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Vulnerability record · CVE-2020-19860 · published 21 January 2022

CVE-2020-19860: Nlnetlabs ldns out-of-bounds read vulnerability

Nlnetlabs · Ldns

When ldns version 1.7.1 verifies a zone file, the ldns_rr_new_frm_str_internal function has a heap out of bounds read vulnerability. An attacker can leak information on the heap by constructing a zone file payload.

6.5 CVSS 3.1 Medium EPSS 1.3% · top 30.5% CWE-125 · Out-of-bounds read
6.5CVSS 3.1 base score, v2 4.3
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

When ldns version 1.7.1 verifies a zone file, the ldns_rr_new_frm_str_internal function has a heap out of bounds read vulnerability. An attacker can leak information on the heap by constructing a zone file payload.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/NLnetLabs/ldns/commit/15d96206996bea969fbc918eb0a4a346f514b9f3 PatchThird Party Advisory
https://github.com/NLnetLabs/ldns/issues/50 ExploitIssue TrackingThird Party Advisory
https://github.com/NLnetLabs/ldns/commit/15d96206996bea969fbc918eb0a4a346f514b9f3 PatchThird Party Advisory
https://github.com/NLnetLabs/ldns/issues/50 ExploitIssue TrackingThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2017-1000231Nlnetlabs ldns double free vulnerabilityA double-free vulnerability in parse.c in ldns 1.7.0 have unspecified impact and attack vectors.EPSS 2.7%9.8CVE-2017-1000232Nlnetlabs ldns double free vulnerabilityA double-free vulnerability in str2host.c in ldns 1.7.0 have unspecified impact and attack vectors.EPSS 2.3%8.2CVE-2026-10846Nlnetlabs ldns origin validation error vulnerabilityNLnet Labs ldns 1.2.0 up to and including versions 1.9.0, when used in applications as (stub) resolver over UDP, lacks matching the query destination…EPSS 0.15%7.5CVE-2020-19861Nlnetlabs ldns out-of-bounds read vulnerabilityWhen 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…EPSS 1.5%6.8CVE-2011-3581Nlnetlabs ldns memory buffer overflow vulnerabilityHeap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns before 1.6.11 allows remote attackers to cause a denial of service (c…EPSS 4.1%6.4CVE-2009-1086Nlnetlabs ldns vulnerabilityHeap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns 1.4.x allows remote attackers to cause a denial of service (memory co…EPSS 3.5%2.1CVE-2014-3209Nlnetlabs ldns permissions and access controls vulnerabilityThe ldns-keygen tool in ldns 1.6.x uses the current umask to set the privileges of the private key, which might allow local users to obtain the priva…EPSS 0.38%8.8CVE-2026-11645Google Chrome V8 out-of-bounds read and write enables sandbox code executionGoogle Chrome before 149.0.7827.103 contains an out-of-bounds read and write in the V8 JavaScript engine. A crafted HTML page can trigger the memory …KEVEPSS 2.2%analysed

Source: NIST National Vulnerability Database (record CVE-2020-19860), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.