HOMEVULNERABILITIESCVE-2020-8558
HIGH

CVE-2020-8558

CWE-420Published: July 27, 2020· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

The Kubelet and kube-proxy components in versions 1.1.0-1.16.10, 1.17.0-1.17.6, and 1.18.0-1.18.3 were found to contain a security issue which allows adjacent hosts to reach TCP and UDP services bound to 127.0.0.1 running on the node or in the node's network namespace. Such a service is generally thought to be reachable only by other processes on the same host, but due to this defeect, could be reachable by other hosts on the same LAN as the node, or by containers running on the same node as the service.

NVD Source

Technical Analysis

CVE-2020-8558 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorAdjacent
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Kubernetes1 product(s)
kubernetes
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/kubernetes/kubernetes/issues/92315
PATCHhttps://github.com/kubernetes/kubernetes/issues/92315
ADVISORYhttps://groups.google.com/g/kubernetes-announce/c/sI4KmlH3S2I/m/TljjxOBvBQAJ
ADVISORYhttps://security.netapp.com/advisory/ntap-20200821-0001/
ADVISORYhttps://groups.google.com/g/kubernetes-announce/c/sI4KmlH3S2I/m/TljjxOBvBQAJ
ADVISORYhttps://security.netapp.com/advisory/ntap-20200821-0001/

All References (6)

→
https://github.com/kubernetes/kubernetes/issues/92315Exploit · Mitigation · Patch · Third Party Advisory
→
https://groups.google.com/g/kubernetes-announce/c/sI4KmlH3S2I/m/TljjxOBvBQAJExploit · Mailing List · Mitigation · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20200821-0001/Third Party Advisory
→
https://github.com/kubernetes/kubernetes/issues/92315Exploit · Mitigation · Patch · Third Party Advisory
→
https://groups.google.com/g/kubernetes-announce/c/sI4KmlH3S2I/m/TljjxOBvBQAJExploit · Mailing List · Mitigation · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20200821-0001/Third Party Advisory

Quick Facts

CVE IDCVE-2020-8558
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-420
CISA KEVNo
Affected1 vendor(s)
PublishedJul 27, 2020

Related CVEs (CWE-420)

CVE-2025-54351
10.0
CVE-2023-31241
10.0
CVE-2025-52921
9.9
CVE-2023-4570
8.8
CVE-2025-8557
8.8
CVE-2026-40217
8.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-8558 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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