The bottom line: Multiple security vulnerabilities in strongSwan enable DoS attacks and potential remote code execution without authentication.
Several weaknesses have been discovered in strongSwan that allow attackers to conduct denial-of-service attacks or execute arbitrary code. The IPsec framework is widespread in many VPN and network infrastructure deployments.
The open-source IPsec framework strongSwan contains multiple vulnerabilities that can be exploited by remote attackers without authentication. The gaps enable both denial-of-service attacks (DoS) on the one hand, and the possibility of executing arbitrary code with the privileges of the strongSwan process on the other.
For CISOs, this represents a significant risk in environments that use strongSwan for VPN connections or IPsec-based network segmentation. An anonymous, unauthenticated attack is a critical threat to the availability and integrity of network infrastructure.
Priority should be placed on promptly identifying affected strongSwan installations, verifying their respective version currency, and rapidly deploying security updates. In parallel, network access to VPN endpoints and IPsec gateways should be reviewed and, if necessary, restrictively limited.
Source: wid.cert-bund.de · Published 17 June 2026
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