{"id":"CVE-2021-20235","state":"PUBLISHED","title":"There's a flaw in the zeromq server in versions before 4.3.3 in src/decoder_allocators.hpp. The decoder static allocator could have its sized changed, but the buffer would remain t","description":"There's a flaw in the zeromq server in versions before 4.3.3 in src/decoder_allocators.hpp. The decoder static allocator could have its sized changed, but the buffer would remain the same as it is a static buffer. A remote, unauthenticated attacker who sends a crafted request to the zeromq server could trigger a buffer overflow WRITE of arbitrary data if CURVE/ZAP authentication is not enabled. The greatest impact of this flaw is to application availability, data integrity, and confidentiality.","publishedAt":"2021-04-01T13:47:05.000Z","updatedAt":"2024-08-03T17:37:22.831Z","severity":null,"assigner":"redhat","products":["n/a zeromq"],"affected":[{"vendor":"n/a","product":"zeromq","versions":[{"version":"zeromq 4.3.3","status":"affected"}]}],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1921983","https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6"],"weaknesses":["CWE-120"],"ingestedAt":"2026-10-29T19:47:55.610Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/20xxx/CVE-2021-20235.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-20235","state":"PUBLISHED","datePublished":"2021-04-01T13:47:05.000Z","dateUpdated":"2024-08-03T17:37:22.831Z","assignerShortName":"redhat","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","dateReserved":"2020-12-17T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"There's a flaw in the zeromq server in versions before 4.3.3 in src/decoder_allocators.hpp. The decoder static allocator could have its sized changed, but the buffer would remain the same as it is a static buffer. A remote, unauthenticated attacker who sends a crafted request to the zeromq server could trigger a buffer overflow WRITE of arbitrary data if CURVE/ZAP authentication is not enabled. The greatest impact of this flaw is to application availability, data integrity, and confidentiality."}],"affected":[{"vendor":"n/a","product":"zeromq","versions":[{"version":"zeromq 4.3.3","status":"affected"}]}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1921983","tags":["x_refsource_MISC"]},{"url":"https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6","tags":["x_refsource_MISC"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-120","description":"CWE-120->CWE-787","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"redhat","dateUpdated":"2021-04-01T13:47:05.000Z","orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"secalert@redhat.com","ID":"CVE-2021-20235","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"zeromq","version":{"version_data":[{"version_value":"zeromq 4.3.3"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"There's a flaw in the zeromq server in versions before 4.3.3 in src/decoder_allocators.hpp. The decoder static allocator could have its sized changed, but the buffer would remain the same as it is a static buffer. A remote, unauthenticated attacker who sends a crafted request to the zeromq server could trigger a buffer overflow WRITE of arbitrary data if CURVE/ZAP authentication is not enabled. The greatest impact of this flaw is to application availability, data integrity, and confidentiality."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-120->CWE-787"}]}]},"references":{"reference_data":[{"name":"https://bugzilla.redhat.com/show_bug.cgi?id=1921983","refsource":"MISC","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1921983"},{"name":"https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6","refsource":"MISC","url":"https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6"}]}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1921983","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T17:37:22.831Z"}}]}}}