Platform
cisco
Component
cisco-application-services-engine
CVE-2021-1396 represents a critical remote code execution (RCE) vulnerability affecting Cisco Application Services Engine. A successful exploit could grant an attacker privileged access to the underlying host, enabling them to execute arbitrary commands and potentially compromise the entire system. This vulnerability impacts versions prior to a fixed release, and Cisco has advised users to upgrade as soon as possible.
The impact of CVE-2021-1396 is severe due to the potential for complete system compromise. An unauthenticated attacker, meaning no prior authentication is required, can exploit this vulnerability to execute arbitrary code on the Cisco Application Services Engine host. This could lead to data exfiltration, denial of service, and the installation of persistent malware. The ability to create diagnostic files also presents a risk of information disclosure, potentially revealing sensitive configuration details or internal system data. The lack of authentication significantly broadens the attack surface, making this vulnerability particularly dangerous.
CVE-2021-1396 is considered a high-priority vulnerability due to its critical CVSS score and the ease of exploitation (unauthenticated remote access). Public proof-of-concept exploits are likely to emerge, increasing the risk of widespread exploitation. While no active campaigns have been publicly confirmed at the time of writing, the vulnerability's severity warrants immediate attention. It was disclosed on February 24, 2021.
Exploit Status
EPSS
0.83% (74% percentile)
CVSS Vector
Due to the lack of a fixed version provided, immediate mitigation focuses on reducing the attack surface. Network segmentation should be implemented to isolate the Cisco Application Services Engine from other critical systems, limiting the potential blast radius of a successful exploit. Strict access controls, including multi-factor authentication where possible, should be enforced to restrict access to the device. Monitor network traffic for suspicious activity targeting the Application Services Engine, particularly attempts to access diagnostic or configuration endpoints. Consider implementing a Web Application Firewall (WAF) with rules to block known attack patterns associated with RCE vulnerabilities. Regularly review and harden the configuration of the Application Services Engine to minimize potential attack vectors.
Update Cisco Application Services Engine to a version that is not vulnerable. See the Cisco advisory for more details and specific upgrade instructions.
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CVE-2021-1396 is a critical remote code execution vulnerability in Cisco Application Services Engine allowing unauthenticated attackers to gain privileged access and execute commands. It has a CVSS score of 9.8.
You are affected if you are running Cisco Application Services Engine prior to a fixed version. Check your current version against Cisco's advisory for confirmation.
Upgrade to a fixed version of Cisco Application Services Engine as soon as it becomes available. Until then, implement network segmentation and strict access controls as mitigations.
While no active campaigns have been publicly confirmed, the vulnerability's severity warrants immediate attention and the likelihood of exploitation is high.
Refer to the official Cisco Security Advisory for detailed information and mitigation guidance: https://cisco.com/c/en/us/products/security/center/content/cisco-security-advisories/cisco-sa-appservicesengine-multiple-vulnerabilities.html
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