Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2021-33574
n/a n/a — The mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free.
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U H H H 9.8 .0352 89.1 —
AFFECTED
Product Versions Fixed
n/a n/a – —
TIMELINE
May 25 Reserved by mitre
May 25 Published (CNA: mitre)
Oct 14 ENRICHED — CVE-2021-33574. Received CVSS 9.8 and CPE data from NVD.
Oct 14 EXPLOIT PUBLISHED — CVE-2021-33574. Public exploit reference added.
Description
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.
Lifecycle
Complete event history — 4 events, chronological
| Date | Event | Detail |
|---|
| May 25, 2021 | Reserved | Reserved by mitre |
| May 25, 2021 | Published | Published (CNA: mitre) |
| October 14, 2026 | ENRICHED | ENRICHED — CVE-2021-33574. Received CVSS 9.8 and CPE data from NVD. |
| October 14, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2021-33574. Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| n/a | n/a | — | n/a | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-33574 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
