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    CVE-2023-26249

    Knot Resolver before 5.6.0 enables attackers to consume its resources, launching amplification attacks and potentially causing a denial of service. Specifically, a single client query may lead to a hundred TCP connection attempts if a DNS server closes connections without providing a response.

    Published:Feb 21, 2023
    Last Modified:Mar 14, 2025
    EPS:Feb 21, 2023
    EPSS Score:0.00218
    CVSS Score:7.5

    Affected Products

    Vendor
    Nic
    Product
    Knot Resolver

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-66374 (CVSS 8.1) — Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-…
    CVE-2023-50387 (CVSS 7.5) — Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote atta…
    CVE-2023-46317 (CVSS 7.5) — Knot Resolver before 5.7.0 performs many TCP reconnections upon receiving certain nonsensical responses from s…
    CVE-2022-40188 (CVSS 7.5) — Knot Resolver before 5.5.3 allows remote attackers to cause a denial of service (CPU consumption) because of a…
    CVE-2022-32983 (CVSS 5.3) — Knot Resolver through 5.5.1 may allow DNS cache poisoning when there is an attempt to limit forwarding actions…
    CVE-2021-40083 (CVSS 7.5) — Knot Resolver before 5.3.2 is prone to an assertion failure, triggerable by a remote attacker in an edge case …
    CVE-2018-1110 (CVSS 7.5) — A flaw was found in knot-resolver before version 2.3.0. Malformed DNS messages may cause denial of service.…
    CVE-2020-12667 (CVSS 7.5) — Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled s…
    CVE-2019-19331 (CVSS 7.5) — knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replie…
    CVE-2019-10191 (CVSS 7.5) — A vulnerability was discovered in DNS resolver of knot resolver before version 4.1.0 which allows remote attac…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High