{"id":"CVE-2020-37121","aliases":["DEBIAN-CVE-2020-37121","EUVD-2020-31020","GHSA-77vf-q3xf-37g8","UBUNTU-CVE-2020-37121"],"status":"published","title":"CODE::BLOCKS 16.01 - Buffer Overflow (SEH) UNICODE","description":"CODE::BLOCKS 16.01 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler with crafted Unicode characters. Attackers can create a malicious text file with 1982 bytes of buffer and shellcode to trigger remote code execution.","severity":{"version":"4.0","score":6.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00244,"percentile":0.15658,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-121"],"published":"2026-02-05T16:13:31Z","modified":"2026-10-28T20:15:29Z","affected":[{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"codeblocks","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["13.12-3.1build1","13.12+dfsg-4"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"codeblocks","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["16.01+dfsg-2.1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"codeblocks","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["16.01+dfsg-2.1","17.12+dfsg-1","17.12+dfsg-1build1","20.03-3"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"codeblocks","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20.03-3","20.03-3.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"codeblocks","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20.03+svn13046-0.1build1","20.03+svn13046-0.2","20.03+svn13046-0.3build1","20.03+svn13046-0.3build2"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"codeblocks","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20.03+svn13046-0.4","25.03+dfsg-2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"codeblocks","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["25.03+dfsg-2.1","25.03+dfsg-3"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"codeblocks","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["25.03+dfsg-2","25.03+dfsg-2.1"]}],"products":[{"vendor":"code::blocks","product":"code::blocks"}],"references":[{"url":"https://nutcrackerssecurity.github.io/posts/windows-exploit-dev-part-7/","tags":["exploit"]},{"url":"https://www.codeblocks.org/","tags":["product","report"]},{"url":"https://sourceforge.net/projects/codeblocks/","tags":["third-party-advisory","report"]},{"url":"https://www.vulncheck.com/advisories/codeblocks-buffer-overflow-seh-unicode","tags":["third-party-advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-37121"},{"url":"https://sourceforge.net/projects/codeblocks"},{"url":"https://www.codeblocks.org"},{"url":"https://www.exploit-db.com/exploits/48344","tags":["report"]},{"url":"https://nutcrackerssecurity.github.io/posts/windows-exploit-dev-part-7"},{"url":"https://github.com/advisories/GHSA-77vf-q3xf-37g8"},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-37121","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-37121","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-37121","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-37121","title":"CODE::BLOCKS 16.01 - Buffer Overflow (SEH) UNICODE","description":"CODE::BLOCKS 16.01 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler with crafted Unicode characters. Attackers can create a malicious text file with 1982 bytes of buffer and shellcode to trigger remote code execution.","status":"published","published":"2026-02-05T16:13:31.455Z","modified":"2026-08-06T21:10:52.75Z","cvss":[{"version":"4.0","score":6.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:35:47.22408Z"}],"euvd":[{"id":"EUVD-2020-31020","description":"CODE::BLOCKS 16.01 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler with crafted Unicode characters. Attackers can create a malicious text file with 1982 bytes of buffer and shellcode to trigger remote code execution.","status":"published","published":"2026-02-05T16:13:31Z","modified":"2026-08-06T21:10:52Z","cvss":[{"version":"4.0","score":6.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T18:02:07.757838Z"}],"ghsa":[{"id":"GHSA-77vf-q3xf-37g8","title":"CODE::BLOCKS 16.01 contains a buffer overflow vulnerability that allows attackers to execute...","description":"CODE::BLOCKS 16.01 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler with crafted Unicode characters. Attackers can create a malicious M3U playlist file with 536 bytes of buffer and shellcode to trigger remote code execution.","status":"published","published":"2026-02-05T18:30:31Z","modified":"2026-08-07T00:32:09Z","cvss":[{"version":"4.0","score":6.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T15:10:11.041675Z"}],"nvd":[{"id":"CVE-2020-37121","description":"CODE::BLOCKS 16.01 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler with crafted Unicode characters. Attackers can create a malicious text file with 1982 bytes of buffer and shellcode to trigger remote code execution.","status":"published","published":"2026-02-05T17:16:06.73Z","modified":"2026-08-06T22:16:36.453Z","cvss":[{"version":"4.0","score":6.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:06:48.591569Z"}],"osv":[{"id":"DEBIAN-CVE-2020-37121","description":"CODE::BLOCKS 16.01 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler with crafted Unicode characters. Attackers can create a malicious M3U playlist file with 536 bytes of buffer and shellcode to trigger remote code execution.","status":"withdrawn","published":"2026-02-05T17:16:06.73Z","modified":"2026-05-01T20:01:55.888866Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:34.019707Z"},{"id":"UBUNTU-CVE-2020-37121","description":"CODE::BLOCKS 16.01 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler with crafted Unicode characters. Attackers can create a malicious text file with 1982 bytes of buffer and shellcode to trigger remote code execution.","status":"published","published":"2026-02-05T17:16:00Z","modified":"2026-10-28T20:15:29.474311488Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"},{"version":"4.0","score":6.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T15:54:25.179924Z"}]}}