CVE-2021-28903

Gentoo Linux Security Advisory 202107-54

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A stack overflow in libyang <= v1.0.225 can cause a denial of service through function lyxml_parse_mem(). lyxml_parse_elem() function will be called recursively, which will consume stack space and lead to crash.

Un desbordamiento de pila en libyang versiones anteriores a v1.0.225 incluyéndola, puede causar una denegación de servicio por medio de la función lyxml_parse_mem(). La función lyxml_parse_elem() será llamada de forma recursiva, lo que consumirá espacio en la pila y conllevará a un bloqueo

An update that fixes four vulnerabilities is now available. This update for libyang fixes the following issues. Fixed missing check in read_yin_leaf that can lead to DoS Fixed missing check in ext_get_plugin that lead to DoS. Fixed stack overflow in lyxml_parse_mem. Fixed missing check in read_yin_container that can lead to DoS.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-03-19 CVE Reserved
2021-05-20 CVE Published
2024-08-03 CVE Updated
2024-08-03 First Exploit
2025-06-21 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-674: Uncontrolled Recursion

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://github.com/CESNET/libyang/issues/1453	2024-08-03

URL	Date	SRC

URL	Date	SRC
https://security.gentoo.org/glsa/202107-54	2022-04-05

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"				<= 1.0.225 Search vendor "Cesnet" for product "Libyang" and version " <= 1.0.225"		-		Affected