CVE-2021-1625

published 2021-09-23

CVE-2021-1625: A vulnerability in the Zone-Based Policy Firewall feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to prevent the Zone-Based…

Priority P4 32 medium 5.8 CVSS 3.1

AV N AC L PR N UI N S C C N I L A N

A vulnerability in the Zone-Based Policy Firewall feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to prevent the Zone-Based Policy Firewall from correctly classifying traffic. This vulnerability exists because ICMP and UDP responder-to-initiator flows are not inspected when the Zone-Based Policy Firewall has either Unified Threat Defense (UTD) or Application Quality of Experience (AppQoE) configured. An attacker could exploit this vulnerability by attempting to send UDP or ICMP flows through the network. A successful exploit could allow the attacker to inject traffic through the Zone-Based Policy Firewall, resulting in traffic being dropped because it is incorrectly classified or in incorrect reporting figures being produced by high-speed logging (HSL).

Affected

3 ranges

Vendor	Product	Version range	Fixed in
cisco	cisco_ios_xe_software	—	—
cisco	ios_xe	< 17.3.2	17.3.2
cisco	ios_xe	—	—

CVSS provenance

nvd v3.1 5.8 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

nvd v2.0 4.3 MEDIUM AV:N/AC:M/Au:N/C:N/I:P/A:N

vendor_cisco 5.8 MEDIUM

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CWE-284