EUVD-2026-75903
GHSA-j374-979j-mcx7
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
IKE certificate exchange is pre-authentication and network-exposed; crash causes availability loss only with no data disclosure.
Primary rating from Vendor (vendor:ubuntu).
CVSS VectorVendor: vendor:ubuntu
Lifecycle Timeline
6DescriptionCVE.org
NULL-Pointer Dereference in Attribute Certificate Validation
AnalysisAI
Denial of service via NULL-pointer dereference in strongSwan's x509 plugin affects versions 4.2.0 through 6.0.x, triggered during verification of X.509 attribute certificates. An unauthenticated remote attacker can crash the charon IKE daemon by presenting a crafted attribute certificate during VPN handshake negotiation, taking the gateway offline. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to a strongSwan IKE endpoint - typically UDP port 500 (ISAKMP) or UDP port 4500 (NAT-T) - running strongSwan version 4.2.0 or newer. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 base score (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) correctly captures the core risk: unauthenticated remote exploitation with full availability impact against the VPN daemon, requiring no complexity or interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to strongSwan 6.1.0 or later, available at https://github.com/strongswan/strongswan/releases/tag/6.1.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running strongSwan and document their current versions (verify via strongSwan --version or check system package managers). …
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Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Denial Of Service
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External POC / Exploit Code
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