CVE-2015-3143
curl: re-using authenticated connection when unauthenticated
Severity
ModerateRed Hat Product Security
CVSS 2.0
Review impact separately from score.
Published · April 22, 2015
Updated · November 21, 2025
Description
It was discovered that libcurl could incorrectly reuse NTLM-authenticated connections for subsequent unauthenticated requests to the same host. If an application using libcurl established an NTLM-authenticated connection to a server, and sent subsequent unauthenticated requests to the same server, the unauthenticated requests could be sent over the NTLM-authenticated connection, appearing as if they were sent by the NTLM authenticated user.
Statement
This issue affects the version of curl package as shipped with Red Hat Enterprise Linux 5. Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This issue is not planned to be addressed in a future update for Red Hat Enterprise Linux 5.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 2.0 · 4AV:N/AC:H/Au:N/C:P/I:P/A:N
CWE-287 · Improper Authentication