CVE intelligence and bounded remediation
CVE-2021-22945 — Haxx Libcurl security vulnerability
Critical
CVSS 9.1
When sending data to an MQTT server, libcurl <= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.
- Severity
- Critical
- CVSS
- 9.1 (3.1)
- Published
- 2021-09-23
- CISA KEV
- Not currently listed
- Ecosystem
- software/application
- Weaknesses
- CWE-415
Affected products
- haxx / libcurl
- fedoraproject / fedora / 33
- fedoraproject / fedora / 35
- netapp / cloud_backup
- netapp / clustered_data_ontap
- oracle / mysql_server
Showing 6 representative product identities from 21 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.
Matched remediation archetype
Buffer bounds, memory safety, and memory corruption
This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.
Check exposure
- Identify affected native-code versions, build flags, architectures, parsers, codecs, drivers, and input paths in all shipped artifacts.
- Determine whether untrusted data reaches the affected routine and the process privilege, sandbox, and network exposure.
- Confirm statically linked, vendored, firmware, and platform-provided copies, not only package-manager records.
Remediate safely
- Apply the maintained upstream correction or replace the affected component, then rebuild every dependent artifact from clean inputs.
- Adopt bounds-checked interfaces, validated sizes and integer conversions, clear ownership, and memory-safe components where practical.
- Enable supported compiler and runtime hardening and add sanitized tests and fuzz regression seeds derived from non-weaponized fixtures.
Authoritative sources
Complete CVE record and remediation plan
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