Vulnerability in Cisco iOS
CVE-2021-1377
A vulnerability in Address Resolution Protocol (ARP) management of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to prevent an affected device from resolving ARP entries for legitimate hosts on the connected subnets. This vulnerability exists because ARP entries are mismanaged. An attacker could exploit this vulnerability by continuously sending traffic that results in incomplete ARP entries. A successful exploit could allow the attacker to cause ARP requests on the device to be unsuccessful for legitimate hosts, resulting in a denial of service (DoS) condition.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.015 (73.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.015 · change: +0.001
Affected products
- Cisco iOS
- Cisco iOS — versions 15.5\(3\)m7, 15.2\(4\)e4, 15.2(7)e2
- Cisco iOS Xe — versions 3.6.6e, 3.6.7ae, 3.6.7be
Weakness classification (CWE)
References
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-arp-mtfh… (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-1377?
- CVE-2021-1377 is a medium-severity vulnerability in Cisco iOS, classified under CWE-399. CVSS score: 5.8/10. Published 2021-03-24.
- How severe is CVE-2021-1377?
- Medium severity. CVSS v3 base score is 5.8 out of 10.