CVE-2021-44527 describes a medium-severity vulnerability found in UniFi Switch firmware versions 5.43.35 and earlier. This vulnerability allows a malicious actor who has already gained access to the network to perform a Denial of Service (DoS) attack on the affected switch. The risk to organizations includes potential service disruptions resulting from the exploitation of this vulnerability. It is critical to address this vulnerability as it can lead to significant operational impacts. Organizations should prioritize patching immediately, as the vulnerability has been fixed in UniFi Switch firmware version 5.76.6 and later.
The exploitation status for CVE-2021-44527 shows that there is no known public exploit available. However, the nature of the vulnerability, which is a Denial of Service, could be leveraged by attackers with network access. The urgency for patching is heightened by the fact that the vulnerability is medium severity with a CVSS score of 6.5, indicating a potential for high availability impact.
To mitigate this risk, organizations must ensure that their UniFi Switch firmware is upgraded to version 5.76.6 or later. Regular monitoring and maintenance of firmware versions are also recommended to avoid falling victim to similar vulnerabilities in the future.
In conclusion, CVE-2021-44527 represents a significant risk to organizations using affected UniFi Switch firmware. Immediate action is necessary to remediate this vulnerability and protect network infrastructure from potential disruptions.
Vulnerability Details
The official description of CVE-2021-44527 states that it allows a malicious actor who has gained network access to perform a Denial of Service (DoS) attack on the affected switch. The vulnerability is classified under CWE-400 and has a CVSS score of 6.5, indicating a medium severity. The affected product is the UniFi Switch firmware, specifically versions 5.43.35 and earlier, with the vulnerability fixed in version 5.76.6. The vulnerability was published on December 7, 2021.
Technical Analysis
The root cause of this vulnerability lies in the implementation of the UniFi Switch firmware, which allows an attacker with network access to disrupt the normal functioning of the device. The attack vector is classified as 'Adjacent Network', indicating that an attacker must be connected to the same network as the vulnerable device. The attack complexity is low, as no special conditions or privileges are required for exploitation. Furthermore, no user interaction is needed for the attack to succeed.
The impacts on confidentiality and integrity are negligible, as this vulnerability primarily affects availability. The availability impact is rated as high, meaning that the switch can be rendered inoperative, affecting network services relying on it.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2021-44527 is significant, particularly for organizations that rely on UniFi Switches for network operations. The potential blast radius includes any services and applications that depend on the availability of the affected switch. Given the medium CVSS score, organizations should prioritize this vulnerability within their patch management cycle, particularly due to the associated high availability impact.
Organizations should assess their network architecture to understand the potential impact of a DoS attack on their services. The urgency assessment is medium, suggesting that while it is not an immediate crisis, organizations should address it promptly to avoid service disruptions.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of the UniFi Switch firmware are all versions prior to 5.76.6. Organizations should ensure they upgrade to this version to mitigate the risk associated with CVE-2021-44527.
Mitigation & Remediation
To mitigate this vulnerability, it is critical for organizations to upgrade their UniFi Switch firmware to version 5.76.6 or later. If immediate patching is not possible, consider implementing network segmentation to limit access to the affected devices and monitor network traffic for any unusual activity. Regularly review firmware versions to ensure compliance with security best practices and maintain organizational resilience against similar vulnerabilities.
Organizations should validate remediation effectiveness through penetration testing to identify similar weaknesses.
Detection Guidance
Organizations should monitor logs for indicators of abnormal traffic patterns, especially traffic directed at the UniFi Switch. Behavioral anomalies such as sudden increases in traffic volume or repeated access attempts should be investigated. Additionally, network signatures can be employed to detect attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-44527 highlights the importance of maintaining up-to-date firmware and security protocols for network devices. This vulnerability serves as a reminder of the potential risks associated with network accessibility and the necessity for robust security measures. Security teams should learn from this incident, ensuring that routine checks and updates are part of their operational strategies.
Organizations can benefit from continuous security assessments, such as offensive security testing, to proactively identify and address vulnerabilities.
Incorporating strategies such as continuous penetration testing is essential to staying ahead of emerging threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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