CVE-2017-3878 Denial of service in Cisco Nexus 9000 Series Switches
Unauthenticated remote attackers can crash the Telnet login process on Cisco Nexus switches, preventing legitimate logins without affecting data traffic.
- 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-2017-3878?
CVE-2017-3878 is a medium-severity denial of service vulnerability in Cisco Nx-Os, published on 17 Mar 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A Denial of Service vulnerability in the Telnet remote login functionality of Cisco NX-OS Software running on Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to cause a Telnet process used for login to terminate unexpectedly and the login attempt to fail. There is no impact to user traffic flowing through the device. Affected Products: This vulnerability affects Cisco Nexus 9000 Series Switches that are running Cisco NX-OS Software and are configured to allow remote Telnet connections to the device. More Information: CSCux46778. Known Affected Releases: 7.0(3)I3(0.170). Known Fixed Releases: 7.0(3)I3(1) 7.0(3)I3(0.257) 7.0(3)I3(0.255) 7.0(3)I2(2e) 7.0(3)F1(1.22) 7.0(3)F1(1).
Weakness: CWE-119
Which versions are affected by CVE-2017-3878?
It affects 1 product.
Products include Cisco Nx-Os.
How do I fix CVE-2017-3878?
No fix has been published for CVE-2017-3878 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2017-3878 being exploited?
There is no known exploitation of CVE-2017-3878 in the wild and no public exploit code.
Other vulnerabilities in Cisco Nx-Os
Sources
Also known as GHSA-f862-pggf-w7pj.