What’s Vulnerable › Vulnerabilities

CVE-2020-19861

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-01-21 · updated 2026-06-17
• Weakness: CWE-125

Description

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.

Affected products

• NLnet Labs ldns: 1.7.1

References

• https://cwe.mitre.org/data/definitions/126.html
• https://github.com/NLnetLabs/ldns/issues/51
• https://cwe.mitre.org/data/definitions/126.html
• https://github.com/NLnetLabs/ldns/issues/51

Get alerted when CVE-2020-19861 or the next vulnerability affects your stack