CVE-2021-1445 : What You Need to Know

Multiple vulnerabilities in Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software have been identified, potentially allowing an unauthenticated remote attacker to trigger a denial of service (DoS) condition on affected devices due to improper input validation of HTTPS requests.

Understanding CVE-2021-1445

This CVE involves a significant vulnerability in Cisco ASA Software and FTD Software that could lead to DoS attacks by exploiting HTTPS requests.

What is CVE-2021-1445?

CVE-2021-1445 refers to multiple vulnerabilities in Cisco ASA Software and FTD Software that could be exploited by unauthenticated remote attackers to cause a DoS condition by sending specially crafted HTTPS requests.

The Impact of CVE-2021-1445

The impact of this vulnerability is rated as HIGH with a base score of 8.6. If successfully exploited, it could result in a denial of service condition on the affected devices, particularly those using specific AnyConnect and WebVPN configurations.

Technical Details of CVE-2021-1445

This section provides insights into the vulnerability description, affected systems, versions, and the exploitation mechanism.

Vulnerability Description

The vulnerabilities in Cisco ASA Software and FTD Software are a result of inadequate input validation of HTTPS requests, allowing attackers to send crafted requests to trigger a DoS condition by causing the affected devices to reload.

Affected Systems and Versions

The vulnerable systems include specific configurations of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software, impacting devices with corresponding AnyConnect and WebVPN setups.

Exploitation Mechanism

Attackers can exploit these vulnerabilities by sending malicious HTTPS requests to affected devices, leveraging the lack of proper input validation to force device reloads and induce a DoS condition.

Mitigation and Prevention

Safeguard affected systems by following immediate steps and implementing long-term security practices along with timely patching and updates.

Immediate Steps to Take

Organizations should apply relevant security patches from Cisco to address the vulnerabilities and avoid potential attacks exploiting CVE-2021-1445.

Long-Term Security Practices

Enhance network security measures, including access controls, monitoring, and regular security assessments to mitigate risks of DoS attacks and other security breaches.

Patching and Updates

Regularly monitor security advisories from Cisco and apply patches promptly to ensure the protection of systems against known vulnerabilities.