Zero-day vulnerability in Cisco IOS XR

Improper input validation
CVE-2016-1409

Not patched

Vulnerability details

Advisory: SB20016052601 - Remote denial of service in Cisco IOS

Vulnerable component: Cisco IOS XR

CVE-ID: CVE-2016-1409

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:H/RL:U/RC:C

CWE-ID: CWE-20 - Improper input validation

Description:

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to a logic error when parsing IPv6 Neighbor Discovery (ND) packets, sent directly to the device. A remote attacker can send specially crafted IPv6 traffic to the affected device and cause the device to stop processing IPv6 traffic.

Successful exploitation of the vulnerability will result in denial of service attack.

Note: according to Cisco, this vulnerability is being exploited in the wild.

External links:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160525-ipv6

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.