A flaw was found in curl before version 7.51.0 When re-using a connection, curl was doing case insensitive comparisons of user name and password with the existing connections. This means that if an unused connection with proper credentials exists for a protocol that has connection-scoped credentials, an attacker can cause that connection to be reused if s/he knows the case-insensitive version of the correct password.
CVSS Details
- CVSS 3.1 Base Score: 5.9
- CVSS 3.0 Base Score: 3.7
- CVSS 3.0 Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade curl | Aug 1, 2018 | Aug 1, 2018 |
| Amazon_linux | — | Upgrade curl | Nov 11, 2016 | Nov 3, 2016 |
| Apple Osx Curl | — | Upgrade macOS to the latest version | Dec 16, 2016 | Dec 16, 2016 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Aug 1, 2018 |
| Debian | — | Upgrade curl | Nov 4, 2016 | Nov 3, 2016 |
| F5 Big Ip | — | Update F5 BIG-IP to the latest version | Jun 17, 2026 | Apr 12, 2017 |
| Freebsd | — | Upgrade curl | Nov 14, 2016 | Nov 2, 2016 |
| Gentoo Linux | — | Upgrade net-misc/curl. | Oct 30, 2017 | Jan 19, 2017 |
| Huawei Euleros 2_0_sp1 | — | Upgrade libcurlUpgrade libcurl-develUpgrade curl | Aug 28, 2019 | Aug 1, 2018 |
| Huawei Euleros 2_0_sp2 | — | Upgrade libcurl-develUpgrade curlUpgrade libcurl | Aug 28, 2019 | Aug 1, 2018 |
| Oracle Solaris | — | Upgrade web/curl to version 7.45.0-0.175.3.18.0.1.0 on Solaris 11.3 | May 29, 2017 | May 29, 2017 |
| Oracle_linux | — | Upgrade libcurl-develUpgrade curlUpgrade libcurl | May 22, 2019 | Nov 2, 2016 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Aug 1, 2018 |
| Suse | — | Upgrade libcurl4-openssl1-32bitUpgrade curlUpgrade libcurl4-32bitUpgrade curl-openssl1Upgrade libcurl4Upgrade sles12-docker-imageUpgrade libcurl-develUpgrade sles12sp1-docker-imageUpgrade libcurl4-openssl1-x86Upgrade libcurl4-x86Upgrade libcurl4-openssl1 | Nov 3, 2016 | Nov 3, 2016 |
| Ubuntu | — | Upgrade libcurl3Upgrade libcurl3-nssUpgrade libcurl3-gnutls | Nov 3, 2016 | Nov 3, 2016 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Aug 1, 2018 |
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