CVE-2021-26236
7.8 · HIGHOverview
CVE-2021-26236 is a high-severity vulnerability affecting faststone image_viewer. It was published on March 18, 2021 and has a CVSS 3.1 base score of 7.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from faststone. Update image_viewer to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| faststone | image_viewer | 0 | Affected |
References
Frequently Asked Questions
What is CVE-2021-26236?
CVE-2021-26236 is a high-severity vulnerability affecting faststone image_viewer. It was published on March 18, 2021 and has a CVSS 3.1 base score of 7.8 (HIGH).
How severe is CVE-2021-26236?
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-26236?
Check the references section for vendor advisories and patches from faststone. Update image_viewer to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-26236?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-26236 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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