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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (29.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
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
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-quewedge… (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.