CVE-2019-20395

Name: CVE-2019-20395
Creator: NVD / NIST
Published: 2020-01-22T22:15:10.423+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.84%

Last modified Jun 17, 2026

CVE-2019-20395 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 1.84% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

1.84%

76.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-674

Affected Software

Vendor	Product	Versions	Update
Cesnet	Libyang	0.11	R1
Cesnet	Libyang	0.12	R1
Cesnet	Libyang	0.13	R1
Cesnet	Libyang	0.14	R1
Cesnet	Libyang	0.15	R1
Cesnet	Libyang	0.16	R1

References

https://bugzilla.redhat.com/show_bug.cgi?id=1793924Issue Tracking, Third Party Advisory
https://github.com/CESNET/libyang/commit/4e610ccd87a2ba9413819777d508f71163fcc237Third Party Advisory
https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1Third Party Advisory
https://github.com/CESNET/libyang/issues/724Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html
https://bugzilla.redhat.com/show_bug.cgi?id=1793924Issue Tracking, Third Party Advisory
https://github.com/CESNET/libyang/commit/4e610ccd87a2ba9413819777d508f71163fcc237Third Party Advisory
https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1Third Party Advisory
https://github.com/CESNET/libyang/issues/724Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html

Timeline

Published: Jan 22, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-20395?

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.

How severe is CVE-2019-20395?

CVE-2019-20395 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.84% probability of exploitation in the next 30 days.

How do I fix CVE-2019-20395?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-20395?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST