CVE-2021-1377

Severity

57%

Complexity

39%

Confidentiality

23%

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.

CVSS 3.1 Base Score 5.8. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L).

CVSS 2.0 Base Score 5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P).

Overview

Type

Cisco IOS

First reported 3 years ago

2021-03-24 20:15:00

Last updated 3 years ago

2021-03-29 20:13:00

Affected Software

Cisco IOS 12.2(6)I1

12.2\(6\)i1

Cisco IOS 15.1(3)SVS

15.1\(3\)svs

Cisco IOS 15.2(2)E6

15.2\(2\)e6

Cisco IOS 15.2(2)E7

15.2\(2\)e7

Cisco IOS 15.2(2)E7B

15.2\(2\)e7b

Cisco IOS 15.2(2)E8

15.2\(2\)e8

Cisco IOS 15.2(2)E9

15.2\(2\)e9

Cisco IOS 15.2(2)E9A

15.2\(2\)e9a

Cisco IOS 15.2(2)E10

15.2\(2\)e10

Cisco IOS 15.2(3)E5

15.2\(3\)e5

Cisco IOS 15.2(4)E4

15.2\(4\)e4

Cisco IOS 15.2(4)E5

15.2\(4\)e5

Cisco IOS 15.2(4)E5A

15.2\(4\)e5a

Cisco IOS 15.2(4)E6

15.2\(4\)e6

Cisco IOS 15.2(4)E7

15.2\(4\)e7

Cisco IOS 15.2(4)E8

15.2\(4\)e8

Cisco IOS 15.2(4)E9

15.2\(4\)e9

Cisco IOS 15.2(4)E10

15.2\(4\)e10

Cisco IOS 15.2(4)EA6

15.2\(4\)ea6

Cisco IOS 15.2(4)EA7

15.2\(4\)ea7

Cisco IOS 15.2(4)EA8

15.2\(4\)ea8

Cisco IOS 15.2(4)EA9

15.2\(4\)ea9

Cisco IOS 15.2(5)E1

15.2\(5\)e1

Cisco IOS 15.2(5)E2

15.2\(5\)e2

Cisco IOS 15.2(5)E2C

15.2\(5\)e2c

Cisco IOS 15.2(5)EX

15.2\(5\)ex

Cisco IOS 15.2(5A)E1

15.2\(5a\)e1

Cisco IOS 15.2(6)E

15.2\(6\)e

Cisco IOS 15.2(6)E0A

15.2\(6\)e0a

Cisco IOS 15.2(6)E0C

15.2\(6\)e0c

Cisco IOS 15.2(6)E1

15.2\(6\)e1

Cisco IOS 15.2(6)E1A

15.2\(6\)e1a

Cisco IOS 15.2(6)E1S

15.2\(6\)e1s

Cisco IOS 15.2(6)E2

15.2\(6\)e2

Cisco IOS 15.2(6)E2A

15.2\(6\)e2a

Cisco IOS 15.2(6)E2B

15.2\(6\)e2b

Cisco IOS 15.2(6)E3

15.2\(6\)e3

Cisco IOS 15.2(6)EB

15.2\(6\)eb

Cisco IOS 15.2(7)E

15.2\(7\)e

Cisco IOS 15.2(7)E0A

15.2\(7\)e0a

Cisco IOS 15.2(7)E0B

15.2\(7\)e0b

Cisco IOS 15.2(7)E0s

15.2\(7\)e0s

Cisco IOS 15.2(7)E1

15.2\(7\)e1

Cisco IOS 15.2(7)E1A

15.2\(7\)e1a

Cisco IOS 15.2(7A)E0B

15.2\(7a\)e0b

Cisco IOS 15.2(7b)e0b

15.2\(7b\)e0b

Cisco IOS 15.4(1)SY

15.4\(1\)sy

Cisco IOS 15.4(1)SY1

15.4\(1\)sy1

Cisco IOS 15.4(1)SY2

15.4\(1\)sy2

Cisco IOS 15.4(1)SY3

15.4\(1\)sy3

Cisco IOS 15.4(1)SY4

15.4\(1\)sy4

Cisco IOS 15.5(1)SY

15.5\(1\)sy

Cisco IOS 15.5(1)SY2

15.5\(1\)sy2

Cisco IOS 15.5(1)SY3

15.5\(1\)sy3

Cisco IOS 15.5(1)SY4

15.5\(1\)sy4

Cisco IOS 15.5(3)M4

15.5\(3\)m4

Cisco IOS 15.5(3)M4B

15.5\(3\)m4b

Cisco IOS 15.5(3)M4C

15.5\(3\)m4c

Cisco IOS 15.5(3)M5

15.5\(3\)m5

Cisco IOS 15.5(3)M6

15.5\(3\)m6

Cisco IOS 15.5(3)M6A

15.5\(3\)m6a

Cisco IOS 15.5(3)M9

15.5\(3\)m9

Cisco IOS 15.5(3)M10

15.5\(3\)m10

Cisco IOS 15.5(3)S6

15.5\(3\)s6

Cisco IOS 15.5(3)S6A

15.5\(3\)s6a

Cisco IOS 15.5(3)S6B

15.5\(3\)s6b

Cisco IOS 15.5(3)S7

15.5\(3\)s7

Cisco IOS 15.5(3)S8

15.5\(3\)s8

Cisco IOS 15.5(3)S9

15.5\(3\)s9

Cisco IOS 15.5(3)S9A

15.5\(3\)s9a

Cisco IOS 15.5(3)S10

15.5\(3\)s10

Cisco IOS 15.6(3)M2

15.6\(3\)m2

Cisco IOS 15.6(3)M2A

15.6\(3\)m2a

Cisco IOS 15.6(3)M3

15.6\(3\)m3

Cisco IOS 15.6(3)M3A

15.6\(3\)m3a

Cisco IOS 15.6(3)M4

15.6\(3\)m4

Cisco IOS 15.6(3)M6

15.6\(3\)m6

Cisco IOS 15.6(3)M6A

15.6\(3\)m6a

Cisco IOS 15.7(3)M0A

15.7\(3\)m0a

Cisco IOS 15.7(3)M1

15.7\(3\)m1

Cisco IOS 15.7(3)M2

15.7\(3\)m2

Cisco IOS 15.7(3)M4

15.7\(3\)m4

Cisco IOS 15.7(3)M4A

15.7\(3\)m4a

Cisco IOS 15.7(3)M4B

15.7\(3\)m4b

Cisco IOS 15.8(3)M1

15.8\(3\)m1

Cisco IOS 15.8(3)M1A

15.8\(3\)m1a

Cisco IOS 15.8(3)M2

15.8\(3\)m2

Cisco IOS 15.8(3)M2A

15.8\(3\)m2a

Cisco IOS 15.8(3)M3A

15.8\(3\)m3a

Cisco IOS 15.8(3)M3B

15.8\(3\)m3b

Cisco IOS 15.9(3)M0A

15.9\(3\)m0a

Cisco IOS XE 3.6.6E

3.6.6e

Cisco IOS XE 3.6.7AE

3.6.7ae

Cisco IOS XE 3.6.7BE

3.6.7be

Cisco IOS XE 3.6.7E

3.6.7e

Cisco IOS XE 3.6.8E

3.6.8e

Cisco IOS XE 3.6.9AE

3.6.9ae

Cisco IOS XE 3.6.9E

3.6.9e

Cisco IOS XE 3.6.10E

3.6.10e

Cisco IOS XE 3.7.5E

3.7.5e

Cisco IOS XE 3.8.5AE

3.8.5ae

Cisco IOS XE 3.8.5E

3.8.5e

Cisco IOS XE 3.8.7E

3.8.7e

Cisco IOS XE 3.8.8E

3.8.8e

Cisco IOS XE 3.8.9E

3.8.9e

Cisco IOS XE 3.8.10E

3.8.10e

Cisco IOS XE 3.9.2BE

3.9.2be

Cisco IOS XE 3.9.2E

3.9.2e

Cisco IOS XE 3.10.0CE

3.10.0ce

Cisco IOS XE 3.10.0E

3.10.0e

Cisco IOS XE 3.10.1AE

3.10.1ae

Cisco IOS XE 3.10.1E

3.10.1e

Cisco IOS XE 3.10.1SE

3.10.1se

Cisco IOS XE 3.10.2E

3.10.2e

Cisco IOS XE 3.10.3E

3.10.3e

Cisco IOS XE 3.11.0E

3.11.0e

Cisco IOS XE 3.11.1AE

3.11.1ae

Cisco IOS XE 3.11.1E

3.11.1e

Cisco IOS XE 3.11.3E

3.11.3e

Cisco IOS XE 3.16.4CS

3.16.4cs

Cisco IOS XE 3.16.4ES

3.16.4es

Cisco IOS XE 3.16.4GS

3.16.4gs

Cisco IOS XE 3.16.5AS

3.16.5as

Cisco IOS XE 3.16.5BS

3.16.5bs

Cisco IOS XE 3.16.7AS

3.16.7as

Cisco IOS XE 3.16.7BS

3.16.7bs

Cisco IOS XE 3.16.8S

3.16.8s

Cisco IOS XE 3.16.9S

3.16.9s

Cisco IOS XE 3.16.10S

3.16.10s

Cisco IOS XE 16.3.4

16.3.4

Cisco IOS XE 16.3.5

16.3.5

Cisco IOS XE 16.3.7

16.3.7

Cisco IOS XE 16.3.8

16.3.8

Cisco IOS XE 16.4.2

16.4.2

Cisco IOS XE 16.4.3

16.4.3

Cisco IOS XE 16.5.1

16.5.1

Cisco IOS XE 16.5.1B

16.5.1b

Cisco IOS XE 16.5.2

16.5.2

Cisco IOS XE 16.5.3

16.5.3

Cisco IOS XE 16.6.4

16.6.4

Cisco IOS XE 16.6.4A

16.6.4a

Cisco IOS XE 16.6.4S

16.6.4s

Cisco IOS XE 16.6.5A

16.6.5a

Cisco IOS XE 16.6.5B

16.6.5b

Cisco IOS XE 16.6.6

16.6.6

Cisco IOS XE 16.6.7A

16.6.7a

Cisco IOS XE 16.6.8

16.6.8

Cisco IOS XE 16.7.1A

16.7.1a

Cisco IOS XE 16.7.1B

16.7.1b

Cisco IOS XE 16.7.3

16.7.3

Cisco IOS XE 16.7.4

16.7.4

Cisco IOS XE 16.8.1A

16.8.1a

Cisco IOS XE 16.8.1B

16.8.1b

Cisco IOS XE 16.8.1C

16.8.1c

Cisco IOS XE 16.8.1D

16.8.1d

Cisco IOS XE 16.8.1E

16.8.1e

Cisco IOS XE 16.8.1S

16.8.1s

Cisco IOS XE 16.8.2

16.8.2

Cisco IOS XE 16.8.3

16.8.3

Cisco IOS XE16.9.1

16.9.1

Cisco IOS XE 16.9.1A

16.9.1a

Cisco IOS XE 16.9.1B

16.9.1b

Cisco IOS XE 16.9.1C

16.9.1c

Cisco IOS XE 16.9.1D

16.9.1d

Cisco IOS XE 16.9.1S

16.9.1s

Cisco IOS XE 16.9.2

16.9.2

Cisco IOS XE 16.9.2A

16.9.2a

Cisco IOS XE 16.9.2S

16.9.2s

Cisco IOS XE 16.9.3

16.9.3

Cisco IOS XE 16.9.3A

16.9.3a

Cisco IOS XE 16.9.3H

16.9.3h

Cisco IOS XE 16.9.3S

16.9.3s

Cisco IOS XE 16.9.4C

16.9.4c

Cisco IOS XE 16.9.5

16.9.5

Cisco IOS XE 16.9.5F

16.9.5f

Cisco IOS XE 16.10.1

16.10.1

Cisco IOS XE 16.10.1A

16.10.1a

Cisco IOS XE 16.10.1B

16.10.1b

Cisco IOS XE 16.10.1C

16.10.1c

Cisco IOS XE 16.10.1D

16.10.1d

Cisco IOS XE 16.10.1E

16.10.1e

Cisco IOS XE 16.10.1F

16.10.1f

Cisco IOS XE 16.10.1G

16.10.1g

Cisco IOS XE 16.10.1S

16.10.1s

Cisco IOS XE 16.10.2

16.10.2

Cisco IOS XE 16.10.3

16.10.3

Cisco IOS XE 16.11.1

16.11.1

Cisco IOS XE 16.12.1

16.12.1

Cisco IOS XE 16.12.1Y

16.12.1y

Cisco IOS XE 16.12.2

16.12.2

Cisco IOS XE 16.12.2A

16.12.2a

Cisco IOS XE 16.12.4

16.12.4

Cisco IOS XE 17.1.1

17.1.1

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