CVE-2020-8554 (GCVE-0-2020-8554)

Vulnerability from cvelistv5 – Published: 2021-01-21 17:09 – Updated: 2026-06-01 21:44
VLAI
Title
Kubernetes man in the middle using LoadBalancer or ExternalIPs
Summary
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.
Severity
6.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CWE
Assigner
kubernetes CNA under the mitre root
CNA scorecard – unranked: 5 records in the last 180 days, 10 needed details
References
Impacted products
Vendor Product Version CPE status
Kubernetes Kubernetes Affected: 0 , < * (semver)
guessed Create a notification for this product.
Date Public
2020-12-07 00:00
Credits
Etienne Champetier (@champtar) of Anevia
Show details on NVD website
To clipboard 

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            "value": "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."
          },
          {
            "lang": "es",
            "value": "El servidor de la API de Kubernetes en todas las versiones permite a un atacante que puede crear un servicio ClusterIP y establecer el campo spec.externalIPs, interceptar el tr\u00e1fico a esa direcci\u00f3n IP. Adicionalmente, un atacante que sea capaz de parchear el estado (que se considera una operaci\u00f3n privilegiada y no se debe t\u00edpicamente otorgar a los usuarios) de un servicio LoadBalancer puede configurar el status.loadBalancer.ingress.ip con un efecto similar"
          }
        ],
        "id": "CVE-2020-8554",
        "lastModified": "2026-06-01T23:16:13.740",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
              "cvssData": {
                "accessComplexity": "MEDIUM",
                "accessVector": "NETWORK",
                "authentication": "SINGLE",
                "availabilityImpact": "PARTIAL",
                "baseScore": 6.0,
                "confidentialityImpact": "PARTIAL",
                "integrityImpact": "PARTIAL",
                "vectorString": "AV:N/AC:M/Au:S/C:P/I:P/A:P",
                "version": "2.0"
              },
              "exploitabilityScore": 6.8,
              "impactScore": 6.4,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 6.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "LOW",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 3.4,
              "source": "jordan@liggitt.net",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 5.0,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "LOW",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
                "version": "3.1"
              },
              "exploitabilityScore": 1.6,
              "impactScore": 3.4,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2021-01-21T17:15:13.843",
        "references": [
          {
            "source": "jordan@liggitt.net",
            "tags": [
              "Exploit",
              "Third Party Advisory"
            ],
            "url": "https://github.com/kubernetes/kubernetes/issues/97076"
          },
          {
            "source": "jordan@liggitt.net",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "https://groups.google.com/g/kubernetes-security-announce/c/iZWsF9nbKE8"
          },
          {
            "source": "jordan@liggitt.net",
            "url": "https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/"
          },
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            "source": "jordan@liggitt.net",
            "url": "https://lists.apache.org/thread.html/r0c76b3d0be348f788cd947054141de0229af00c540564711e828fd40%40%3Ccommits.druid.apache.org%3E"
          },
          {
            "source": "jordan@liggitt.net",
            "url": "https://lists.apache.org/thread.html/r1975078e44d96f2a199aa90aa874b57a202eaf7f25f2fde6d1c44942%40%3Ccommits.druid.apache.org%3E"
          },
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            "source": "jordan@liggitt.net",
            "url": "https://lists.apache.org/thread.html/rcafa485d63550657f068775801aeb706b7a07140a8ebbdef822b3bb3%40%3Ccommits.druid.apache.org%3E"
          },
          {
            "source": "jordan@liggitt.net",
            "url": "https://lists.apache.org/thread.html/rdb223e1b82e3d7d8e4eaddce8dd1ab87252e3935cc41c859f49767b6%40%3Ccommits.druid.apache.org%3E"
          },
          {
            "source": "jordan@liggitt.net",
            "tags": [
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            ],
            "url": "https://www.oracle.com//security-alerts/cpujul2021.html"
          },
          {
            "source": "jordan@liggitt.net",
            "tags": [
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            "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
          },
          {
            "source": "jordan@liggitt.net",
            "tags": [
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              "Third Party Advisory"
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            "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
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            "url": "https://github.com/kubernetes/kubernetes/issues/97076"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
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          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
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          },
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          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.apache.org/thread.html/rdb223e1b82e3d7d8e4eaddce8dd1ab87252e3935cc41c859f49767b6%40%3Ccommits.druid.apache.org%3E"
          },
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          },
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          },
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            "tags": [
              "Patch",
              "Third Party Advisory"
            ],
            "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
          }
        ],
        "sourceIdentifier": "jordan@liggitt.net",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-283"
              }
            ],
            "source": "jordan@liggitt.net",
            "type": "Secondary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-01T23:25:37+00:00",
      "cve": "CVE-2020-8554",
      "id": "CVE-2020-8554",
      "initial_release_date": "2020-12-07T00:00:00+00:00",
      "product_status:fixed": "24",
      "product_status:known_not_affected": "68",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kubernetes: MITM using LoadBalancer or ExternalIPs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-8554.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2025-02-17T06:47:20Z",
      "cve": "CVE-2020-8554",
      "id": "CVE-2020-8554",
      "initial_release_date": "2023-02-15T04:01:15Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2020-8554",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-8554.json",
      "version": "5"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.