CVE-2025-64332 is a stack-based buffer overflow vulnerability identified in the Suricata network intrusion detection and prevention system (IDS/IPS) developed by the Open Information Security Foundation (OISF). The vulnerability specifically affects versions prior to 7.0.13 and 8.0.2 when SWF (ShockWave Flash) decompression is enabled. Suricata processes network traffic and can decompress SWF content to inspect it for malicious activity. The flaw arises from improper handling of SWF decompression data, leading to a stack overflow condition that causes Suricata to crash, resulting in a denial-of-service (DoS) condition. The vulnerability is classified under CWE-121 (Stack-based Buffer Overflow), indicating that the overflow occurs on the call stack, which can overwrite return addresses or other control data. According to the CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), the vulnerability is remotely exploitable over the network without any authentication or user interaction, with low attack complexity and no impact on confidentiality or integrity, but a high impact on availability. No known exploits are currently reported in the wild. Mitigation involves upgrading Suricata to versions 7.0.13 or 8.0.2 and later, where the issue has been patched. As a workaround, disabling SWF decompression (which is off by default) or setting the decompress-depth parameter to less than half the stack size can reduce the risk of triggering the overflow. This vulnerability could be leveraged by attackers to disrupt network monitoring and intrusion detection capabilities, potentially masking other malicious activities.

For European organizations, the primary impact of CVE-2025-64332 is the potential denial-of-service of Suricata-based network security monitoring and intrusion detection systems. This disruption can degrade an organization's ability to detect and respond to network threats, increasing exposure to other attacks. Critical infrastructure sectors, financial institutions, telecommunications providers, and large enterprises that rely heavily on Suricata for real-time network security monitoring are at heightened risk. The lack of confidentiality or integrity impact means data breaches are unlikely directly from this vulnerability, but the availability impact can indirectly facilitate more severe attacks by blinding defenders. Given Suricata's widespread use in open-source and commercial security solutions across Europe, unpatched systems could experience service outages or forced downtime. This may also affect managed security service providers (MSSPs) using Suricata to monitor client networks, potentially impacting multiple organizations. The ease of remote exploitation without authentication increases the urgency for timely patching and mitigation.

1. Upgrade Suricata installations to version 7.0.13, 8.0.2, or later where the vulnerability is patched. 2. If immediate upgrading is not feasible, disable SWF decompression by ensuring the 'swf-decompression' setting in suricata.yaml is set to false (default). 3. If SWF decompression must remain enabled, configure the 'decompress-depth' parameter to a value less than half the stack size to limit the risk of overflow. 4. Monitor Suricata logs and system stability for unexpected crashes or restarts that may indicate exploitation attempts. 5. Employ network traffic filtering to limit exposure to SWF content from untrusted sources, reducing the attack surface. 6. Incorporate Suricata version checks and configuration audits into regular security assessments and patch management processes. 7. Coordinate with managed security service providers to confirm their Suricata deployments are patched or mitigated accordingly. 8. Consider deploying additional IDS/IPS solutions or failover mechanisms to maintain network monitoring availability during patching or mitigation activities.