Vulnerability identifier: #VU80769

Vulnerability risk: Medium

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-20190

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

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

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to incorrect destination address range encoding in the compression module in the classic access control list (ACL) compression feature. A remote attacker can bypass configured ACL protections and access trusted networks that the device might be protecting.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XR: 7.2.0 - 7.9

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-comp3acl-vGmp6BQ3

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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.