CVE-2019-20394

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A double-free is present in libyang before v1.0-r3 in the function yyparse() when a type statement in used in a notification statement. 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.

Una doble liberación está presente en libyang versiones anteriores a v1.0-r3, en la función yyparse() cuando se usa una sentencia type dentro de una sentencia notification. Las aplicaciones que usan libyang para analizar archivos de entrada yang no confiables pueden ser vulnerables a este fallo, lo que podría causar un bloqueo o potencialmente una ejecución de código.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-01-22 CVE Reserved
2020-01-22 CVE Published
2024-08-05 CVE Updated
2024-08-05 First Exploit
2024-09-06 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-415: Double Free

CAPEC

References (5)

URL	Tag	Source
https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html	Mailing List

URL	Date	SRC
https://github.com/CESNET/libyang/issues/769	2024-08-05

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=1793932	2023-09-19
https://github.com/CESNET/libyang/commit/6cc51b1757dfbb7cff92de074ada65e8523289a6	2023-09-19

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cesnet Search vendor "Cesnet"		Libyang Search vendor "Cesnet" for product "Libyang"				0.11 Search vendor "Cesnet" for product "Libyang" and version "0.11"		r1		Affected
Cesnet Search vendor "Cesnet"		Libyang Search vendor "Cesnet" for product "Libyang"				0.11 Search vendor "Cesnet" for product "Libyang" and version "0.11"		r2		Affected
Cesnet Search vendor "Cesnet"		Libyang Search vendor "Cesnet" for product "Libyang"				0.12 Search vendor "Cesnet" for product "Libyang" and version "0.12"		r1		Affected
Cesnet Search vendor "Cesnet"		Libyang Search vendor "Cesnet" for product "Libyang"				0.12 Search vendor "Cesnet" for product "Libyang" and version "0.12"		r2		Affected
Cesnet Search vendor "Cesnet"		Libyang Search vendor "Cesnet" for product "Libyang"				0.13 Search vendor "Cesnet" for product "Libyang" and version "0.13"		r1		Affected
Cesnet Search vendor "Cesnet"		Libyang Search vendor "Cesnet" for product "Libyang"				0.13 Search vendor "Cesnet" for product "Libyang" and version "0.13"		r2		Affected
Cesnet Search vendor "Cesnet"		Libyang Search vendor "Cesnet" for product "Libyang"				0.14 Search vendor "Cesnet" for product "Libyang" and version "0.14"		r1		Affected
Cesnet Search vendor "Cesnet"		Libyang Search vendor "Cesnet" for product "Libyang"				0.15 Search vendor "Cesnet" for product "Libyang" and version "0.15"		r1		Affected
Cesnet Search vendor "Cesnet"		Libyang Search vendor "Cesnet" for product "Libyang"				0.16 Search vendor "Cesnet" for product "Libyang" and version "0.16"		r1		Affected
Cesnet Search vendor "Cesnet"		Libyang Search vendor "Cesnet" for product "Libyang"				0.16 Search vendor "Cesnet" for product "Libyang" and version "0.16"		r2		Affected
Cesnet Search vendor "Cesnet"		Libyang Search vendor "Cesnet" for product "Libyang"				0.16 Search vendor "Cesnet" for product "Libyang" and version "0.16"		r3		Affected
Cesnet Search vendor "Cesnet"		Libyang Search vendor "Cesnet" for product "Libyang"				1.0 Search vendor "Cesnet" for product "Libyang" and version "1.0"		r1		Affected
Cesnet Search vendor "Cesnet"		Libyang Search vendor "Cesnet" for product "Libyang"				1.0 Search vendor "Cesnet" for product "Libyang" and version "1.0"		r2		Affected