CVE-2021-28040

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in OSSEC 3.6.0. An uncontrolled recursion vulnerability in os_xml.c occurs when a large number of opening and closing XML tags is used. Because recursion is used in _ReadElem without restriction, an attacker can trigger a segmentation fault once unmapped memory is reached.

Se detectó un problema en OSSEC versión 3.6.0. Se presenta una vulnerabilidad de recursividad no controlada en el archivo os_xml.c cuando es usada una gran cantidad de etiquetas XML de apertura y cierre. Debido a que una recursividad es usada en _ReadElem sin restricción, un atacante puede desencadenar un fallo de segmentación una vez que es alcanzada la memoria no asignada

*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

2021-03-05 CVE Reserved
2021-03-05 CVE Published
2023-11-19 EPSS Updated
2024-08-03 CVE Updated
2024-08-03 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-674: Uncontrolled Recursion

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC
https://github.com/ossec/ossec-hids/issues/1953	2024-08-03

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Ossec Search vendor "Ossec"		Ossec Search vendor "Ossec" for product "Ossec"				3.6.0 Search vendor "Ossec" for product "Ossec" and version "3.6.0"		-		Affected