CVE-2023-27535
5.9 · MEDIUMOverview
CVE-2023-27535 is a medium-severity vulnerability affecting haxx libcurl. It was published on March 30, 2023 and has a CVSS 3.1 base score of 5.9 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
An authentication bypass vulnerability exists in libcurl <8.0.0 in the FTP connection reuse feature that can result in wrong credentials being used during subsequent transfers. Previously created connections are kept in a connection pool for reuse if they match the current setup. However, certain FTP settings such as CURLOPT_FTP_ACCOUNT, CURLOPT_FTP_ALTERNATIVE_TO_USER, CURLOPT_FTP_SSL_CCC, and CURLOPT_USE_SSL were not included in the configuration match checks, causing them to match too easily. This could lead to libcurl using the wrong credentials when performing a transfer, potentially allowing unauthorized access to sensitive information.
Remediation
Check the references section for vendor advisories and patches from haxx. Update libcurl to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| haxx | libcurl | 7.13.0 | Affected |
| splunk | universal_forwarder | >= 8.2.0, < 8.2.12 | Affected |
References
Frequently Asked Questions
What is CVE-2023-27535?
CVE-2023-27535 is a medium-severity vulnerability affecting haxx libcurl. It was published on March 30, 2023 and has a CVSS 3.1 base score of 5.9 (MEDIUM).
How severe is CVE-2023-27535?
This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2023-27535?
Check the references section for vendor advisories and patches from haxx. Update libcurl to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2023-27535?
CyberStrike's AI-powered security agents can automatically detect CVE-2023-27535 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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