010061132.p0, openshift4/ose-jenkins v4.6.0-202010120952.p0, openshift4/ose-deployer v4.6.0-202010080605.p0, openshift4/ose-sdn-rhel8 v4.6.0-202010061132.p0, openshift4/ose-telemeter v4.6.0-202010061132.p0, openshift4/ose-kube-proxy v4.6.0-202010061132.p0, +49 more
    fixed: vendor fix “Restrict use of the vulnerable volume type and restrict StorageClass write permissions via RBAC” RHBA-2020:4196
  • Red Hat Openshift Container Storage 4 ocs4/rook-ceph-rhel8-operator
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.68% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
NVD 3.1 6.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:P/I:N/A:N
GitHub 3.1 6.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
go k8s.io/kubernetes
>=1.18.0, <1.18.1
>=1.17.0, <1.17.4
>=1.16.0, <1.16.9
<1.15.12
1.18.1
1.17.4
1.16.9
1.15.12

Affected products

  • Kubernetes Kubernetes

Classification

Weakness
  • CWE-918 Server-Side Request Forgery
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.