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7.5
HIGH CVSS 3.1
CVE-2021-28905
"Libyang Assertion Failure Bug"
Description

In function lys_node_free() in libyang <= v1.0.225, it asserts that the value of node->module can't be NULL. But in some cases, node->module can be null, which triggers a reachable assertion (CWE-617).

INFO

Published Date :

May 20, 2021, 7:15 p.m.

Last Modified :

Nov. 21, 2024, 6 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2021-28905 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Cesnet libyang
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 MEDIUM [email protected]
CVSS 3.1 HIGH [email protected]
Solution
Update libyang to resolve an assertion failure vulnerability that could lead to a crash.
  • Update the libyang packages to the latest version.
  • If necessary, rebuild applications that use libyang.
Public PoC/Exploit Available at Github

CVE-2021-28905 has a 2 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-28905.

URL Resource
https://github.com/CESNET/libyang/issues/1452 Exploit Issue Tracking Patch Third Party Advisory
https://security.gentoo.org/glsa/202107-54 Third Party Advisory
https://github.com/CESNET/libyang/issues/1452 Exploit Issue Tracking Patch Third Party Advisory
https://security.gentoo.org/glsa/202107-54 Third Party Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-28905 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-28905 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
xiangmou123/SolrScan

solr综合利用工具

Python

Updated: 1 month, 1 week ago
1 stars 0 fork 0 watcher
Born at : June 22, 2025, 6:27 a.m. This repo has been linked 9 different CVEs too.
Profile Photo
n0-traces/cve_monitor

Automatic monitor github cve using Github Actions

Python

Updated: 6 months ago
2 stars 55 fork 55 watcher
Born at : April 7, 2021, 11:16 a.m. This repo has been linked 1008 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-28905 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2021-28905 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://github.com/CESNET/libyang/issues/1452
    Added Reference https://security.gentoo.org/glsa/202107-54
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Modified Analysis by [email protected]

    Apr. 05, 2022

    Action Type Old Value New Value
    Changed Reference Type https://github.com/CESNET/libyang/issues/1452 Exploit, Issue Tracking, Third Party Advisory https://github.com/CESNET/libyang/issues/1452 Exploit, Issue Tracking, Patch, Third Party Advisory
    Changed Reference Type https://security.gentoo.org/glsa/202107-54 No Types Assigned https://security.gentoo.org/glsa/202107-54 Third Party Advisory
  • CVE Modified by [email protected]

    Jul. 24, 2021

    Action Type Old Value New Value
    Added Reference https://security.gentoo.org/glsa/202107-54 [No Types Assigned]
  • Initial Analysis by [email protected]

    May. 24, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://github.com/CESNET/libyang/issues/1452 No Types Assigned https://github.com/CESNET/libyang/issues/1452 Exploit, Issue Tracking, Third Party Advisory
    Added CWE NIST CWE-617
    Added CPE Configuration OR *cpe:2.3:a:cesnet:libyang:*:*:*:*:*:*:*:* versions up to (including) 1.0.225
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 7.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 5
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.13 }} 0.01%

score

0.33510

percentile