CVE-2021-1620
Detail
Modified This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.
Description
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 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 attacker 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.
Metrics
CVSS Version 4.0
CVSS Version 3.x
CVSS Version 2.0
NVD enrichment efforts reference publicly available information to associate
vector strings. CVSS information contributed by other sources is also
displayed.
CVSS 4.0 Severity and Vector Strings:
NVD assessment
not yet provided.
CVSS 3.x Severity and Vector Strings:
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CVSS 2.0 Severity and Vector Strings:
Vector:
(AV:N/AC:M/Au:S/C:N/I:N/A:P)
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Weakness Enumeration
CWE-ID
CWE Name
Source
CWE-772
Missing Release of Resource after Effective Lifetime
NIST
CWE-563
Assignment to Variable without Use
Cisco Systems, Inc.
Change History
28 change records found show
changes
CVE Modified by CVE 11/21/2024 12:44:45 AM
Action
Type
Old Value
New Value
Added
Reference
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ikev2-ebFrwMPr
CVE Modified by Cisco Systems, Inc. 5/14/2024 3:59:13 AM
Action
Type
Old Value
New Value
CVE Modified by Cisco Systems, Inc. 11/06/2023 10:28:48 PM
Action
Type
Old Value
New Value
Added
CVSS V3.1
Cisco Systems, Inc. AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Removed
CVSS V3
Cisco Systems, Inc. AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_4221:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:4221_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_4331:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:4331_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_4000:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:4000_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1000:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1000_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_4321:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:4321_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_4351:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:4351_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1111x-8p:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1111x-8p_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1100-8p:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1100-8p_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1100-4p:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1100-4p_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1101-4p:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1101-4p_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1109-4p:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1109-4p_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1109-2p:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1109-2p_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_4431:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:4431_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_4461:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:4461_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1100:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1100_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1101:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1101_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1109:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1109_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_111x:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:111x_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1111x:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1111x_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1120:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1120_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1160:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1160_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_4451-x:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:4451-x_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_4451:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:4451_integrated_services_router:-:*:*:*:*:*:*:*
CPE Deprecation Remap by NIST 5/22/2023 2:57:24 PM
Action
Type
Old Value
New Value
Changed
CPE Configuration
OR
*cpe:2.3:h:cisco:isr_1100-4g/6g:-:*:*:*:*:*:*:*
OR
*cpe:2.3:h:cisco:1100-4g/6g_integrated_services_router:-:*:*:*:*:*:*:*
Initial Analysis by NIST 10/13/2021 3:43:00 PM
Action
Type
Old Value
New Value
Added
CVSS V3.1
NIST AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Added
CVSS V2
NIST (AV:N/AC:M/Au:S/C:N/I:N/A:P)
Added
CWE
NIST CWE-772
Added
CPE Configuration
Record truncated, showing 500 of 56074 characters. View Entire Change Record AND
OR
*cpe:2.3:o:cisco:ios:12.2\(6\)i1:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:ios:15.1\(3\)svr1:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:ios:15.1\(3\)svr2:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:ios:15.1\(3\)svr3:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:ios:15.1\(3\)svs:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:ios:15.1\(3\)svs1:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:ios:15.1\(3\)svt1:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:ios:15.1\(3\)svt2:*:*:*:*:*:*:*
*cpe:2.3:
Changed
Reference Type
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ikev2-ebFrwMPr No Types Assigned
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ikev2-ebFrwMPr Patch, Vendor Advisory
Quick Info
CVE Dictionary Entry: CVE-2021-1620 NVD
Published Date: 09/22/2021 NVD
Last Modified: 11/21/2024
Source: Cisco Systems, Inc.
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