CVE-2026-47703CWE-330CWE-346

AdGuard Home: DoQ-to-UDP State Reduction and Source-Port Oracle

Medium · published July 15, 2026

CVSS v4.0
6.3
EPSS
0%
Percentile
3.3
In the wild
Unconfirmed
What it is

AdGuard Home is a network-wide software for blocking ads and tracking. Prior to 0.107.75, AdGuard Home's client-triggered DoQ forwarding path to a udp:// upstream reduced backend UDP DNS state by producing dns_id=0 or txid=0 and exposed a quoted-port ICMP source-port oracle, weakening DNS response matching for forwarded queries. This issue is fixed in version 0.107.75.

The record
Technical detail
CVSS v4.0
6.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00143 · 3.3th percentile
Weaknesses
CWE-330 · Use of Insufficiently Random Values; CWE-346 · Origin Validation Error
Published
2026-07-15T16:03Z
EPSS history
Timeline
  • 15 JUL 16:03Z
    AdGuard Home: DoQ-to-UDP State Reduction and Source-Port Oracle
    cvelistv5