Vulnerability identifier: #VU7369

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-6729

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco ASR 5000 Series
Hardware solutions / Firmware

Vendor: Cisco Systems, Inc

Description
The vulnerability allows a remote unauthenticated attacker to cause DoS condition.

The weakness exists in the Border Gateway Protocol (BGP) processing functionality of the Cisco StarOS operating system for Cisco ASR 5000 Series Routers and Cisco Virtualized Packet Core (VPC) Software due to improper boundary controls for the BGP peering sessions list. A remote attacker can send specially crafted TCP packets to an IPv4 or IPv6 interface and cause the BGP process to reload.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
The vulnerability is addressed in the following versions:
21.3.A0.65902, 21.2.A0.65905, 21.1.b0.66164, 21.1.V0.66014, 21.1.R0.65898, 21.1.M0.65894, 21.1.0.66030, 21.1.0.

Vulnerable software versions

Cisco ASR 5000 Series: 16.4.1 - 21.1.M0.65824

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170705-staros

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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?

No. We are not aware of malware exploiting this vulnerability.