CVE-2021-33560Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen app…
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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 10 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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Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen appropriately. This, for example, affects use of ElGamal in OpenPGP.
- CVSS
- 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-325
- 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 |
gnupg libgcrypt gnupg:libgcrypt | before 1.8.8; from 1.9.0 before 1.9.3 | NVD |
debian debian_linux debian:debian_linux | 9.0 | NVD |
fedoraproject fedora fedoraproject:fedora | 33; 34 | NVD |
oracle communications_cloud_native_core_binding_support_function oracle:communications_cloud_native_core_binding_support_function | 1.11.0 | NVD |
oracle communications_cloud_native_core_network_function_cloud_native_environment oracle:communications_cloud_native_core_network_function_cloud_native_environment | 1.9.0; 1.10.0 | NVD |
oracle communications_cloud_native_core_network_repository_function oracle:communications_cloud_native_core_network_repository_function | 1.14.0; 1.15.0; 1.15.1 | NVD |
oracle communications_cloud_native_core_network_slice_selection_function oracle:communications_cloud_native_core_network_slice_selection_function | 1.8.0 | NVD |
oracle communications_cloud_native_core_service_communication_proxy oracle:communications_cloud_native_core_service_communication_proxy | 1.15.0 | NVD |
References
- https://dev.gnupg.org/T5328vendor-advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00021.htmlmailing-list, third-party-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7OAPCUGPF3VLA7QAJUQSL255D4ITVTL/vendor-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB/vendor-advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlthird-party-advisory
- https://dev.gnupg.org/T5466release-notes, vendor-advisory
- https://dev.gnupg.org/T5305release-notes, vendor-advisory
- https://dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61patch, vendor-advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlpatch, third-party-advisory
- https://www.oracle.com/security-alerts/cpuapr2022.htmlpatch, third-party-advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlpatch, third-party-advisory
- https://security.gentoo.org/glsa/202210-13vendor-advisory, third-party-advisory
- 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.