{"id":"CVE-2021-26235","aliases":["EUVD-2021-13052","GHSA-rg77-9f4c-3658"],"status":"published","title":"FastStone Image Viewer \u003c= 7.5 is affected by a user mode write access violation near NULL at...","description":"FastStone Image Viewer \u003c= 7.5 is affected by a user mode write access violation near NULL at 0x005bdfc9, triggered when a user opens or views a malformed CUR file that is mishandled by FSViewer.exe. Attackers could exploit this issue for a Denial of Service (DoS) or possibly to achieve code execution.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.01065,"percentile":0.65155,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-476"],"published":"2021-03-18T13:56:33Z","modified":"2026-06-17T03:42:59Z","products":[{"vendor":"faststone","product":"image_viewer"}],"references":[{"url":"https://voidsec.com/advisories/cve-2021-26235-faststone-image-viewer-v-7-5-user-mode-write-access-violation/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26235"},{"url":"https://github.com/advisories/GHSA-rg77-9f4c-3658"}],"sources":{"cve":[{"id":"CVE-2021-26235","description":"FastStone Image Viewer \u003c= 7.5 is affected by a user mode write access violation near NULL at 0x005bdfc9, triggered when a user opens or views a malformed CUR file that is mishandled by FSViewer.exe. Attackers could exploit this issue for a Denial of Service (DoS) or possibly to achieve code execution.","status":"published","published":"2021-03-18T13:56:33Z","modified":"2024-08-03T20:19:20.122Z","updated_at":"2026-11-02T14:32:57.368269Z"}],"euvd":[{"id":"EUVD-2021-13052","description":"FastStone Image Viewer \u003c= 7.5 is affected by a user mode write access violation near NULL at 0x005bdfc9, triggered when a user opens or views a malformed CUR file that is mishandled by FSViewer.exe. Attackers could exploit this issue for a Denial of Service (DoS) or possibly to achieve code execution.","status":"published","published":"2021-03-18T13:56:33Z","modified":"2024-08-03T20:19:20Z","updated_at":"2026-11-03T03:24:51.962182Z"}],"ghsa":[{"id":"GHSA-rg77-9f4c-3658","title":"FastStone Image Viewer \u003c= 7.5 is affected by a user mode write access violation near NULL at...","description":"FastStone Image Viewer \u003c= 7.5 is affected by a user mode write access violation near NULL at 0x005bdfc9, triggered when a user opens or views a malformed CUR file that is mishandled by FSViewer.exe. Attackers could exploit this issue for a Denial of Service (DoS) or possibly to achieve code execution.","status":"published","published":"2022-05-24T17:44:52Z","modified":"2023-01-29T05:05:43Z","cwes":["CWE-476"],"updated_at":"2026-11-02T14:45:51.862752Z"}],"nvd":[{"id":"CVE-2021-26235","description":"FastStone Image Viewer \u003c= 7.5 is affected by a user mode write access violation near NULL at 0x005bdfc9, triggered when a user opens or views a malformed CUR file that is mishandled by FSViewer.exe. Attackers could exploit this issue for a Denial of Service (DoS) or possibly to achieve code execution.","status":"published","published":"2021-03-18T14:15:13.803Z","modified":"2026-06-17T03:42:59.71Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:06:50.805771Z"}]}}