Out-of-bounds Read in Nlnetlabs Ldns
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.015 (73.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
- Nlnetlabs Ldns — versions 1.7.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/NLnetLabs/ldns/issues/51 (Exploit, Third Party Advisory, Issue Tracking)
- cwe.mitre.org/data/definitions/126.html (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-19861?
- CVE-2020-19861 is a high-severity vulnerability in Nlnetlabs Ldns, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2022-01-21.
- How severe is CVE-2020-19861?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-19861 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.