7.5

CVE-2020-19861: nlnetlabs ldns Out-of-bounds Read

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2020-19861DEBIAN-CVE-2020-19861
Published 21-01-2022Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-19861 is a high (CVSS 7.5) Out-of-bounds Read vulnerability in nlnetlabs ldns. EPSS estimates a 1.49% chance of exploitation in the next 30 days, higher than 73.7% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.49%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 6 · Related 5
DLA-2910-1OPENSUSE-SU-2022:0675-1OPENSUSE-SU-2024:11802-1SUSE-SU-2022:0675-1USN-5257-1USN-5257-2

Timeline

  1. 21-01-2022
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.49%

Chance of exploitation in the next 30 days

Percentile

74%

Versus all other CVEs

30-day change

0.00 pp

From 1.49% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.49%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Ldns

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • ldns< 1.8.1-1
Nlnetlabs1 product
Ubuntu1 product
  • ldns< 1.6.17-8ubuntu0.1+esm1 | < 1.7.0-3ubuntu4.1 | < 1.7.0-4.1ubuntu1+esm1 | < 1.7.1-2ubuntu4+esm1

3 vendors · 3 products

References

8 links