Description
curl 7.7 through 7.76.1 suffers from an information disclosure when the `-t` command line option, known as `CURLOPT_TELNETOPTIONS` in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to the server using a clear-text network protocol.
Scores
CVSS v3
3.1
EPSS
0.0014
EPSS Percentile
33.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-200
CWE-909
Status
published
Products (16)
None/https://github.com/curl/curl
7.7 through 7.76.1
debian/debian_linux
9.0
fedoraproject/fedora
33
fedoraproject/fedora
34
haxx/curl
7.7 - 7.76.1
oracle/communications_cloud_native_core_binding_support_function
1.11.0
oracle/communications_cloud_native_core_network_function_cloud_native_environment
1.10.0
oracle/communications_cloud_native_core_network_repository_function
1.15.0
oracle/communications_cloud_native_core_network_repository_function
1.15.1
oracle/communications_cloud_native_core_network_slice_selection_function
1.8.0
... and 6 more
Published
Jun 11, 2021
Tracked Since
Feb 18, 2026