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TI-2020-13719 Aliases CVE-2020-19861GHSA-fhv5-v23r-vj74

When a zone file in ldns 1.7.1 is parsed, the function ldns_nsec3_salt_data is too…

Priority LOW 36CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.01493 74th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nlnetlabs:ldns:1.7.1:*:*:*:*:*:*:*1.7.1VulnerableNLNETLABS
  • cpe:2.3:a:nlnetlabs:ldns:1.7.1:*:*:*:*:*:*:* Versions 1.7.1 Vulnerable ·NLNETLABS

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-19861
  2. 2026-10-03 Alias added: GHSA-fhv5-v23r-vj74

References

Exploit 1

Advisory 1

  • TI-2017-14547 A double-free vulnerability in parse.c in ldns 1.7.0 have unspecified impact and attack vectors. CVSS 3.0CRITICAL 9.8
  • TI-2017-14548 A double-free vulnerability in str2host.c in ldns 1.7.0 have unspecified impact and attack vectors. CVSS 3.0CRITICAL 9.8
  • TI-2011-03157 Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns before… CVSS 2.0MEDIUM 6.8
  • TI-2026-09311 Insufficient verification that responses belong to a query CVSS 4.0HIGH 8.2
  • TI-2009-01040 Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns 1.4.x… CVSS 2.0MEDIUM 6.4
  • TI-2020-13718 When ldns version 1.7.1 verifies a zone file, the ldns_rr_new_frm_str_internal function… CVSS 3.1MEDIUM 6.5
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences