CVE intelligence and bounded remediation

CVE-2021-22925 — curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl

Medium CVSS 5.3

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.

Severity
Medium
CVSS
5.3 (3.1)
Published
2021-08-05
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-200, CWE-908

Affected products

  • haxx / curl
  • fedoraproject / fedora / 33
  • netapp / cloud_backup
  • netapp / clustered_data_ontap
  • netapp / hci_management_node
  • netapp / solidfire

Showing 6 representative product identities from 38 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Information disclosure and sensitive data exposure

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Trace sensitive data through responses, errors, logs, metrics, traces, caches, exports, files, backups, and client bundles.
  • Identify affected subjects, tenants, retention windows, access controls, and downstream copies without opening unnecessary sensitive records.
  • Review metadata, timing, status, length, and existence signals as well as direct content disclosure.

Remediate safely

  • Minimize collection and output, apply field-level authorization and redaction at a centralized boundary, and return generic external errors.
  • Remove secrets and sensitive data from logs, artifacts, URLs, caches, and client-side bundles; rotate credentials that may have been exposed.
  • Update the affected component and add synthetic-data tests for response, error, observability, and export paths.

Authoritative sources

Complete CVE record and remediation plan

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