CVE-2019-20395: cesnet libyang Uncontrolled Recursion
CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2019-20395DEBIAN-CVE-2019-20395
Published 22-01-2020Last modified 05-08-2024
Vulnerability summary
CVE-2019-20395 is a medium (CVSS 6.5) Uncontrolled Recursion vulnerability in cesnet libyang. EPSS estimates a 1.85% chance of exploitation in the next 30 days, higher than 78.8% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
1.85%
0%100%
Low · +0.02 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Advisory lineage
Upstream 0 · Downstream 2Timeline
- 22-01-2020PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
A stack consumption issue is present in libyang before v1.0-r1 due to the self-referential union type containing leafrefs. Applications that use libyang to parse untrusted input yang files may crash.
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:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
1.85%
Chance of exploitation in the next 30 days
Percentile
79%
Versus all other CVEs
30-day change
+0.02 pp
From 1.84% on 19-09-2026
19-09-202619-10-2026
EPSS score1.85%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundLibyang
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Cesnet1 product
- libyang0.11:r1 | 0.11:r2 | 0.12:r1 | 0.12:r2 | 0.13:r1 | 0.13:r2 | 0.14:r1 | 0.15:r1 | 0.16:r1 | 0.16:r2 | 0.16:r3
Debian1 product
- libyang< 1.0.176-1
Ubuntu1 product
- libyangAll versions (No fix recorded)
3 vendors · 3 products
