CVE-2020-19860: nlnetlabs ldns Out-of-bounds Read
CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2020-19860DEBIAN-CVE-2020-19860
Published 21-01-2022Last modified 04-08-2024
Vulnerability summary
CVE-2020-19860 is a medium (CVSS 6.5) Out-of-bounds Read vulnerability in nlnetlabs ldns. EPSS estimates a 1.31% chance of exploitation in the next 30 days, higher than 70.2% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
1.31%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Advisory lineage
Upstream 0 · Downstream 6 · Related 5Timeline
- 21-01-2022PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
When ldns version 1.7.1 verifies a zone file, the ldns_rr_new_frm_str_internal function has a heap out of bounds read vulnerability. An attacker can leak information on the heap by constructing a zone file payload.
CVSS metrics
4 scores · 3 sources · 2 versionsMedium 6.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
1.31%
Chance of exploitation in the next 30 days
Percentile
70%
Versus all other CVEs
30-day change
0.00 pp
From 1.31% on 19-09-2026
19-09-202619-10-2026
EPSS score1.31%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundLdns
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Debian1 product
- ldns< 1.8.1-1
Nlnetlabs1 product
- ldns1.7.1
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- github.com/NLnetLabs/ldns/commit/15d96206996bea969fbc918eb0a4a346f514b9f3X Refsource MISCREPORTPatchThird Party Advisory
