CVE-2021-26236

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

FastStone Image Viewer v.<= 7.5 is affected by a Stack-based Buffer Overflow at 0x005BDF49, affecting the CUR file parsing functionality (BITMAPINFOHEADER Structure, 'BitCount' file format field), that will end up corrupting the Structure Exception Handler (SEH). Attackers could exploit this issue to achieve code execution when a user opens or views a malformed/specially crafted CUR file.

FastStone Image Viewer versiones anteriores incluyendo a 7.5, está afectado por un desbordamiento del búfer en la región stack de la memoria en 0x005BDF49, que afecta la funcionalidad de análisis de archivos CUR (estructura BITMAPINFOHEADER, campo de formato de archivo "BitCoun"), que terminará corrompiendo el Structure Exception Handler (SEH) . Unos atacantes podrían explotar este problema para lograr una ejecución de código cuando un usuario abre o visualiza un archivo CUR malformado o especialmente diseñado

*Credits: N/A

Attack Vector

Local

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

2021-01-25 CVE Reserved
2021-03-18 CVE Published
2024-08-03 CVE Updated
2024-08-03 First Exploit
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-787: Out-of-bounds Write

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC
https://voidsec.com/advisories/cve-2021-26236-faststone-image-viewer-v-7-5-stack-based-buffer-overflow	2024-08-03
https://voidsec.com/fuzzing-faststone-image-viewer-cve-2021-26236	2024-08-03
https://www.exploit-db.com/exploits/49660	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
Faststone Search vendor "Faststone"		Image Viewer Search vendor "Faststone" for product "Image Viewer"				<= 7.5 Search vendor "Faststone" for product "Image Viewer" and version " <= 7.5"		-		Affected