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.
CVSS Details
- CVSS 3.1 Base Score: 5.3
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade curlUpgrade libcurl-develUpgrade libcurl-minimalUpgrade libcurl | May 4, 2022 | Aug 5, 2021 |
| Alpine Linux | — | Upgrade curl | Aug 22, 2024 | Aug 5, 2021 |
| Amazon Linux Ami 2 | — | Upgrade curlUpgrade libcurl-develUpgrade libcurlUpgrade curl-debuginfo | Sep 16, 2021 | Aug 5, 2021 |
| Apple Osx Curl | — | Apply OS X security update 2021-005 CatalinaUpgrade macOS to the latest version | Nov 17, 2021 | Aug 5, 2021 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Aug 5, 2021 |
| Centos_linux | — | Upgrade libcurl-debuginfoUpgrade curl-minimal-debuginfoUpgrade libcurlUpgrade curl-debuginfoUpgrade libcurl-minimal-debuginfoUpgrade curlUpgrade libcurl-develUpgrade libcurl-minimalUpgrade curl-debugsource | Nov 10, 2021 | Aug 5, 2021 |
| Freebsd | — | Upgrade curl | Nov 4, 2022 | Jul 21, 2021 |
| Gentoo Linux | — | Upgrade net-misc/curl. | Dec 19, 2022 | Aug 5, 2021 |
| Huawei Euleros 2_0_sp3 | — | Upgrade libcurlUpgrade curlUpgrade libcurl-devel | May 25, 2022 | Aug 5, 2021 |
| Huawei Euleros 2_0_sp5 | — | Upgrade curlUpgrade libcurlUpgrade libcurl-devel | Nov 12, 2021 | Aug 5, 2021 |
| Huawei Euleros 2_0_sp8 | — | Upgrade libcurl-develUpgrade curlUpgrade libcurl | Sep 24, 2021 | Aug 5, 2021 |
| Huawei Euleros 2_0_sp9 | — | Upgrade curlUpgrade libcurl | Nov 12, 2021 | Aug 5, 2021 |
| Oracle Solaris | — | Upgrade web/curl to version 7.79.0-11.4.39.0.1.107.0 on Solaris 11.4 | Nov 17, 2021 | Aug 5, 2021 |
| Oracle_linux | — | Upgrade curlUpgrade libcurl-develUpgrade libcurl-minimalUpgrade libcurl | Nov 17, 2021 | Jul 21, 2021 |
| Redhat_linux | — | Upgrade libcurl-minimalUpgrade libcurlNo solution existsUpgrade curl-debugsourceUpgrade curl-minimal-debuginfoUpgrade curl-debuginfoUpgrade curlUpgrade libcurl-minimal-debuginfoUpgrade libcurl-develUpgrade libcurl-debuginfo | Nov 10, 2021 | Aug 5, 2021 |
| Rocky_linux | — | Upgrade libcurl-debuginfoUpgrade libcurl-develUpgrade curl-debuginfoUpgrade curl-debugsourceUpgrade libcurl-minimal-debuginfoUpgrade curlUpgrade libcurlUpgrade libcurl-minimal | May 5, 2022 | Aug 5, 2021 |
| Splunk | — | Upgrade Splunk Enterprise to version 8.1.14Upgrade Splunk Enterprise to version 9.1.1Upgrade Splunk Enterprise to version 8.2.12Upgrade Splunk Enterprise to version 9.0.6Upgrade Splunk Universal Forwarder to version 9.0.5Upgrade Splunk Universal Forwarder to version 9.1.1Upgrade Splunk Enterprise to version 8.2.11Upgrade Splunk Universal Forwarder to version 8.1.14Upgrade Splunk Universal Forwarder to version 9.0.6Upgrade Splunk Universal Forwarder to version 8.2.11Upgrade Splunk Universal Forwarder to version 8.2.12Upgrade Splunk Enterprise to version 9.0.5 | Sep 30, 2025 | Aug 5, 2021 |
| Suse | — | Upgrade libcurl-devel-32bitUpgrade libcurl4Upgrade libcurl4-miniUpgrade libcurl4-openssl1-32bitUpgrade curl-miniUpgrade libcurl4-32bitUpgrade curl-openssl1Upgrade libcurl-develUpgrade curlUpgrade libcurl4-openssl1-x86Upgrade libcurl4-openssl1Upgrade libcurl-mini-devel | Jul 22, 2021 | Jul 21, 2021 |
| Ubuntu | — | Upgrade libcurl3 (Ubuntu Pro)Upgrade curlUpgrade libcurl3-nssUpgrade libcurl3-gnutls (Ubuntu Pro)Upgrade libcurl3-gnutlsUpgrade libcurl3-nss (Ubuntu Pro)Upgrade curl (Ubuntu Pro)Upgrade libcurl4 | Jul 23, 2021 | Jul 21, 2021 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Aug 5, 2021 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub