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CVE-2021-1377

MEDIUMCVSS 5.8/10EPSS 1.43%

Last modified

CVE-2021-1377 is a medium-severity vulnerability rated 5.8/10 on the CVSS scale. 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. EPSS estimates a 1.43% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
5.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

EPSS Probability
1.43%

69.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoIos12.2\(6\)i1
CiscoIos15.1\(3\)svr1
CiscoIos15.1\(3\)svr2
CiscoIos15.1\(3\)svr3
CiscoIos15.1\(3\)svs
CiscoIos15.1\(3\)svs1
CiscoIos15.2\(2\)e6
CiscoIos15.2\(2\)e7
CiscoIos15.2\(2\)e7b
CiscoIos15.2\(2\)e8
CiscoIos15.2\(2\)e9
CiscoIos15.2\(2\)e9a
CiscoIos15.2\(2\)e10
CiscoIos15.2\(3\)e5
CiscoIos15.2\(4\)e4
CiscoIos15.2\(4\)e5
CiscoIos15.2\(4\)e5a
CiscoIos15.2\(4\)e6
CiscoIos15.2\(4\)e7
CiscoIos15.2\(4\)e8
CiscoIos15.2\(4\)e9
CiscoIos15.2\(4\)e10
CiscoIos15.2\(4\)e10a
CiscoIos15.2\(4\)ea6
CiscoIos15.2\(4\)ea7
CiscoIos15.2\(4\)ea8
CiscoIos15.2\(4\)ea9
CiscoIos15.2\(4\)ea9a
CiscoIos15.2\(4\)ea10
CiscoIos15.2\(5\)e1
CiscoIos15.2\(5\)e2
CiscoIos15.2\(5\)e2b
CiscoIos15.2\(5\)e2c
CiscoIos15.2\(5\)ex
CiscoIos15.2\(5a\)e1
CiscoIos15.2\(6\)e
CiscoIos15.2\(6\)e0a
CiscoIos15.2\(6\)e0c
CiscoIos15.2\(6\)e1
CiscoIos15.2\(6\)e1a
CiscoIos15.2\(6\)e1s
CiscoIos15.2\(6\)e2
CiscoIos15.2\(6\)e2a
CiscoIos15.2\(6\)e2b
CiscoIos15.2\(6\)e3
CiscoIos15.2\(6\)eb
CiscoIos15.2\(7\)e
CiscoIos15.2\(7\)e0a
CiscoIos15.2\(7\)e0b
CiscoIos15.2\(7\)e0s

Showing 50 of 302 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2021-1377?
CVE-2021-1377 has a CVSS score of 5.8/10 (MEDIUM severity). The EPSS model estimates a 1.43% probability of exploitation in the next 30 days.
How do I fix CVE-2021-1377?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-1377?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST