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October 14, 2026

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CVE-2021-22945NVD

Vulnerability Summary

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 Level
CRITICAL(9.1)
Published Date
Sep 23, 2021
Last Modified
Oct 14, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
6.68%Probability
Root Weakness (CWE)
CWE-415: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v3.1 Base Metrics — Score 9.1 (CRITICAL)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Haxx Libcurl >= 7.73.0 and <= 7.78.0
  • Fedoraproject Fedora
  • Netapp Cloud Backup
  • Netapp Clustered Data Ontap
  • Oracle Mysql Server >= 5.7.0 and <= 5.7.35
  • Oracle Mysql Server >= 8.0.0 and <= 8.0.26
  • Netapp H300s Firmware
  • Netapp H500s Firmware
  • Netapp H700s Firmware
  • Netapp H300e Firmware
  • Netapp H500e Firmware
  • Netapp H700e Firmware
  • Netapp H410s Firmware
  • Netapp Solidfire Baseboard Management Controller Firmware
  • Apple Macos >= 12.0.0 and < 12.3
  • Siemens Sinec Ins < 1.0.1.1
  • Debian Debian Linux
  • Splunk Universal Forwarder >= 8.2.0 and < 8.2.12
  • Splunk Universal Forwarder >= 9.0.0 and < 9.0.6
  • Splunk Universal Forwarder
Patched Versions
  • Apple Macos 12.3
  • Siemens Sinec Ins 1.0.1.1
  • Splunk Universal Forwarder 8.2.12
  • Splunk Universal Forwarder 9.0.6
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🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫Ad-Free — Uninterrupted experience.

External References