Dnsdist
Monthly
Remote denial of service in dnsdist allows unauthenticated attackers to crash the DNS load balancer by sending specially crafted DNSCrypt queries that trigger a divide-by-zero error. The vulnerability requires no authentication, low attack complexity, and directly impacts service availability for all DNS traffic routed through affected dnsdist instances. Organizations using DNSCrypt protocol support in dnsdist face immediate risk of service disruption from remote attackers.
DNSdist instances using custom Lua code can be crashed via denial of service when the DNSQuestion:getEDNSOptions method accesses a modified DNS packet, triggering a use-after-free condition. This affects DNSdist across all versions and requires network access to send crafted DNS queries, but the attack demands specific Lua code patterns and high attack complexity; no public exploit or active exploitation has been confirmed, and the real-world impact is limited to environments where custom Lua DNS query handlers reference EDNS options.
DNSdist fails to validate packet size bounds when rewriting DNS questions or responses via Lua methods (DNSQuestion:changeName, DNSResponse:changeName), allowing unauthenticated remote attackers to craft DNS responses that trigger out-of-bounds writes and exceed the 65535-byte DNS packet size limit, resulting in denial of service via crash. CVSS 5.9 (high availability impact); no public exploit code identified at time of analysis.
Memory exhaustion in DNSdist allows remote, unauthenticated attackers to trigger denial of service by crafting malicious DNS over QUIC or DNS over HTTP/3 payloads that force excessive memory allocation. The attack causes the QUIC connection to close abnormally, and in systems with limited memory reserves, can force out-of-memory conditions that terminate the DNSdist process entirely.
Out-of-bounds read in PowerDNS dnsdist allows unauthenticated remote attackers to trigger denial of service or potential information disclosure by sending a crafted DNS response packet when custom Lua code uses the newDNSPacketOverlay function to parse packets. CVSS 5.3 indicates moderate severity with network-accessible attack surface and no privilege or user interaction required.
DNSdist is vulnerable to denial of service via out-of-bounds write when processing crafted UDP responses from a rogue backend server. An attacker controlling a backend DNS server can send a specially crafted UDP response with a query ID set off-by-one from the maximum configured value, triggering memory corruption that crashes the DNS forwarder. The CVSS score of 6.5 reflects network attack vector with high complexity and absence of confidentiality impact, though availability and integrity are affected.
dnsdist's Discovery of Designated Resolvers (DDR) upgrade mechanism allows a rogue backend to send a crafted SVCB response that causes a denial of service via availability impact when DDR is explicitly enabled through the autoUpgrade (Lua) or auto_upgrade (YAML) configuration options. The vulnerability requires adjacent network access and high complexity exploitation conditions, affecting only deployments that have manually enabled DDR functionality-a non-default configuration.
Out-of-bounds memory read in dnsdist allows remote attackers to trigger information disclosure or denial of service when custom Lua code invokes getDomainListByAddress() or getAddressListByDomain() functions on a crafted packet cache entry. The vulnerability requires network access but has high attack complexity, limiting real-world exploitation despite the remote attack vector.
Denial of service in dnsdist via crafted PRSD (PowerDNS Response Detection) queries causes assertion failure and service disruption on remote DNS resolvers. The vulnerability requires specific network conditions and crafted packet construction (AC:H) but affects default configurations without authentication. CVSS 3.7 reflects low availability impact with non-trivial exploitation complexity.
dnsdist can experience a denial-of-service condition through query-response mismatching when a client sends precisely timed floods of queries routed to TCP-only or DNS over TLS backends. An adjacent network attacker with high timing precision can cause limited availability impact by desynchronizing the query-response correlation on affected backends, though exploitation requires favorable network conditions and careful query timing. This issue carries a low CVSS score (3.1) reflecting the high attack complexity and adjacency requirement.
dnsdist allows remote denial-of-service attacks through memory exhaustion by generating numerous error responses on single DoQ (DNS-over-QUIC) and DoH3 (DNS-over-HTTPS/3) connections. An unauthenticated remote attacker can trigger excessive memory allocation by rapidly sending queries that produce error responses, with resources not properly released until connection termination. CVSS 5.3 (AV:N/AC:L/PR:N/UI:N) reflects network-accessible availability impact; no public exploit identified at time of analysis.
dnsdist can be forced into excessive memory allocation when a client generates high volumes of DNS queries routed to an overloaded DNS-over-HTTPS (DoH) backend, causing queries to accumulate in an unbounded buffer that persists until connection closure. This denial-of-service condition affects dnsdist deployments with DoH backends under load, allowing unauthenticated remote attackers to exhaust server memory with sustained query traffic.
DNSdist allows remote attackers to create unlimited concurrent DoQ (DNS over QUIC) or DoH3 (DNS over HTTPS/3) connections, triggering unbounded memory allocation and denial of service. The vulnerability affects configurations where these protocols are explicitly enabled, as both are disabled by default. No authentication is required for exploitation, and CVSS 5.3 (AC:L, AV:N) indicates straightforward network-based triggering under default conditions.
Denial of service in PowerDNS Authoritative, Recursor, and dnsdist via unbounded memory allocation in their internal web servers when processing specially crafted web requests. Multiple product lines are affected across several version ranges. The internal web server is disabled by default, significantly limiting real-world exposure. A vendor-released patch is available. CVSS 5.3 (low severity) with network-accessible vector but no authentication required reflects the ease of exploitation offset by the availability limitation and DoS-only impact.
Unlimited memory allocation in PowerDNS internal web server allows remote denial of service via crafted web requests. The vulnerability affects multiple PowerDNS products (dnsdist, Authoritative, and Recursor) across multiple versions, though the internal web server is disabled by default, significantly limiting real-world exposure. CVSS 5.3 reflects low attack complexity and no authentication requirements, but the default-disabled state and requirement to enable the internal web server substantially reduce practical risk.
PowerDNS dnsdist allows unauthenticated DNS over HTTPS (DoH) queries to bypass access control lists when the early_acl_drop option is disabled on nghttp2 frontends, exposing the DNS resolver to unauthorized query submission and potential information disclosure. Affected versions include dnsdist across multiple releases where this configuration weakness exists; the vulnerability has a CVSS score of 6.5 and exposes both confidentiality and integrity concerns despite not affecting availability.
Cross-Origin Resource Sharing (CORS) misconfiguration in PowerDNS dnsdist's internal webserver allows remote attackers to extract sensitive configuration information from the dashboard through a social engineering attack targeting authenticated administrators. An attacker can trick an admin into visiting a malicious website, which then leverages the misconfigured CORS policy to read dashboard API responses containing running configuration details. The vulnerability requires the internal webserver to be enabled (disabled by default) and user interaction, resulting in limited confidentiality impact with no integrity or availability risk.
HTML injection in DNSdist internal web dashboard allows remote unauthenticated attackers to inject malicious content via crafted DNS queries when domain-based dynamic rules are enabled, requiring user interaction to exploit. This affects all DNSdist versions with vulnerable rule functionality and carries low integrity impact with no confidentiality or availability consequences.
An issue has been found in PowerDNS DNSDist before 1.3.3 allowing a remote attacker to craft a DNS query with trailing data such that the addition of a record by dnsdist, for example an OPT record. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.
dnsdist version 1.1.0 is vulnerable to a flaw in authentication mechanism for REST API potentially allowing CSRF attack. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Improper Authentication vulnerability could allow attackers to bypass authentication mechanisms to gain unauthorized access.
Remote denial of service in dnsdist allows unauthenticated attackers to crash the DNS load balancer by sending specially crafted DNSCrypt queries that trigger a divide-by-zero error. The vulnerability requires no authentication, low attack complexity, and directly impacts service availability for all DNS traffic routed through affected dnsdist instances. Organizations using DNSCrypt protocol support in dnsdist face immediate risk of service disruption from remote attackers.
DNSdist instances using custom Lua code can be crashed via denial of service when the DNSQuestion:getEDNSOptions method accesses a modified DNS packet, triggering a use-after-free condition. This affects DNSdist across all versions and requires network access to send crafted DNS queries, but the attack demands specific Lua code patterns and high attack complexity; no public exploit or active exploitation has been confirmed, and the real-world impact is limited to environments where custom Lua DNS query handlers reference EDNS options.
DNSdist fails to validate packet size bounds when rewriting DNS questions or responses via Lua methods (DNSQuestion:changeName, DNSResponse:changeName), allowing unauthenticated remote attackers to craft DNS responses that trigger out-of-bounds writes and exceed the 65535-byte DNS packet size limit, resulting in denial of service via crash. CVSS 5.9 (high availability impact); no public exploit code identified at time of analysis.
Memory exhaustion in DNSdist allows remote, unauthenticated attackers to trigger denial of service by crafting malicious DNS over QUIC or DNS over HTTP/3 payloads that force excessive memory allocation. The attack causes the QUIC connection to close abnormally, and in systems with limited memory reserves, can force out-of-memory conditions that terminate the DNSdist process entirely.
Out-of-bounds read in PowerDNS dnsdist allows unauthenticated remote attackers to trigger denial of service or potential information disclosure by sending a crafted DNS response packet when custom Lua code uses the newDNSPacketOverlay function to parse packets. CVSS 5.3 indicates moderate severity with network-accessible attack surface and no privilege or user interaction required.
DNSdist is vulnerable to denial of service via out-of-bounds write when processing crafted UDP responses from a rogue backend server. An attacker controlling a backend DNS server can send a specially crafted UDP response with a query ID set off-by-one from the maximum configured value, triggering memory corruption that crashes the DNS forwarder. The CVSS score of 6.5 reflects network attack vector with high complexity and absence of confidentiality impact, though availability and integrity are affected.
dnsdist's Discovery of Designated Resolvers (DDR) upgrade mechanism allows a rogue backend to send a crafted SVCB response that causes a denial of service via availability impact when DDR is explicitly enabled through the autoUpgrade (Lua) or auto_upgrade (YAML) configuration options. The vulnerability requires adjacent network access and high complexity exploitation conditions, affecting only deployments that have manually enabled DDR functionality-a non-default configuration.
Out-of-bounds memory read in dnsdist allows remote attackers to trigger information disclosure or denial of service when custom Lua code invokes getDomainListByAddress() or getAddressListByDomain() functions on a crafted packet cache entry. The vulnerability requires network access but has high attack complexity, limiting real-world exploitation despite the remote attack vector.
Denial of service in dnsdist via crafted PRSD (PowerDNS Response Detection) queries causes assertion failure and service disruption on remote DNS resolvers. The vulnerability requires specific network conditions and crafted packet construction (AC:H) but affects default configurations without authentication. CVSS 3.7 reflects low availability impact with non-trivial exploitation complexity.
dnsdist can experience a denial-of-service condition through query-response mismatching when a client sends precisely timed floods of queries routed to TCP-only or DNS over TLS backends. An adjacent network attacker with high timing precision can cause limited availability impact by desynchronizing the query-response correlation on affected backends, though exploitation requires favorable network conditions and careful query timing. This issue carries a low CVSS score (3.1) reflecting the high attack complexity and adjacency requirement.
dnsdist allows remote denial-of-service attacks through memory exhaustion by generating numerous error responses on single DoQ (DNS-over-QUIC) and DoH3 (DNS-over-HTTPS/3) connections. An unauthenticated remote attacker can trigger excessive memory allocation by rapidly sending queries that produce error responses, with resources not properly released until connection termination. CVSS 5.3 (AV:N/AC:L/PR:N/UI:N) reflects network-accessible availability impact; no public exploit identified at time of analysis.
dnsdist can be forced into excessive memory allocation when a client generates high volumes of DNS queries routed to an overloaded DNS-over-HTTPS (DoH) backend, causing queries to accumulate in an unbounded buffer that persists until connection closure. This denial-of-service condition affects dnsdist deployments with DoH backends under load, allowing unauthenticated remote attackers to exhaust server memory with sustained query traffic.
DNSdist allows remote attackers to create unlimited concurrent DoQ (DNS over QUIC) or DoH3 (DNS over HTTPS/3) connections, triggering unbounded memory allocation and denial of service. The vulnerability affects configurations where these protocols are explicitly enabled, as both are disabled by default. No authentication is required for exploitation, and CVSS 5.3 (AC:L, AV:N) indicates straightforward network-based triggering under default conditions.
Denial of service in PowerDNS Authoritative, Recursor, and dnsdist via unbounded memory allocation in their internal web servers when processing specially crafted web requests. Multiple product lines are affected across several version ranges. The internal web server is disabled by default, significantly limiting real-world exposure. A vendor-released patch is available. CVSS 5.3 (low severity) with network-accessible vector but no authentication required reflects the ease of exploitation offset by the availability limitation and DoS-only impact.
Unlimited memory allocation in PowerDNS internal web server allows remote denial of service via crafted web requests. The vulnerability affects multiple PowerDNS products (dnsdist, Authoritative, and Recursor) across multiple versions, though the internal web server is disabled by default, significantly limiting real-world exposure. CVSS 5.3 reflects low attack complexity and no authentication requirements, but the default-disabled state and requirement to enable the internal web server substantially reduce practical risk.
PowerDNS dnsdist allows unauthenticated DNS over HTTPS (DoH) queries to bypass access control lists when the early_acl_drop option is disabled on nghttp2 frontends, exposing the DNS resolver to unauthorized query submission and potential information disclosure. Affected versions include dnsdist across multiple releases where this configuration weakness exists; the vulnerability has a CVSS score of 6.5 and exposes both confidentiality and integrity concerns despite not affecting availability.
Cross-Origin Resource Sharing (CORS) misconfiguration in PowerDNS dnsdist's internal webserver allows remote attackers to extract sensitive configuration information from the dashboard through a social engineering attack targeting authenticated administrators. An attacker can trick an admin into visiting a malicious website, which then leverages the misconfigured CORS policy to read dashboard API responses containing running configuration details. The vulnerability requires the internal webserver to be enabled (disabled by default) and user interaction, resulting in limited confidentiality impact with no integrity or availability risk.
HTML injection in DNSdist internal web dashboard allows remote unauthenticated attackers to inject malicious content via crafted DNS queries when domain-based dynamic rules are enabled, requiring user interaction to exploit. This affects all DNSdist versions with vulnerable rule functionality and carries low integrity impact with no confidentiality or availability consequences.
An issue has been found in PowerDNS DNSDist before 1.3.3 allowing a remote attacker to craft a DNS query with trailing data such that the addition of a record by dnsdist, for example an OPT record. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.
dnsdist version 1.1.0 is vulnerable to a flaw in authentication mechanism for REST API potentially allowing CSRF attack. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Improper Authentication vulnerability could allow attackers to bypass authentication mechanisms to gain unauthorized access.