What’s Vulnerable › Vulnerabilities

CVE-2021-26236

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-03-18 · updated 2026-06-17
• Weakness: CWE-787

Description

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.

Affected products

• FastStone Image Viewer: through 7.5

References

• https://voidsec.com/advisories/cve-2021-26236-faststone-image-viewer-v-7-5-stack-based-buffer-overflow/
• https://voidsec.com/fuzzing-faststone-image-viewer-cve-2021-26236
• https://www.exploit-db.com/exploits/49660
• https://voidsec.com/advisories/cve-2021-26236-faststone-image-viewer-v-7-5-stack-based-buffer-overflow/
• https://voidsec.com/fuzzing-faststone-image-viewer-cve-2021-26236
• https://www.exploit-db.com/exploits/49660

Get alerted when CVE-2021-26236 or the next vulnerability affects your stack