An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS option(s) that DNSdist did not filter.
An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS option(s) that DNSdist did not filter.
Why this VPI (explainable, experimental)
VPI breakdown
| Impact | 37.00 |
| Exploitation signal(No additional exploitation signal) | ×1.00 |
| VPI | 37.00 |
VPI formula vpi-v1