CVE-2021-33574The mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free.
Updated under an hour ago ()
Does this affect you?
It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 15 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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.
- CVSS
- 9.8 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
gnu glibc gnu:glibc | 2.32; 2.33 | NVD |
fedoraproject fedora fedoraproject:fedora | 33; 34 | NVD |
netapp cloud_backup netapp:cloud_backup | all versions | NVD |
netapp e-series_santricity_os_controller netapp:e-series_santricity_os_controller | from 11.0 through 11.70.1 | NVD |
netapp solidfire_baseboard_management_controller_firmware netapp:solidfire_baseboard_management_controller_firmware | all versions | NVD |
netapp h300s_firmware netapp:h300s_firmware | all versions | NVD |
netapp h500s_firmware netapp:h500s_firmware | all versions | NVD |
netapp h700s_firmware netapp:h700s_firmware | all versions | NVD |
netapp h300e_firmware netapp:h300e_firmware | all versions | NVD |
netapp h500e_firmware netapp:h500e_firmware | all versions | NVD |
netapp h700e_firmware netapp:h700e_firmware | all versions | NVD |
netapp h410s_firmware netapp:h410s_firmware | all versions | NVD |
debian debian_linux debian:debian_linux | 10.0 | NVD |
References
- https://sourceware.org/bugzilla/show_bug.cgi?id=27896exploit, issue-tracking, third-party-advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=27896#c1issue-tracking
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RBUUWUGXVILQXVWEOU7N42ICHPJNAEUP/vendor-advisory
- https://security.netapp.com/advisory/ntap-20210629-0005/third-party-advisory
- https://security.gentoo.org/glsa/202107-07vendor-advisory, third-party-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KJYYIMDDYOHTP2PORLABTOHYQYYREZDD/vendor-advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00021.htmlmailing-list, third-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-831302.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.