CVE-2023-27538
An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option wa…
Published Mar 30, 2023 · updated Oct 14, 2026 · haxx libcurl
An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.
Code
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No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Mar 30, 2023 · NIST NVD
Detected
An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration
Oct 14, 2026 · NIST NVD
Updated
An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration
Affected
- cpe broadcom/brocade fabric operating system firmwareversion unspecified
- cpe debian/debian linux10.0
- cpe fedoraproject/fedora36
- cpe haxx/libcurlversion unspecified
- cpe netapp/active iq unified managerversion unspecified
- cpe netapp/clustered data ontap9.0
- cpe netapp/h300s firmwareversion unspecified
- cpe netapp/h410s firmwareversion unspecified
- cpe netapp/h500s firmwareversion unspecified
- cpe netapp/h700s firmwareversion unspecified
- cpe splunk/universal forwarderversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2023-27538
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2023-27538
30-day exploitation probability 1.5%
first.org - NIST NVDVulnerability recordCVE-2023-27538
An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse t
nvd.nist.gov