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CVE

CWE

Training

CVE-2021-22925

Published: Aug 5, 2021

Modified: Apr 16, 2026

PUBLISHED

Description

curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.

Vendor	Product	Versions
n/a	https://github.com/curl/curl	affected `curl 7.7 to and including 7.77.0`

Weaknesses (CWE)

References

https://hackerone.com/reports/1223882

FEDORA-2021-5d21b90a30

vendor-advisory

20210921 APPLE-SA-2021-09-20-8 Additional information for APPLE-SA-2021-09-13-4 Security Update 2021-005 Catalina

mailing-list

20210921 APPLE-SA-2021-09-20-7 Additional information for APPLE-SA-2021-09-13-3 macOS Big Sur 11.6

mailing-list

https://www.oracle.com/security-alerts/cpuoct2021.html

https://security.netapp.com/advisory/ntap-20210902-0003/

https://support.apple.com/kb/HT212805

https://support.apple.com/kb/HT212804

https://www.oracle.com/security-alerts/cpujan2022.html

https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf

https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf

vendor-advisory

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