Vulnerability identifier: #VU11338
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:
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 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(2.12.1a)T0, 15.6(2.3)T, 15.6(2)T0.1, 15.5(3)M2.1, 15.4(3)M6 or 15.4(1)IA1.102.
Vulnerable software versions
Cisco IOS XE: 15.3.0.0.19 SY - 15.6.1.22 T
External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-slogin
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.