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.

Related CVEs

CVE-2021-22898

Key Information

GHSA ID

GHSA-7w8r-q58w-5wcr

Published

May 24, 2022 7:05 PM

Last Modified

March 27, 2024 6:32 PM

CVSS Score

7.5 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: September 28, 2025 6:29 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.