{"cve":"CVE-2021-22898","nvd":{"published":"2021-06-11T16:15:11.043","modified":"2026-10-14T11:16:52.873","status":"Modified","description":"curl 7.7 through 7.76.1 suffers from an information disclosure when the `-t` command line option, known as `CURLOPT_TELNETOPTIONS` in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to the server using a clear-text network protocol.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N","score":3.1},"cwes":["CWE-909","CWE-200"],"references":["http://www.openwall.com/lists/oss-security/2021/07/21/4","https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","https://curl.se/docs/CVE-2021-22898.html","https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde","https://hackerone.com/reports/1176461"],"products":["debian:debian_linux","fedoraproject:fedora","haxx:curl","oracle:communications_cloud_native_core_binding_support_function","oracle:communications_cloud_native_core_network_function_cloud_native_environment","oracle:communications_cloud_native_core_network_repository_function","oracle:communications_cloud_native_core_network_slice_selection_function","oracle:communications_cloud_native_core_service_communication_proxy","oracle:essbase","oracle:mysql_server","siemens:sinec_infrastructure_network_services","splunk:universal_forwarder"],"source":"nvd","synced_at":"2026-10-19T21:20:07.141963181+00:00"},"epss":{"cve":"CVE-2021-22898","score":0.04507,"percentile":0.91444,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}