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 | alpine-linux-upgrade-curl | Aug 1, 2018 | Aug 1, 2018 | |
| Amazon_linux | — | amazon-linux-upgrade-curl | Nov 11, 2016 | Nov 3, 2016 |
| Apple Osx Curl | apple-osx-upgrade-latest | Dec 16, 2016 | Dec 16, 2016 | |
| Arch Linux | arch-linux-upgrade-latest | Jul 11, 2025 | Aug 1, 2018 | |
| Debian | debian-upgrade-curl | Nov 4, 2016 | Nov 3, 2016 | |
| F5 Big Ip | f5-bigip-upgrade-latest | Jun 17, 2026 | Apr 12, 2017 | |
| Freebsd | freebsd-upgrade-package-curl | Nov 14, 2016 | Nov 2, 2016 | |
| Gentoo Linux | gentoo-linux-upgrade-net-misc-curl | Oct 30, 2017 | Jan 19, 2017 | |
| Huawei Euleros 2_0_sp1 | huawei-euleros-2_0_sp1-upgrade-curlhuawei-euleros-2_0_sp1-upgrade-libcurlhuawei-euleros-2_0_sp1-upgrade-libcurl-devel | Aug 28, 2019 | Aug 1, 2018 | |
| Huawei Euleros 2_0_sp2 | huawei-euleros-2_0_sp2-upgrade-curlhuawei-euleros-2_0_sp2-upgrade-libcurlhuawei-euleros-2_0_sp2-upgrade-libcurl-devel | Aug 28, 2019 | Aug 1, 2018 | |
| Oracle Solaris | oracle-solaris-11-3-upgrade-web-curl-7-45-0-0-175-3-18-0-1-0 | May 29, 2017 | May 29, 2017 | |
| Oracle_linux | — | oracle-linux-upgrade-curloracle-linux-upgrade-libcurloracle-linux-upgrade-libcurl-devel | May 22, 2019 | Nov 2, 2016 |
| Redhat_linux | no-fix-redhat-rpm-package | Jul 9, 2025 | Aug 1, 2018 | |
| Suse | — | suse-upgrade-curlsuse-upgrade-curl-openssl1suse-upgrade-libcurl-develsuse-upgrade-libcurl4suse-upgrade-libcurl4-32bitsuse-upgrade-libcurl4-openssl1suse-upgrade-libcurl4-openssl1-32bitsuse-upgrade-libcurl4-openssl1-x86suse-upgrade-libcurl4-x86suse-upgrade-sles12-docker-imagesuse-upgrade-sles12sp1-docker-image | Nov 3, 2016 | Nov 3, 2016 |
| Ubuntu | ubuntu-upgrade-libcurl3ubuntu-upgrade-libcurl3-gnutlsubuntu-upgrade-libcurl3-nss | Nov 3, 2016 | Nov 3, 2016 | |
| Vmware Photon_os | vmware-photon_os_update_tdnf | Jan 20, 2025 | Aug 1, 2018 |
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