Vulnerability identifier: #VU48163

Vulnerability risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-3444

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco IOS XE
Operating systems & Components / Operating system
Cisco IOS XE SD-WAN
Other software / Other software solutions

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to bypass L3 and L4 traffic filters.

The vulnerability exists due to improper traffic filtering conditions on an affected device. A remote attacker can send a specially crafted TCP packet, bypass the L3 and L4 traffic filters and inject an arbitrary packet into the network. 

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Cisco IOS XE: 17.2.1

Cisco IOS XE SD-WAN: 16.12.2r

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cedge-filt-bypass-Y6wZMqm4

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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.