CVE-2021-3580A flaw was found in the way nettle's RSA decryption functions handled specially crafted ciphertext.
Updated under an hour ago ()
Does this affect you?
It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 6 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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A flaw was found in the way nettle's RSA decryption functions handled specially crafted ciphertext. An attacker could use this flaw to provide a manipulated ciphertext leading to application crash and denial of service.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-20
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- 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 |
nettle_project nettle nettle_project:nettle | before 3.7.3 | NVD |
redhat enterprise_linux redhat:enterprise_linux | 7.0; 8.0 | NVD |
debian debian_linux debian:debian_linux | 9.0 | NVD |
netapp ontap_select_deploy_administration_utility netapp:ontap_select_deploy_administration_utility | all versions | NVD |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1967983issue-tracking, patch, third-party-advisory
- https://lists.debian.org/debian-lts-announce/2021/09/msg00008.htmlmailing-list, third-party-advisory
- https://security.netapp.com/advisory/ntap-20211104-0006/third-party-advisory
- https://security.gentoo.org/glsa/202401-24vendor-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.