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CVE-2025-66491

Traefik is an HTTP reverse proxy and load balancer. Versions 3.5.0 through 3.6.2 have inverted TLS verification logic in the nginx.ingress.kubernetes.io/proxy-ssl-verify annotation. Setting the annotation to "on" (intending to enable backend TLS certificate verification) actually disables verification, allowing man-in-the-middle attacks against HTTPS backends when operators believe they are protected. This issue is fixed in version 3.6.3.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:95908281d131287c4079c5c0487180fde4588c9e3922445ff423224f1979b841
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"traefik","vendor":"traefik","versions":[{"status":"affected","version":">= 3.5.0, < 3.6.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:35367d9a1bc5d2757c1c1ea99935fffe4b8de1b87681c0381798e8b4e7aceeda · sha256:bddbc5bd5d229ef8… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:35367d9a1bc5d2757c1c1ea99935fffe4b8de1b87681c0381798e8b4e7aceeda · sha256:bddbc5bd5d229ef8… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-295","description":"CWE-295: Improper Certificate Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:35367d9a1bc5d2757c1c1ea99935fffe4b8de1b87681c0381798e8b4e7aceeda · sha256:bddbc5bd5d229ef8… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/traefik/traefik/commit/14a1aedf5704673d875d210d7bacf103a43c77e4","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/commit/14a1aedf5704673d875d210d7bacf103a43c77e4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:35367d9a1bc5d2757c1c1ea99935fffe4b8de1b87681c0381798e8b4e7aceeda · sha256:bddbc5bd5d229ef8… · /containers/cna/references/1
{"name":"https://github.com/traefik/traefik/releases/tag/v3.6.3","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/releases/tag/v3.6.3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:35367d9a1bc5d2757c1c1ea99935fffe4b8de1b87681c0381798e8b4e7aceeda · sha256:bddbc5bd5d229ef8… · /containers/cna/references/2
{"name":"https://github.com/traefik/traefik/security/advisories/GHSA-7vww-mvcr-x6vj","tags":["x_refsource_CONFIRM"],"url":"https://github.com/traefik/traefik/security/advisories/GHSA-7vww-mvcr-x6vj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:35367d9a1bc5d2757c1c1ea99935fffe4b8de1b87681c0381798e8b4e7aceeda · sha256:bddbc5bd5d229ef8… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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