{"id":"CVE-2020-22552","state":"PUBLISHED","title":"The Snap7 server component in version 1.4.1, when an attacker sends a crafted packet with COTP protocol the last-data-unit flag set to No and S7 writes a var function, the Snap7 se","description":"The Snap7 server component in version 1.4.1, when an attacker sends a crafted packet with COTP protocol the last-data-unit flag set to No and S7 writes a var function, the Snap7 server will be crashed.","publishedAt":"2020-10-28T13:51:44.000Z","updatedAt":"2026-07-09T00:10:37.459Z","severity":null,"assigner":"mitre","products":["n/a n/a"],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":["https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/","https://sourceforge.net/projects/snap7/"],"weaknesses":[],"ingestedAt":"2026-10-29T19:46:58.002Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2020/22xxx/CVE-2020-22552.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2020-22552","state":"PUBLISHED","datePublished":"2020-10-28T13:51:44.000Z","dateUpdated":"2026-07-09T00:10:37.459Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2020-08-13T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"The Snap7 server component in version 1.4.1, when an attacker sends a crafted packet with COTP protocol the last-data-unit flag set to No and S7 writes a var function, the Snap7 server will be crashed."}],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":[{"url":"https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/"},{"url":"https://sourceforge.net/projects/snap7/"}],"problemTypes":[{"descriptions":[{"description":"n/a","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"mitre","dateUpdated":"2026-07-04T23:32:30.356Z","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2020-22552","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"The Snap7 server component in version 1.4.1, when an attacker sends a crafted packet with COTP protocol the last-data-unit flag set to No and S7 writes a var function, the Snap7 server will be crashed."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"name":"http://snap7.com","refsource":"MISC","url":"http://snap7.com"},{"name":"https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/","refsource":"MISC","url":"https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/"},{"name":"https://sourceforge.net/projects/snap7/","refsource":"MISC","url":"https://sourceforge.net/projects/snap7/"}]}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://sourceforge.net/projects/snap7/","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-07-09T00:10:37.459Z"}}]}}}