Multiple Cisco products are affected by a vulnerability in the processing of DCE/RPC requests that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to leak sensitive information or to restart, resulting in an interruption of packet inspection. This vulnerability is due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer use-after-free read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3. A successful exploit could allow the attacker to unexpectedly restart the Snort 3 Detection Engine, which could cause a denial of service (DoS).
Vulnerability Details
The CVE-2026-20026 vulnerability has a CVSS score of 5.8, indicating a medium severity level. This score reflects the potential impact of the vulnerability, specifically in terms of availability, as it could lead to a denial of service. The vulnerability is classified under CWE-415, which refers to a use-after-free condition.
Technical Analysis
The root cause of this vulnerability lies in the improper handling of DCE/RPC requests within the Snort 3 Detection Engine. Attackers may leverage this vulnerability by sending a series of crafted DCE/RPC requests that exploit the buffer handling logic. The attack vector is primarily network-based, requiring no privileges or user interaction to execute.
The attack complexity is considered low, as the exploitation can be performed by any unauthenticated user with access to the network segment where Snort 3 is deployed. The availability impact is rated as low, indicating that successful exploitation could lead to an interruption of service, but does not compromise the confidentiality or integrity of data.
Risk & Impact Analysis
Risk to organizations includes potential service interruptions that could disrupt network monitoring and threat detection processes. Given the nature of the vulnerability, the blast radius could be significant, especially in environments relying heavily on Snort 3 for intrusion detection. Organizations should address this vulnerability in their priority patch cycle, as it poses a medium risk to network availability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch are affected by this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching immediately. Ensure you are using the latest version of the Snort 3 Detection Engine to mitigate this vulnerability. For more in-depth security validation, consider engaging in penetration testing services to identify and rectify any potential weaknesses in your network.
Detection Guidance
Monitor logs for anomalies related to DCE/RPC request handling and any unexpected restarts of the Snort 3 Detection Engine. Behavioral signatures indicative of this vulnerability should be established to enhance detection capabilities.
AppSecure Threat Intelligence Insight
The vulnerabilities represented by CVE-2026-20026 highlight ongoing issues in buffer handling within network security applications. Security teams should learn from this incident to refine their approaches in vulnerability management and threat detection. Additionally, organizations should consider enhancing their incident response strategies to address similar vulnerabilities proactively.
For further reading on vulnerability management, refer to our article on vulnerability management programs, and for insights on penetration testing methodologies, see our guide on penetration testing methodologies.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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