CVE-2021-34739 Cisco Small Business Series Switches Session Credentials Replay Vulnerability
An attacker can replay intercepted session credentials to gain unauthorized administrator access to the web management interface of Cisco Small Business switches.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-34739?
CVE-2021-34739 is a high-severity authentication bypass vulnerability in Cisco Small Business Smart and Managed Switches, published on 4 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-613
Which versions are affected by CVE-2021-34739?
It affects 209 products.
Products include Cisco Cbs250-16p-2g Firmware, Cisco Cbs250-16t-2g Firmware, Cisco Cbs250-24fp-4g Firmware, Cisco Cbs250-24fp-4x Firmware, Cisco Cbs250-24p-4g Firmware, Cisco Cbs250-24p-4x Firmware and 203 more.
How do I fix CVE-2021-34739?
No fix has been published for CVE-2021-34739 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2021-34739 being exploited?
There is no known exploitation of CVE-2021-34739 in the wild and no public exploit code.
Other vulnerabilities in Cisco Small Business Smart and Managed Switches
Sources
Also known as GHSA-5fmw-qrmv-x2mw.