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    CVE-2020-19861

    When a zone file in ldns 1.7.1 is parsed, the function ldns_nsec3_salt_data is too trusted for the length value obtained from the zone file. When the memcpy is copied, the 0xfe - ldns_rdf_size(salt_rdf) byte data can be copied, causing heap overflow information leakage.

    Published:Sep 26, 2021
    Last Modified:Nov 21, 2024
    EPS:Jan 21, 2022
    EPSS Score:0.00154
    CVSS Score:7.5

    Affected Products

    Vendor
    Nlnetlabs
    Product
    Ldns

    Exploits

    https://github.com/NLnetLabs/ldns/issues/51https://github.com/NLnetLabs/ldns/issues/51

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-10846 (CVSS 8.2) — NLnet Labs ldns 1.2.0 up to and including versions 1.9.0, when used in applications as (stub) resolver over UD…
    CVE-2020-19860 (CVSS 6.5) — When ldns version 1.7.1 verifies a zone file, the ldns_rr_new_frm_str_internal function has a heap out of boun…
    CVE-2017-1000232 (CVSS 9.8) — A double-free vulnerability in str2host.c in ldns 1.7.0 have unspecified impact and attack vectors.…
    CVE-2017-1000231 (CVSS 9.8) — A double-free vulnerability in parse.c in ldns 1.7.0 have unspecified impact and attack vectors.…
    CVE-2014-3209 (CVSS 2.1) — The ldns-keygen tool in ldns 1.6.x uses the current umask to set the privileges of the private key, which migh…
    CVE-2011-3581 (CVSS 6.8) — Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns before 1.6.11 allows remote at…
    CVE-2009-1086 (CVSS 6.4) — Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns 1.4.x allows remote attackers …

    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