CVE-2021-1501 Explained : Impact and Mitigation
Learn about CVE-2021-1501, a vulnerability in Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software that allows remote attackers to cause a crash and denial of service.
A vulnerability in the SIP inspection engine of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a crash and reload of an affected device, resulting in a denial of service (DoS) condition.
Understanding CVE-2021-1501
This CVE relates to a vulnerability in the SIP inspection engine of Cisco ASA Software and FTD Software that could lead to a DoS condition.
What is CVE-2021-1501?
The vulnerability in the SIP inspection engine allows remote attackers to send crafted SIP traffic to cause a crash and reload of vulnerable devices.
The Impact of CVE-2021-1501
Exploiting this vulnerability can result in a denial of service (DoS) condition, affecting the availability of the impacted device.
Technical Details of CVE-2021-1501
The following technical details outline the vulnerability.
Vulnerability Description
The vulnerability is caused by a crash during a hash lookup for a SIP pinhole connection, triggered by sending malicious SIP traffic through the target device.
Affected Systems and Versions
Affected systems include Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software with specific versions.
Exploitation Mechanism
Remote attackers can exploit this vulnerability by sending specially crafted SIP traffic through the vulnerable device to cause a crash and reload.
Mitigation and Prevention
Taking immediate steps and implementing long-term security practices can help mitigate the risks associated with CVE-2021-1501.
Immediate Steps to Take
It's crucial to apply patches or updates provided by Cisco to address this vulnerability promptly.
Long-Term Security Practices
Ensure network security measures and access controls are in place to prevent unauthorized access and mitigate similar vulnerabilities in the future.
Patching and Updates
Regularly check for security advisories and updates from Cisco to stay protected against known vulnerabilities.