High 7.5Published Oct 23, 2022

CVE-2022-43680In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in out-of-memory situations.

Updated under an hour ago (Oct 26, 2026, 5:23 PM ET)

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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 14 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

In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in out-of-memory situations.

CVSS: 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-416
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
libexpat_project libexpat libexpat_project:libexpat	through 2.4.9	NVD
debian debian_linux debian:debian_linux	10.0; 11.0	NVD
fedoraproject fedora fedoraproject:fedora	35; 36; 37	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 h410s_firmware netapp:h410s_firmware	all versions	NVD
1–10 of 15

References

References

https://github.com/libexpat/libexpat/pull/650	exploit, issue-tracking, patch, third-party-advisory
https://github.com/libexpat/libexpat/issues/649	exploit, issue-tracking, patch, third-party-advisory
https://github.com/libexpat/libexpat/pull/616	exploit, issue-tracking, patch, third-party-advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00033.html	mailing-list, third-party-advisory
https://www.debian.org/security/2022/dsa-5266	vendor-advisory, third-party-advisory
https://security.gentoo.org/glsa/202210-38	vendor-advisory, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BY4OPSIB33ETNUXZY2UPZ4NGQ3OKDY4D/	vendor-advisory, mailing-list, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AJ5VY2VYXE4WTRGQ6LMGLF6FV3SY37YE/	vendor-advisory, mailing-list, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUJ2BULJTZ2BMSKQHB6US674P55UCWWS/	vendor-advisory, mailing-list, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XG5XOOB7CD55CEE6OJYKSACSIMQ4RWQ6/	vendor-advisory, mailing-list, third-party-advisory
1–10 of 17

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.