High severity · published Jan 21, 2022
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
7.5
CVSS
1.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 74% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LD
Ldns · Nlnetlabs
1.7.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-19861
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-19861
Third Party Advisory
https://cwe.mitre.org/data/definitions/126.html
Exploit
https://github.com/NLnetLabs/ldns/issues/51
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