Low
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-22898
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:27 UTC · Revision 1
Source evidence
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.
osv:CVE-2021-22898
Complete source record
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"provider": "osv",
"references": [
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"https://curl.se/docs/CVE-2021-22898.html",
"https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde",
"https://hackerone.com/reports/1176461",
"https://www.oracle.com//security-alerts/cpujul2021.html",
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"source_id": "core-osv",
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"published_at": "2021-06-11T16:15:11.043+00:00"
}