Low 3.3Published Jun 30, 2021

CVE-2021-36087The CIL compiler in SELinux 3.2 has a heap-based buffer over-read in ebitmap_match_any (called indirectly from cil_check_neverallow).

Updated under an hour ago (Oct 26, 2026, 1:23 PM ET)

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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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Every CVE for Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP

Exploited in the last 30 days

The CIL compiler in SELinux 3.2 has a heap-based buffer over-read in ebitmap_match_any (called indirectly from cil_check_neverallow). This occurs because there is sometimes a lack of checks for invalid statements in an optional block.

CVSS: 3.3 LOW (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
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

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
Siemens RUGGEDCOM ROX MX5000 siemens:ruggedcom_rox_mx5000 (from the name)	before V2.17.0	CISA ADP
Siemens RUGGEDCOM ROX MX5000RE siemens:ruggedcom_rox_mx5000re (from the name)	before V2.17.0	CISA ADP
Siemens RUGGEDCOM ROX RX1400 siemens:ruggedcom_rox_rx1400 (from the name)	before V2.17.0	CISA ADP
Siemens RUGGEDCOM ROX RX1500 siemens:ruggedcom_rox_rx1500 (from the name)	before V2.17.0	CISA ADP
Siemens RUGGEDCOM ROX RX1501 siemens:ruggedcom_rox_rx1501 (from the name)	before V2.17.0	CISA ADP
Siemens RUGGEDCOM ROX RX1510 siemens:ruggedcom_rox_rx1510 (from the name)	before V2.17.0	CISA ADP
Siemens RUGGEDCOM ROX RX1511 siemens:ruggedcom_rox_rx1511 (from the name)	before V2.17.0	CISA ADP
1–10 of 16

References

References

https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-585.yaml	x-refsource-misc, third-party-advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32675	x-refsource-misc, exploit, issue-tracking, patch, third-party-advisory
https://lore.kernel.org/selinux/CAEN2sdqJKHvDzPnxS-J8grU8fSf32DDtx=kyh84OsCq_Vm+yaQ%40mail.gmail.com/T/	x-refsource-misc
https://github.com/SELinuxProject/selinux/commit/340f0eb7f3673e8aacaf0a96cbfcd4d12a405521	x-refsource-misc, patch, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR/	vendor-advisory, x-refsource-fedora
https://lists.debian.org/debian-lts-announce/2024/10/msg00021.html
https://security.netapp.com/advisory/ntap-20250207-0004/
https://cert-portal.siemens.com/productcert/html/ssa-202008.html
https://cert-portal.siemens.com/productcert/html/ssa-398330.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.