Vulnerability in Cisco 1000 Integrated Services Router
CVE-2021-1621
A vulnerability in the Layer 2 punt code of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a queue wedge on an interface that receives specific Layer 2 frames, resulting in a denial of service (DoS) condition. This vulnerability is due to improper handling of certain Layer 2 frames. An attacker could exploit this vulnerability by sending specific Layer 2 frames on the segment the router is connected to. A successful exploit could allow the attacker to cause a queue wedge on the interface, resulting in a DoS condition.
EPSS: 0.004 (29.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
Affected products
- Cisco 1000_integrated_services_router
- Cisco 1100-4g\/6g_integrated_services_router
- Cisco 1100-4p_integrated_services_router
- Cisco 1100-8p_integrated_services_router
- Cisco 1100_integrated_services_router
- Cisco 1101-4p_integrated_services_router
- Cisco 1101_integrated_services_router
- Cisco 1109-2p_integrated_services_router
- Cisco 1109-4p_integrated_services_router
- Cisco 1109_integrated_services_router
Weakness classification (CWE)
References
- psirt@cisco.com (x_refsource_CISCO, vendor-advisory, Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-1621?
- CVE-2021-1621 is a high-severity vulnerability in Cisco 1000 Integrated Services Router, classified under CWE-399. CVSS score: 7.4/10. Published 2021-09-23.
- How severe is CVE-2021-1621?
- High severity. CVSS v3 base score is 7.4 out of 10.