Vulnerability identifier: #VU11339

Vulnerability risk: Medium

CVSSv3.1: 8.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2018-0180

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco IOS XE
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description
The vulnerability allows a remote unauthenticated attacker to cause DoS condition on the target system.

The weakness exists due to an attempt to free an area of memory that has not been previously allocated. A remote attacker can attempt to log in via Secure Shell (SSH) or Telnet with invalid credentials multiple times while the administrator modifies the login block-for configuration and cause the service to crash.

Mitigation
Update to versions 15.7(3.1.8A)OT, 15.7(3.1.4A)OT, 15.6(3)M, 15.6(2.19)T, 15.6(2.0.1a)T0, 15.5(3)M6 or 15.4(3)M6.

Vulnerable software versions

Cisco IOS XE: 15.3.0.0.19 SY - 15.4.3 M4.1

---

External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-slogin

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.