CVE-2021-34739
8.1 · HIGHOverview
CVE-2021-34739 is a high-severity vulnerability affecting cisco sf250-24_firmware. It was published on November 4, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
A vulnerability in the web-based management interface of multiple Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to replay valid user session credentials and gain unauthorized access to the web-based management interface of an affected device. This vulnerability is due to insufficient expiration of session credentials. An attacker could exploit this vulnerability by conducting a man-in-the-middle attack against an affected device to intercept valid session credentials and then replaying the intercepted credentials toward the same device at a later time. A successful exploit could allow the attacker to access the web-based management interface with administrator privileges.
Remediation
Check the references section for vendor advisories and patches from cisco. Update sf250-24_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| cisco | sf250-24_firmware | 0 | Affected |
| cisco | sf250-24p_firmware | 0 | Affected |
| cisco | sf250-48_firmware | 0 | Affected |
| cisco | sf250-48hp_firmware | 0 | Affected |
| cisco | sf250-08_firmware | 0 | Affected |
| cisco | sf250-08hp_firmware | 0 | Affected |
| cisco | sf250-10p_firmware | 0 | Affected |
| cisco | sf250-18_firmware | 0 | Affected |
| cisco | sf250-26_firmware | 0 | Affected |
| cisco | sf250-26hp_firmware | 0 | Affected |
Frequently Asked Questions
What is CVE-2021-34739?
CVE-2021-34739 is a high-severity vulnerability affecting cisco sf250-24_firmware. It was published on November 4, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2021-34739?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-34739?
Check the references section for vendor advisories and patches from cisco. Update sf250-24_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-34739?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-34739 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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