{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/dnsdist/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":5.3,"id":"CVE-2026-33254"}],"_cs_exploited":false,"_cs_products":["DNSdist"],"_cs_severities":["medium"],"_cs_tags":["denial-of-service","dnsdist","vulnerability"],"_cs_type":"advisory","_cs_vendors":["PowerDNS"],"content_html":"\u003cp\u003eMultiple unspecified vulnerabilities exist within DNSdist, a high-performance, load-balancing DNS proxy. An attacker can exploit these vulnerabilities to conduct a denial-of-service (DoS) attack, rendering the DNSdist service unavailable. While the specifics of the vulnerabilities are not detailed in the source material, the potential impact on DNS resolution services within an organization is significant. The lack of detailed information necessitates a proactive approach to detection and mitigation, focusing on identifying anomalous activity indicative of DoS attempts targeting DNSdist.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a vulnerable DNSdist instance accessible over the network.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts malicious DNS queries or exploits other unspecified vulnerabilities in DNSdist.\u003c/li\u003e\n\u003cli\u003eThe attacker floods the DNSdist instance with a high volume of these malicious requests.\u003c/li\u003e\n\u003cli\u003eDNSdist attempts to process these malformed or overwhelming requests, consuming excessive resources.\u003c/li\u003e\n\u003cli\u003eThe CPU and memory utilization of the DNSdist server spikes, leading to performance degradation.\u003c/li\u003e\n\u003cli\u003eLegitimate DNS requests are delayed or dropped due to resource exhaustion.\u003c/li\u003e\n\u003cli\u003eThe DNSdist service becomes unresponsive, preventing clients from resolving domain names.\u003c/li\u003e\n\u003cli\u003eNetwork services reliant on DNS resolution experience outages or significant performance issues.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of these vulnerabilities results in a denial-of-service condition, preventing legitimate clients from resolving domain names. This can lead to widespread network outages, impacting critical business functions and user experience. The severity of the impact depends on the role of the affected DNSdist instance within the network infrastructure.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor network traffic for unusual patterns indicative of DoS attacks targeting DNSdist, such as a sudden surge in DNS queries from a single source (see rule: \u0026ldquo;Detect High Volume of DNS Queries to Single Host\u0026rdquo;).\u003c/li\u003e\n\u003cli\u003eImplement rate limiting on DNS queries to mitigate the impact of volumetric DoS attacks (refer to your DNSdist configuration).\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rules in this brief to your SIEM and tune for your environment.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-30T09:09:10Z","date_published":"2026-04-30T09:09:10Z","id":"/briefs/2024-01-dnsdist-dos/","summary":"Multiple vulnerabilities in DNSdist can be exploited by an attacker to perform a denial of service attack, impacting the availability of DNS services.","title":"DNSdist Multiple Vulnerabilities Leading to Denial of Service","url":"https://feed.craftedsignal.io/briefs/2024-01-dnsdist-dos/"}],"language":"en","title":"CraftedSignal Threat Feed — Dnsdist","version":"https://jsonfeed.org/version/1.1"}