CVE-2019-20397

Name: CVE-2019-20397
Creator: NVD / NIST
Published: 2020-01-22T22:15:10.55+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.49%

Last modified Jun 17, 2026

CVE-2019-20397 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A double-free is present in libyang before v1.0-r1 in the function yyparse() when an organization field is not terminated. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw, which would cause a crash or potentially code execution.. EPSS estimates a 2.49% chance of exploitation in the next 30 days.

Description

A double-free is present in libyang before v1.0-r1 in the function yyparse() when an organization field is not terminated. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw, which would cause a crash or potentially code execution.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

2.49%

82.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-415

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=1793928Issue Tracking, Patch, Third Party Advisory
https://github.com/CESNET/libyang/commit/88bd6c548ba79bce176cd875e9b56e7e0ef4d8d4Patch, Third Party Advisory
https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1Third Party Advisory
https://github.com/CESNET/libyang/issues/739Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html
https://bugzilla.redhat.com/show_bug.cgi?id=1793928Issue Tracking, Patch, Third Party Advisory
https://github.com/CESNET/libyang/commit/88bd6c548ba79bce176cd875e9b56e7e0ef4d8d4Patch, Third Party Advisory
https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1Third Party Advisory
https://github.com/CESNET/libyang/issues/739Third 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-2019-20397?

How severe is CVE-2019-20397?

CVE-2019-20397 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.49% probability of exploitation in the next 30 days.

How do I fix CVE-2019-20397?

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-2019-20397?

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

Scan your code now

Source: NVD / NIST