7.7
CVSSv3

CVE-2021-1620

Published: 23/09/2021 Updated: 07/11/2023
CVSS v2 Base Score: 3.5 | Impact Score: 2.9 | Exploitability Score: 6.8
CVSS v3 Base Score: 7.7 | Impact Score: 4 | Exploitability Score: 3.1
VMScore: 312
Vector: AV:N/AC:M/Au:S/C:N/I:N/A:P

Vulnerability Summary

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) support for the AutoReconnect feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote malicious user to exhaust the free IP addresses from the assigned local pool. This vulnerability occurs because the code does not release the allocated IP address under certain failure conditions. An attacker could exploit this vulnerability by trying to connect to the device with a non-AnyConnect client. A successful exploit could allow the malicious user to exhaust the IP addresses from the assigned local pool, which prevents users from logging in and leads to a denial of service (DoS) condition.

Vulnerability Trend

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cisco ios_xe

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cisco ios_xe 3.16.3s

cisco ios_xe 3.16.4as

cisco ios_xe 3.16.4bs

cisco ios_xe 3.16.4cs

cisco ios_xe 3.16.4ds

cisco ios_xe 3.16.4es

cisco ios_xe 3.16.4gs

cisco ios_xe 3.16.4s

cisco ios_xe 3.16.5as

cisco ios_xe 3.16.5bs

cisco ios_xe 3.16.5s

cisco ios_xe 3.16.6bs

cisco ios_xe 3.16.6s

cisco ios_xe 3.16.7as

cisco ios_xe 3.16.7bs

cisco ios_xe 3.16.7s

cisco ios_xe 3.16.8s

cisco ios_xe 3.16.9s

cisco ios_xe 3.16.10as

cisco ios_xe 3.16.10bs

cisco ios_xe 3.16.10s

cisco ios_xe 3.17.0s

cisco ios_xe 3.17.1as

cisco ios_xe 3.17.1s

cisco ios_xe 3.17.2s

cisco ios_xe 3.17.3s

cisco ios_xe 3.17.4s

cisco ios_xe 3.18.0as

cisco ios_xe 3.18.0s

cisco ios_xe 3.18.0sp

cisco ios_xe 3.18.1asp

cisco ios_xe 3.18.1bsp

cisco ios_xe 3.18.1csp

cisco ios_xe 3.18.1gsp

cisco ios_xe 3.18.1hsp

cisco ios_xe 3.18.1isp

cisco ios_xe 3.18.1s

cisco ios_xe 3.18.1sp

cisco ios_xe 3.18.2asp

cisco ios_xe 3.18.2s

cisco ios_xe 3.18.2sp

cisco ios_xe 3.18.3asp

cisco ios_xe 3.18.3bsp

cisco ios_xe 3.18.3s

cisco ios_xe 3.18.3sp

cisco ios_xe 3.18.4s

cisco ios_xe 3.18.4sp

cisco ios_xe 3.18.5sp

cisco ios_xe 3.18.6sp

cisco ios_xe 3.18.7sp

cisco ios_xe 3.18.8asp

cisco ios_xe 3.18.8sp

cisco ios_xe 3.18.9sp

cisco ios_xe 16.1.1

cisco ios_xe 16.1.2

cisco ios_xe 16.1.3

cisco ios_xe 16.2.1

cisco ios_xe 16.2.2

cisco ios_xe 16.3.1

cisco ios_xe 16.3.1a

cisco ios_xe 16.3.2

cisco ios_xe 16.3.3

cisco ios_xe 16.3.4

cisco ios_xe 16.3.5

cisco ios_xe 16.3.5b

cisco ios_xe 16.3.6

cisco ios_xe 16.3.7

cisco ios_xe 16.3.8

cisco ios_xe 16.3.9

cisco ios_xe 16.3.10

cisco ios_xe 16.3.11

cisco ios_xe 16.4.1

cisco ios_xe 16.4.2

cisco ios_xe 16.4.3

cisco ios_xe 16.5.1

cisco ios_xe 16.5.1a

cisco ios_xe 16.5.1b

cisco ios_xe 16.5.2

cisco ios_xe 16.5.3

cisco ios_xe 16.6.1

cisco ios_xe 16.6.2

cisco ios_xe 16.6.3

cisco ios_xe 16.6.4

cisco ios_xe 16.6.4a

cisco ios_xe 16.6.4s

cisco ios_xe 16.6.5

cisco ios_xe 16.6.5a

cisco ios_xe 16.6.5b

cisco ios_xe 16.6.6

cisco ios_xe 16.6.7

cisco ios_xe 16.6.7a

cisco ios_xe 16.6.8

cisco ios_xe 16.6.9

cisco ios_xe 16.7.1

cisco ios_xe 16.7.1a

cisco ios_xe 16.7.1b

cisco ios_xe 16.7.2

cisco ios_xe 16.7.3

cisco ios_xe 16.7.4

cisco ios_xe 16.8.1

cisco ios_xe 16.8.1a

cisco ios_xe 16.8.1b

cisco ios_xe 16.8.1c

cisco ios_xe 16.8.1d

cisco ios_xe 16.8.1e

cisco ios_xe 16.8.1s

cisco ios_xe 16.8.2

cisco ios_xe 16.8.3

cisco ios_xe 16.9.1

cisco ios_xe 16.9.1a

cisco ios_xe 16.9.1b

cisco ios_xe 16.9.1c

cisco ios_xe 16.9.1d

cisco ios_xe 16.9.1s

cisco ios_xe 16.9.2

cisco ios_xe 16.9.2a

cisco ios_xe 16.9.2s

cisco ios_xe 16.9.3

cisco ios_xe 16.9.3a

cisco ios_xe 16.9.3h

cisco ios_xe 16.9.3s

cisco ios_xe 16.9.4

cisco ios_xe 16.9.4c

cisco ios_xe 16.9.5

cisco ios_xe 16.9.5f

cisco ios_xe 16.9.6

cisco ios_xe 16.9.7

cisco ios_xe 16.10.1

cisco ios_xe 16.10.1a

cisco ios_xe 16.10.1b

cisco ios_xe 16.10.1c

cisco ios_xe 16.10.1d

cisco ios_xe 16.10.1e

cisco ios_xe 16.10.1f

cisco ios_xe 16.10.1g

cisco ios_xe 16.10.1s

cisco ios_xe 16.10.2

cisco ios_xe 16.10.3

cisco ios_xe 16.11.1

cisco ios_xe 16.11.1a

cisco ios_xe 16.11.1b

cisco ios_xe 16.11.1c

cisco ios_xe 16.11.1s

cisco ios_xe 16.11.2

cisco ios_xe 16.12.1

cisco ios_xe 16.12.1a

cisco ios_xe 16.12.1c

cisco ios_xe 16.12.1s

cisco ios_xe 16.12.1t

cisco ios_xe 16.12.1w

cisco ios_xe 16.12.1x

cisco ios_xe 16.12.1y

cisco ios_xe 16.12.1z

cisco ios_xe 16.12.1z1

cisco ios_xe 16.12.1z2

cisco ios_xe 16.12.1za

cisco ios_xe 16.12.2

cisco ios_xe 16.12.2a

cisco ios_xe 16.12.2s

cisco ios_xe 16.12.2t

cisco ios_xe 16.12.3

cisco ios_xe 16.12.3a

cisco ios_xe 16.12.3s

cisco ios_xe 16.12.4

cisco ios_xe 16.12.4a

cisco ios_xe 16.12.5

cisco ios_xe 16.12.5a

cisco ios_xe 16.12.5b

cisco ios_xe 17.1.1

cisco ios_xe 17.1.1a

cisco ios_xe 17.1.1s

cisco ios_xe 17.1.1t

cisco ios_xe 17.1.2

cisco ios_xe 17.1.3

cisco ios_xe 17.2.1

cisco ios_xe 17.2.1a

cisco ios_xe 17.2.1r

cisco ios_xe 17.2.1v

cisco ios_xe 17.2.2

cisco ios_xe 17.2.3

cisco ios_xe 17.3.1

cisco ios_xe 17.3.1a

cisco ios_xe 17.3.1w

cisco ios_xe 17.3.1x

cisco ios_xe 17.3.1z

cisco ios_xe 17.3.2

cisco ios_xe 17.3.2a

cisco ios_xe 17.3.3

cisco ios_xe 17.3.3a

cisco ios_xe 17.4.1

cisco ios_xe 17.4.1a

cisco ios_xe 17.4.1b

cisco ios_xe 17.4.1c

Vendor Advisories

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) support for the AutoReconnect feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to exhaust the free IP addresses from the assigned local pool This vulnerability occurs because the code does not release the allocated IP address under c ...