--- id: CVE-2021-22925 title: >- curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl summary: >- curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, lib… severity: medium cvss: 5.3 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N' cwe: - CWE-200 - CWE-908 vendor: haxx product: curl affected: - 'curl >= 7.7, < 7.78.0' - fedora = 33 - cloud_backup - clustered_data_ontap - hci_management_node - solidfire - mac_os_x = 10.15.7 - macos = 11.0 - macos = 11.0.1 - macos = 11.1 - macos = 11.1.0 - macos = 11.2 - macos = 11.2.1 - macos = 11.3 - macos = 11.3.1 - macos = 11.4 - macos = 11.5 - 'mysql_server >= 5.7.0, <= 5.7.35' - 'mysql_server >= 8.0.0, <= 8.0.26' - peoplesoft_enterprise_peopletools = 8.57 - peoplesoft_enterprise_peopletools = 8.58 - peoplesoft_enterprise_peopletools = 8.59 - sinec_infrastructure_network_services < 1.0.1.1 - sinema_remote_connect_server < 3.1 - h300s_firmware - h500s_firmware - h700s_firmware - h300e_firmware - h500e_firmware - h700e_firmware - h410s_firmware - 'universal_forwarder >= 8.2.0, < 8.2.12' - 'universal_forwarder >= 9.0.0, < 9.0.6' - universal_forwarder = 9.1.0 patched: - curl 7.78.0 - sinec_infrastructure_network_services 1.0.1.1 - sinema_remote_connect_server 3.1 - universal_forwarder 9.0.6 published: '2021-08-05' updated: '2026-10-14' sourceUpdated: '2026-10-14T11:16:54.113' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-22925' references: - url: 'http://seclists.org/fulldisclosure/2021/Sep/39' label: support@hackerone.com - url: 'http://seclists.org/fulldisclosure/2021/Sep/40' label: support@hackerone.com - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf' label: support@hackerone.com - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf' label: support@hackerone.com - url: 'https://hackerone.com/reports/1223882' label: support@hackerone.com - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/ label: support@hackerone.com - url: 'https://security.gentoo.org/glsa/202212-01' label: support@hackerone.com - url: 'https://security.netapp.com/advisory/ntap-20210902-0003/' label: support@hackerone.com - url: 'https://support.apple.com/kb/HT212804' label: support@hackerone.com - url: 'https://support.apple.com/kb/HT212805' label: support@hackerone.com - url: 'https://www.oracle.com/security-alerts/cpujan2022.html' label: support@hackerone.com - url: 'https://www.oracle.com/security-alerts/cpuoct2021.html' label: support@hackerone.com - url: 'http://seclists.org/fulldisclosure/2021/Sep/39' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://seclists.org/fulldisclosure/2021/Sep/40' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://hackerone.com/reports/1223882' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/ label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.gentoo.org/glsa/202212-01' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.netapp.com/advisory/ntap-20210902-0003/' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://support.apple.com/kb/HT212804' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://support.apple.com/kb/HT212805' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.oracle.com/security-alerts/cpujan2022.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.oracle.com/security-alerts/cpuoct2021.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://cert-portal.siemens.com/productcert/html/ssa-389290.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e - url: 'https://cert-portal.siemens.com/productcert/html/ssa-484086.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e tags: - nvd epss: 0.04929 epssPercentile: 0.91953 ingestedAt: '2026-10-14T11:27:22.126Z' --- ## Overview curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application. ## Affected - `curl >= 7.7, < 7.78.0` - `fedora = 33` - `cloud_backup` - `clustered_data_ontap` - `hci_management_node` - `solidfire` - `mac_os_x = 10.15.7` - `macos = 11.0` - `macos = 11.0.1` - `macos = 11.1` - `macos = 11.1.0` - `macos = 11.2` - `macos = 11.2.1` - `macos = 11.3` - `macos = 11.3.1` - `macos = 11.4` - `macos = 11.5` - `mysql_server >= 5.7.0, <= 5.7.35` - `mysql_server >= 8.0.0, <= 8.0.26` - `peoplesoft_enterprise_peopletools = 8.57` - `peoplesoft_enterprise_peopletools = 8.58` - `peoplesoft_enterprise_peopletools = 8.59` - `sinec_infrastructure_network_services < 1.0.1.1` - `sinema_remote_connect_server < 3.1` - `h300s_firmware` - `h500s_firmware` - `h700s_firmware` - `h300e_firmware` - `h500e_firmware` - `h700e_firmware` - `h410s_firmware` - `universal_forwarder >= 8.2.0, < 8.2.12` - `universal_forwarder >= 9.0.0, < 9.0.6` - `universal_forwarder = 9.1.0` ## Remediation Upgrade past the affected range: - `curl 7.78.0` - `sinec_infrastructure_network_services 1.0.1.1` - `sinema_remote_connect_server 3.1` - `universal_forwarder 9.0.6`