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October 14, 2026

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CVE-2021-33574NVD

Vulnerability Summary

The mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free. It may use the notification thread attributes object (passed through its struct sigevent parameter) after it has been freed by the caller, leading to a denial of service (application crash) or possibly unspecified other impact.
Severity Level
CRITICAL(9.8)
Published Date
May 25, 2021
Last Modified
Oct 14, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
2.87%Probability
Root Weakness (CWE)
CWE-416: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v3.1 Base Metrics — Score 9.8 (CRITICAL)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Gnu Glibc
  • Fedoraproject Fedora
  • Netapp Cloud Backup
  • Netapp E-series Santricity Os Controller >= 11.0 and <= 11.70.1
  • Netapp Solidfire Baseboard Management Controller Firmware
  • Netapp H300s Firmware
  • Netapp H500s Firmware
  • Netapp H700s Firmware
  • Netapp H300e Firmware
  • Netapp H500e Firmware
  • Netapp H700e Firmware
  • Netapp H410s Firmware
  • Debian Debian Linux
Patched Versions
Not provided by NVD for this CVE.
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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