AdguardTeam AdGuard Home up to 0.107.74 DoQ Forwarding Path dns_id/txid state issue

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.44

Summaryinfo

A vulnerability classified as critical has been found in AdguardTeam AdGuard Home up to 0.107.74. This affects an unknown part of the component DoQ Forwarding Path. This manipulation of the argument dns_id/txid causes state issue. This vulnerability is registered as CVE-2026-47703. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as critical was found in AdguardTeam AdGuard Home up to 0.107.74. Affected by this vulnerability is some unknown processing of the component DoQ Forwarding Path. The manipulation of the argument dns_id/txid with an unknown input leads to a state issue vulnerability. The CWE definition for the vulnerability is CWE-371. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE 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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-47703 since 05/19/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.107.75 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: State issue
CWE: CWE-371
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: AdGuard Home 0.107.75

Timelineinfo

05/19/2026 CVE reserved
07/15/2026 +57 days Advisory disclosed
07/15/2026 +0 days VulDB entry created
07/15/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-47703 (🔒)
GCVE (CVE): GCVE-0-2026-47703
GCVE (VulDB): GCVE-100-379315

Entryinfo

Created: 07/15/2026 18:39
Changes: 07/15/2026 18:39 (54)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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