CVE-2026-47703

MEDIUM

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

Title source: cna
STIX 2.1

Description

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.

References (1)

Core 1
Core References

Scores

CVSS v3 5.3
EPSS 0.0014
EPSS Percentile 3.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-330 CWE-346
Status published
Products (4)
adguard/adguardhome < 0.107.75
AdguardTeam/AdGuardHome 0 - 0.107.75Go
AdguardTeam/AdGuardHome < 0.107.75
AdguardTeam/dnsproxy 0 - 0.81.3Go
Published Jul 15, 2026
Tracked Since Jul 15, 2026