CVE-2021-26236

Public Exploit

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.

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.00% Top 25%
Third-Party Advisory voidsec.com Third-Party Advisory voidsec.com Third-Party Advisory exploit-db.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://voidsec.com/fuzzing-faststone-image-viewer-cve-2021-26236 third party advisory exploit
https://www.exploit-db.com/exploits/49660 third party advisory vdb entry exploit
https://voidsec.com/advisories/cve-2021-26236-faststone-image-viewer-v-7-5-stack-based-buffer-overflow/ third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2021-26236?
CVE-2021-26236 has been scored as a high severity vulnerability.
How to fix CVE-2021-26236?
To fix CVE-2021-26236, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-26236 being actively exploited in the wild?
It is possible that CVE-2021-26236 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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