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CVE-2025-66221

Werkzeug is a comprehensive WSGI web application library. Prior to version 3.1.4, Werkzeug's safe_join function allows path segments with Windows device names. On Windows, there are special device names such as CON, AUX, etc that are implicitly present and readable in every directory. send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3f4cefcf5960d4d280a644f830027a5a7a030185d265c92e448ac406daf57691
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"werkzeug","vendor":"pallets","versions":[{"status":"affected","version":"< 3.1.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0ec0a848181d69e9a5dd5dccb2861abb519386c1eb220aba7895d699a742b8e · sha256:ac9f08923a16996b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a0ec0a848181d69e9a5dd5dccb2861abb519386c1eb220aba7895d699a742b8e · sha256:ac9f08923a16996b… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-67","description":"CWE-67: Improper Handling of Windows Device Names","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a0ec0a848181d69e9a5dd5dccb2861abb519386c1eb220aba7895d699a742b8e · sha256:ac9f08923a16996b… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/pallets/werkzeug/commit/4b833376a45c323a189cd11d2362bcffdb1c0c13","tags":["x_refsource_MISC"],"url":"https://github.com/pallets/werkzeug/commit/4b833376a45c323a189cd11d2362bcffdb1c0c13"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0ec0a848181d69e9a5dd5dccb2861abb519386c1eb220aba7895d699a742b8e · sha256:ac9f08923a16996b… · /containers/cna/references/1
{"name":"https://github.com/pallets/werkzeug/releases/tag/3.1.4","tags":["x_refsource_MISC"],"url":"https://github.com/pallets/werkzeug/releases/tag/3.1.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0ec0a848181d69e9a5dd5dccb2861abb519386c1eb220aba7895d699a742b8e · sha256:ac9f08923a16996b… · /containers/cna/references/2
{"name":"https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2","tags":["x_refsource_CONFIRM"],"url":"https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0ec0a848181d69e9a5dd5dccb2861abb519386c1eb220aba7895d699a742b8e · sha256:ac9f08923a16996b… · /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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