CVE-2019-20398

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A NULL pointer dereference is present in libyang before v1.0-r3 in the function lys_extension_instances_free() due to a copy of unresolved extensions in lys_restr_dup(). Applications that use libyang to parse untrusted input yang files may crash.

Una desreferencia del puntero NULL está presente en libyang versiones anteriores a v1.0-r3, en la función lys_extension_instances_free() debido a una copia de extensiones no resuelta en la función lys_restr_dup(). Las aplicaciones que usan libyang para analizar archivos de entrada yang no confiables pueden bloquearse.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

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
2023-09-20 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-476: NULL Pointer Dereference

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/773	2024-08-05

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=1793935	2023-09-19
https://github.com/CESNET/libyang/commit/7852b272ef77f8098c35deea6c6f09cb78176f08	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