Buffer overflow in Faststone Image Viewer
CVE-2021-26236
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.020 (79.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- voidsec.com/fuzzing-faststone-image-viewer-cve-2021-26236 (Exploit, Third Party Advisory)
- www.exploit-db.com/exploits/49660 (Exploit, VDB Entry, Third Party Advisory)
- voidsec.com/advisories/cve-2021-26236-faststone-image-viewer-v-7-5-stack-based-… (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-26236?
- CVE-2021-26236 is a high-severity vulnerability in Faststone Image Viewer, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2021-03-18.
- How severe is CVE-2021-26236?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-26236 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.