Denial of service in Cisco IOS and IOS XE

1) Resource management error

EUVDB-ID: #VU51770

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-1377

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to Address Resolution Protocol (ARP) entries are mismanaged. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS: 15.5.1.0.1 SY5

Cisco IOS XE: 15.5.1.0.1 SY5

Cisco 1100 Series Industrial Integrated Services Routers: All versions

Cisco Catalyst 9400 Series Switches: All versions

Cisco Catalyst 9500 Series Switches: All versions

Cisco Catalyst 9300 Series Switches: All versions

Cisco 1000 Series Integrated Services Routers: All versions

Cisco 4000 Series Integrated Services Routers: All versions

Cisco Catalyst 3650 Series Switches: All versions

Cisco Catalyst 3850 Series Switches: All versions

Cisco Cloud Services Router 1000V Series: All versions

Cisco ASR 1000 Series Aggregation Services Routers: All versions

Cisco 2600 Series Multiservice Platforms: All versions

Cisco Catalyst 9200 Series Switches: All versions

Cisco Catalyst 9600 Series Switches: All versions

Cisco Catalyst 9800 Series Wireless Controllers: All versions

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_ios:15.5.1.0.1_SY5:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios_xe:15.5.1.0.1_SY5:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_1100_series_industrial_integrated_services_routers:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_catalyst_9400_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_catalyst_9500_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_catalyst_9300_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_1000_series_integrated_services_routers:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_4000_series_integrated_services_routers:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_catalyst_3650_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_catalyst_3850_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_cloud_services_router_1000v_series:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_asr_1000_series_aggregation_services_routers:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_2600_series_multiservice_platforms:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_catalyst_9200_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_catalyst_9600_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_catalyst_9800_series_wireless_controllers:*:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-arp-mtfhBfjE

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.