Cisco has alerted its customers to critical vulnerabilities in the web-based management interface of its Small Business 100, 300, and 500 Series Wireless Access Points (APs).
These flaws could allow an authenticated, remote attacker to perform command injection and buffer overflow attacks.
The vulnerabilities, identified as CVE-2024-20335 and CVE-2024-20336, are particularly concerning because they could enable an attacker with administrative credentials to execute arbitrary code as the root user on the underlying operating system of the affected devices.
This could lead to a complete compromise of the wireless access points, allowing attackers to intercept, manipulate, or disrupt network traffic.
CVE-2024-20335: Cisco Small Business 100, 300, and 500 Series Wireless APs Command Injection Vulnerability
An authenticated remote attacker may be able to carry out command injection attacks against a device that is affected by a vulnerability that exists in the web-based management interface of Cisco Small Business 100, 300, and 500 Series Wireless Access Points.
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The attacker must possess legitimate administrator credentials for the connected device to take advantage of this vulnerability.
CVE-2024-20336:Cisco Small Business 100, 300, and 500 Series Wireless APs Buffer Overflow Vulnerability
A weakness in the web-based user interface of Cisco Small Business 100, 300, and 500 Series Wireless APs could make it possible for an authenticated remote attacker to carry out buffer overflow attacks against a vulnerable device.
The attacker must possess legitimate administrator credentials for the connected device to take advantage of this vulnerability.
Recommendations for Affected Users
Users of the affected Cisco Small Business Wireless APs are advised to take immediate action to reduce the risk of exploitation.
Since no patches will be provided for these vulnerabilities, replacing the affected devices is the only secure course of action.
Cisco has issued end-of-life announcements for the impacted products, urging customers to transition to newer models that will continue to receive security updates and support.
Table of Affected and Fixed Versions
| Affected Product Series | Affected Firmware Releases | Fixed Version |
| Cisco Small Business 100 Series APs | All releases | Migrate to Cisco Business Access Point Series |
| Cisco Small Business 300 Series APs | All releases | Migrate to Cisco Business Access Point Series |
| Cisco Small Business 500 Series APs | All releases | Migrate to Cisco Business Access Point Series |
Security Advisory Details
The vulnerabilities are independent of each other, meaning that the exploitation of one does not necessitate or facilitate the exploitation of the other.
The command injection vulnerability (CVE-2024-20335) and the buffer overflow vulnerability (CVE-2024-20336) both have a Security Impact Rating (SIR) of Medium and a Common Vulnerability Scoring System (CVSS) Base Score of 6.5.
The discovery of these vulnerabilities underscores the importance of maintaining up-to-date and supported hardware within network infrastructures.
Cisco’s advisories and the end-of-life process for outdated products remind businesses to regularly review and update their network components.
Customers affected by these vulnerabilities should consult Cisco’s advisories and contact the Cisco Technical Assistance Center (TAC) or their maintenance providers for guidance on migrating to supported devices.
The Cisco PSIRT has not been made aware of any public announcements or malicious use of these vulnerabilities, but given the severity of the flaws, affected users should not delay in taking appropriate action to secure their networks.
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