{"id":"CVE-2023-35709","aliases":["EUVD-2023-39708","GHSA-53x2-4242-7xpf"],"status":"published","title":"Ashlar-Vellum Cobalt Heap-based Buffer Overflow Remote Code Execution Vulnerability","description":"Ashlar-Vellum Cobalt Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.\n\nThe specific flaw exists within the parsing of CO files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.\n. Was ZDI-CAN-19928.","severity":{"version":"3.0","score":7.8,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.00399,"percentile":0.34421,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-122"],"published":"2024-05-03T01:57:32Z","modified":"2026-06-17T06:05:02Z","products":[{"vendor":"ashlar","product":"cobalt"},{"vendor":"ashlar-vellum","product":"cobalt"},{"vendor":"ashlar_vellum","product":"cobalt"}],"references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-23-872/","tags":["x_research-advisory","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-35709"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-23-872"},{"url":"https://github.com/advisories/GHSA-53x2-4242-7xpf"}],"sources":{"cve":[{"id":"CVE-2023-35709","title":"Ashlar-Vellum Cobalt Heap-based Buffer Overflow Remote Code Execution Vulnerability","description":"Ashlar-Vellum Cobalt Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.\n\nThe specific flaw exists within the parsing of CO files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.\n. Was ZDI-CAN-19928.","status":"published","published":"2024-05-03T01:57:32.608Z","modified":"2024-09-18T18:28:47.176Z","cvss":[{"version":"3.0","score":7.8,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:35:33.462059Z"}],"euvd":[{"id":"EUVD-2023-39708","description":"Ashlar-Vellum Cobalt Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.\n\nThe specific flaw exists within the parsing of CO files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.\n. Was ZDI-CAN-19928.","status":"published","published":"2024-05-03T01:57:32Z","modified":"2024-09-18T18:28:47Z","cvss":[{"version":"3.0","score":7.8,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T00:28:20.565617Z"}],"ghsa":[{"id":"GHSA-53x2-4242-7xpf","title":"Ashlar-Vellum Cobalt Heap-based Buffer Overflow Remote Code Execution Vulnerability. This...","description":"Ashlar-Vellum Cobalt Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.\n\nThe specific flaw exists within the parsing of CO files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-19928.","status":"published","published":"2024-05-03T03:30:52Z","modified":"2024-05-03T03:31:21Z","cvss":[{"version":"3.0","score":7.8,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:57:17.729082Z"}],"nvd":[{"id":"CVE-2023-35709","description":"Ashlar-Vellum Cobalt Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.\n\nThe specific flaw exists within the parsing of CO files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.\n. Was ZDI-CAN-19928.","status":"published","published":"2024-05-03T02:15:32.923Z","modified":"2026-06-17T06:05:02.993Z","cvss":[{"version":"3.0","score":7.8,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:09:11.362739Z"}]}}