Home/CVE/Kubernetes API server in all versions allow an attacker who is able to create a ClusterIP service and set the spec.exter
CVE
CVE-2020-855416
Kubernetes API server in all versions allow an attacker who is able to create a ClusterIP service and set the spec.exter
Kubernetes API server in all versions allow an attacker who is able to create a ClusterIP service and set the spec.externalIPs field, to intercept traffic to that IP address. Additionally, an attacker who is able to patch the status (which is considered a privileged operation and should not typically be granted to users) of a LoadBalancer service can set the status.loadBalancer.ingress.ip to similar effect.
MEDIUM · CVSS 6.3
EPSS 0.09274
EPSS exploitation odds9.27% · top 5%
Schedule remediation
- EPSS percentile: top 5% of all CVEs by exploitation likelihood
- Public exploit or PoC is available
Sigma rules8
YARA rules0
Look this up elsewhere - one-click external pivots
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How to read a CVE - triage first, then detect and patch
This page is every public fact about CVE-2020-8554, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.
Triage: should I act now? Four signals, and they are not interchangeable:
CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked.
EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal.
CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score.
Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.
How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.
Then what - two workflows:
Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits.
PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.
Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).
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Exploitation evidence
1 of 7 sources
Corroboration score 8/100 ·
emerging.
This counts how many independent sources have exploitation evidence, and separates two different things:
confirmed in-the-wild use (CISA KEV, Microsoft MSRC, ransomware activity) from
exploit / PoC availability (Metasploit, ExploitDB, Nuclei, public PoCs). A template or PoC existing means
an attack is possible and easy - it is not, on its own, proof the CVE is being exploited in the wild.
Exploit / PoC available
public PoC
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Exploitation momentum
496 days of EPSSstable
Exploitation pressure is steady. This reads the direction and speed of EPSS over time, which can move before EPSS itself peaks or before CISA lists it.
EPSS exploitation probability
9.27%
Top 5%odds of exploitation in the next 30 days
CVSS metric silhouette
shape grows toward worst-case
SSVC triage
No SSVC vulnrichment for this CVE. CISA's Vulnrichment program scores newer CVEs (~2024 onwards) plus selected older critical ones. Use the EPSS probability + KEV status to triage instead.
CVSS vector breakdown
Exploitability - how they get in
Attack Vector
Network
Adjacent
Local
Physical
Attack Complexity
Low
High
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Impact - what breaks
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
VECTOR
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:LLifecycle
- 21 Jan 2021Published to NVD
- 17 Jun 2026Last modified
Every entry is a recorded date - NVD publish/modify, CISA KEV add, public exploit disclosure. No inferred events.
Attack path
Full kill chain
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Public Exploits & PoCs
16These PoC and exploit links come from public sources and are not verified to be safe or functional. Review the code before running anything, and treat unverified entries as untrusted. Signed-in users mark whether it works, rate 1-10, and can report malware with a required reason that becomes a public comment.
Source
Works?
no reports yet
Rating
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ATT&CK techniques
1Techniques this CVE enables. Pills with a solid outline are high confidence - named directly in ATT&CK or Nuclei, or human-curated by CTID; the rest are inferred from the weakness type using MITRE's CVE Mapping Methodology and the CWE → CAPEC chain. Broad, generic-weakness guesses are filtered out. A small N× marks a technique that N independent sources agree on.
▤ Build a SIEM detection for these techniques⬡
Weakness Classification
CWE-283Unverified Ownership
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Affected Products & Versions
4▤
Affected Packages
1Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go
k8s.io/kubernetes
MODERATE
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Related CVEs
8CVEs linked to this one by a shared weakness (CWE) or affected product - joins on data already in the engine, with the reason shown per row.
CVE-2021-24500
Several AJAX actions available in the Workreap WordPress theme before 2.2.2 lack...
same CWE-283
HIGH
CVE-2021-24501
The Workreap WordPress theme before 2.2.2 had several AJAX actions missing autho...
same CWE-283
HIGH
CVE-2022-29220
github-action-merge-dependabot is an action that automatically approves and merg...
same CWE-283
MEDIUM
CVE-2023-30544
Kiwi TCMS is an open source test management system. In versions of Kiwi TCMS pri...
same CWE-283
LOW
CVE-2017-1002101
In Kubernetes versions 1.3.x, 1.4.x, 1.5.x, 1.6.x and prior to versions 1.7.14, ...
same product
HIGH
CVE-2017-1002102
In Kubernetes versions 1.3.x, 1.4.x, 1.5.x, 1.6.x and prior to versions 1.7.14, ...
same product
HIGH
CVE-2018-1002100
In Kubernetes versions 1.5.x, 1.6.x, 1.7.x, 1.8.x, and prior to version 1.9.6, t...
same product
MEDIUM
CVE-2018-1002101
In Kubernetes versions 1.9.0-1.9.9, 1.10.0-1.10.5, and 1.11.0-1.11.1, user input...
same product
MEDIUM
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Fixed versions by distribution
17The package version that resolves this CVE on each Linux distribution, from the vendor’s published security data. fixed in shows a patched version exists; open means the package is listed as affected with no fix yet.
oracle allkata fixed in 0:1.11.5-2.el8
oracle allkata-agent fixed in 0:1.11.5-1.el7
oracle allkata-image fixed in 0:1.11.5-1.1.ol7_202101151825
oracle allkata-ksm-throttler fixed in 0:1.11.5-1.el7
oracle allkata-proxy fixed in 0:1.11.5-1.el7
oracle allkata-runtime fixed in 0:1.11.5-1.el7
oracle allkata-shim open
oracle allkubeadm fixed in 0:1.18.10-3.el8
oracle allkubectl fixed in 0:1.18.10-3.el7
oracle allkubelet fixed in 0:1.18.10-3.el7
oracle allolcne-agent open
oracle allolcne-api-server open
oracle allolcne-istio-chart open
oracle allolcne-nginx open
oracle allolcne-prometheus-chart open
oracle allolcne-utils open
oracle allolcnectl open
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Sigma Hunt Rules
8Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
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Vendor Advisories
2msrcCVE-2020-8554
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References & Sources
9Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.