Adguard vulnerabilities

9 vulnerabilities

Known vulnerabilities in Adguard products, newest first, with CVSS severity, EPSS, KEV listings and ransomware use, across 6 products.

Products

6
RoutineCVE-2026-47703adguardteam · adguardhome +3 moreAdGuard Home: DoQ-to-UDP State Reduction and Source-Port OracleAdGuard 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.CVSS6.3MediumEPSS0.14%PrioritiseCVE-2026-32136adguardteam · adguardhome +2 moreAdGuard Home: HTTP/2 Cleartext (h2c) Upgrade Authentication BypassAdGuard Home is a network-wide software for blocking ads and tracking. Prior to 0.107.73, an unauthenticated remote attacker can bypass all authentication in AdGuardHome by sending an HTTP/1.1 request that requests an upgrade to HTTP/2 cleartext (h2c). Once the upgrade is accepted, the resulting HTTP/2 connection is handled by the inner mux, which has no authentication middleware attached. All subsequent HTTP/2 requests on that connection are processed as fully authenticated, regardless of whether any credentials were provided. This vulnerability is fixed in 0.107.73.CVSS9.8CriticalEPSS0.77%PrioritiseCVE-2026-24902trusttunnel +1 moreTrustTunnel has SSRF and private network restriction bypass via numeric address destinationsTrustTunnel is an open-source VPN protocol with a server-side request forgery and and private network restriction bypass in versions prior to 0.9.114. In `tcp_forwarder.rs`, SSRF protection for `allow_private_network_connections = false` was only applied in the `TcpDestination::HostName(peer)` path. The `TcpDestination::Address(peer) => peer` path proceeded to `TcpStream::connect()` without equivalent checks (for example `is_global_ip`, `is_loopback`), allowing loopback/private targets to be reached by supplying a numeric IP. The vulnerability is fixed in version 0.9.114.CVSS7.1HighEPSS0.27%RoutineCVE-2026-24904trusttunnel +1 moreTrustTunnel has `client_random_prefix` rule bypass via fragmented or partial TLS ClientHelloTrustTunnel is an open-source VPN protocol with a rule bypass issue in versions prior to 0.9.115. In `tls_listener.rs`, `TlsListener::listen()` peeks 1024 bytes and calls `extract_client_random(...)`. If `parse_tls_plaintext` fails (for example, a fragmented/partial ClientHello split across TCP writes), `extract_client_random` returns `None`. In `rules.rs`, `RulesEngine::evaluate` only evaluates `client_random_prefix` when `client_random` is `Some(...)`. As a result, when extraction fails (`client_random == None`), any rule that relies on `client_random_prefix` matching is skipped and evaluation falls through to later rules. As an important semantics note: `client_random_prefix` is a match condition only. It does not mean "block non-matching prefixes" by itself. A rule with `client_random_prefix = ...` triggers its `action` only when the prefix matches (and the field is available to evaluate). Non-matches (or `None`) simply do not match that rule and continue to fall through. The vulnerability is fixed in version 0.9.115.CVSS5.3MediumEPSS0.30%RoutineCVE-2025-51497adguard · adguard_for_safariadguard adguard_for_safariAn issue was discovered in AdGuard plugin before 1.11.22 for Safari on MacOS. AdGaurd verbosely logged each url that Safari accessed when the plugin was active. These logs went into the MacOS general logs for any unsandboxed process to read. This may be disabled in version 1.11.22.CVSS5.5MediumEPSS0.16%PrioritiseCVE-2023-41173adguard · adguard_dnsadguard adguard_dnsAdGuard DNS before 2.2 allows remote attackers to cause a denial of service via malformed UDP packets.CVSS7.5HighEPSS0.81%RoutineCVE-2022-45770adguardadguard adguardImproper input validation in adgnetworkwfpdrv.sys in Adguard For Windows x86 through 7.11 allows local privilege escalation.CVSS7.8HighEPSS0.61%RoutineCVE-2022-32175adguardhome +2 moreAdGuardHome - CSRFIn AdGuardHome, versions v0.95 through v0.108.0-b.13 are vulnerable to Cross-Site Request Forgery (CSRF), in the custom filtering rules functionality. An attacker can persuade an authorized user to follow a malicious link, resulting in deleting/modifying the custom filtering rules.CVSS5.4MediumEPSS0.34%PrioritiseCVE-2021-27935adguard · adguard_homeadguard adguard_homeAn issue was discovered in AdGuard before 0.105.2. An attacker able to get the user's cookie is able to bruteforce their password offline, because the hash of the password is stored in the cookie.CVSS7.5HighEPSS4.97%