CVE-2021-26236
mediumpriority · track · 32EPSS 0.020 · 80 %ileEUUSEPSS · scored 2026-10-28
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–7.8
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- https://nvd.nist.gov/vuln/detail/CVE-2021-26236cnnvd
- https://voidsec.com/advisories/cve-2021-26236-faststone-image-viewer-v-7-5-stack-based-buffer-overflow/cnnvd
- https://voidsec.com/fuzzing-faststone-image-viewer-cve-2021-26236cnnvd
- https://www.exploit-db.com/exploits/49660cnnvd
- https://voidsec.com/advisories/cve-2021-26236-faststone-image-viewer-v-7-5-stack-based-buffer-overflow/enisa_euvd
- https://voidsec.com/fuzzing-faststone-image-viewer-cve-2021-26236enisa_euvd
- https://www.exploit-db.com/exploits/49660enisa_euvd
- https://voidsec.com/advisories/cve-2021-26236-faststone-image-viewer-v-7-5-stack-based-buffer-overflow/ExploitThird Party Advisorynvd
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