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 curlUpgrade libcurl-develUpgrade libcurl | Aug 28, 2019 | Aug 1, 2018 |
| Huawei Euleros 2_0_sp2 | — | Upgrade curlUpgrade libcurl-develUpgrade 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 libcurlUpgrade libcurl-develUpgrade curl | May 22, 2019 | Nov 2, 2016 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Aug 1, 2018 |
| Suse | — | Upgrade libcurl4-openssl1-32bitUpgrade curlUpgrade libcurl4-openssl1Upgrade libcurl4-openssl1-x86Upgrade sles12sp1-docker-imageUpgrade libcurl4-x86Upgrade libcurl4Upgrade libcurl4-32bitUpgrade libcurl-develUpgrade sles12-docker-imageUpgrade curl-openssl1 | Nov 3, 2016 | Nov 3, 2016 |
| Ubuntu | — | Upgrade libcurl3Upgrade libcurl3-gnutlsUpgrade libcurl3-nss | 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 |
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