CVE-2021-41990

The gmp plugin in strongSwan before 5.9.4 has a remote integer overflow via a crafted certificate with an RSASSA-PSS signature. For example, this can be triggered by an unrelated self-signed CA certificate sent by an initiator. Remote code execution cannot occur.

• CWE-190

• https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdfThird Party Advisory
• https://github.com/strongswan/strongswan/releases/tag/5.9.4Release Notes, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/
• https://www.debian.org/security/2021/dsa-4989Third Party Advisory
• https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-%28cve-2021-41990%29.html
• https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdfThird Party Advisory
• https://github.com/strongswan/strongswan/releases/tag/5.9.4Release Notes, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/
• https://www.debian.org/security/2021/dsa-4989Third Party Advisory
• https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-%28cve-2021-41990%29.html

Published

Oct 18, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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