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CVE-2023-27535

Published: Mar 30, 2023Updated: Jun 9, 2025 Sources: CVE List NVD BDU csafCWE-305
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
1.6%
Top 27.3%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-305CWE-287

Affected Products

https://github.com/curl/curln/a
libcurlhaxxOSS Libraries
fedorafedoraproject
On-premOS
Operating Systems / linux-distro
debian linuxdebian
On-premOS
Operating Systems / linux-distro
active iq unified managernetappHardware Firmware
haxxoss-projectSEOSS Librariesaka haxx.se
fedoraprojectoss-projectUSOperating Systemsaka fedora project
debianoss-projectGBOperating Systemsaka debian gnu/linux
netappcommercialUSHardware Firmware
and 27 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://hackerone.com/reports/1892780
hackerone.com
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/
lists.fedoraproject.org
https://security.netapp.com/advisory/ntap-20230420-0010/
security.netapp.com
and 26 more references View all →

Timeline

Published
Mar 30, 2023
Last Updated
Jun 9, 2025

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