CVE-2025-64334 is a vulnerability classified under CWE-770 (Allocation of Resources Without Limits or Throttling) affecting the Suricata network IDS/IPS/NSM engine developed by the Open Information Security Foundation (OISF). Specifically, versions from 8.0.0 up to but not including 8.0.2 contain a flaw in the handling of compressed HTTP data, particularly involving LZMA decompression. When Suricata processes compressed HTTP responses, it does not impose adequate limits on memory allocation during decompression, which can lead to unbounded memory growth. This uncontrolled resource consumption can exhaust system memory, causing Suricata to crash or become unresponsive, effectively resulting in a denial of service (DoS). The vulnerability can be exploited remotely by an unauthenticated attacker who sends specially crafted compressed HTTP traffic to a network monitored by a vulnerable Suricata instance. No user interaction is required, and the attack vector is network-based, making exploitation feasible in many environments. The issue has been addressed in Suricata version 8.0.2 by implementing proper resource limits during decompression. As a temporary mitigation, disabling LZMA decompression or limiting the response-body-limit size in Suricata’s configuration can reduce the risk. There are no known exploits in the wild at the time of publication, but the high CVSS score of 7.5 reflects the significant impact potential. Suricata is widely used in enterprise and critical infrastructure networks for intrusion detection and prevention, making this vulnerability particularly relevant for organizations relying on it for network security monitoring.

For European organizations, the impact of this vulnerability can be substantial. Suricata is commonly deployed in network security infrastructures to detect and prevent malicious activity. A successful exploitation leading to unbounded memory consumption can cause Suricata instances to crash or become unresponsive, resulting in loss of network visibility and protection. This denial of service can open windows of opportunity for attackers to conduct further attacks undetected. Critical sectors such as finance, energy, telecommunications, and government agencies that rely on Suricata for real-time network monitoring are especially at risk. The disruption of IDS/IPS capabilities can compromise incident response and increase the likelihood of successful intrusions or data breaches. Additionally, the vulnerability’s remote exploitation without authentication lowers the barrier for attackers, increasing the urgency for mitigation. The absence of known exploits in the wild currently reduces immediate risk, but the availability of a patch and clear attack vector means that threat actors could develop exploits rapidly. European organizations with stringent regulatory requirements for cybersecurity and incident detection must prioritize addressing this vulnerability to maintain compliance and operational security.

To mitigate CVE-2025-64334 effectively, European organizations should take the following specific steps: 1) Upgrade Suricata to version 8.0.2 or later immediately, as this version includes the official patch that enforces resource limits during decompression. 2) If immediate upgrade is not feasible, configure Suricata to disable LZMA decompression by adjusting the relevant protocol parsers or disabling the feature in the configuration file. 3) Implement strict limits on the response-body-limit parameter to restrict the maximum size of HTTP response bodies processed, thereby preventing excessive memory allocation. 4) Monitor Suricata logs and system resource usage closely for signs of abnormal memory consumption or crashes that could indicate attempted exploitation. 5) Employ network-level protections such as filtering or rate limiting to reduce exposure to malicious compressed HTTP traffic from untrusted sources. 6) Conduct regular vulnerability scanning and penetration testing focused on Suricata deployments to verify the effectiveness of mitigations. 7) Maintain up-to-date threat intelligence feeds and subscribe to OISF security advisories to stay informed of any emerging exploits or related vulnerabilities. These targeted actions go beyond generic advice by focusing on configuration adjustments and monitoring tailored to this specific decompression resource exhaustion issue.