A vulnerability in the Internet Key Exchange Version 2 (IKEv2) implementation of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to trigger a denial of service (DoS) condition on an affected device. This vulnerability is due to improper control of a resource. An attacker with the ability to spoof a trusted IKEv2 site-to-site VPN peer and in possession of valid IKEv2 credentials for that peer could exploit this vulnerability by sending malformed, authenticated IKEv2 messages to an affected device. A successful exploit could allow the attacker to trigger a reload of the device.
Published 2021-10-27 19:15:09
Updated 2023-08-16 16:17:08
View at NVD,   CVE.org
Vulnerability category: Denial of service

Exploit prediction scoring system (EPSS) score for CVE-2021-40125

0.11%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 43 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-40125

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
6.3
MEDIUM AV:N/AC:M/Au:S/C:N/I:N/A:C
6.8
6.9
NIST
5.3
MEDIUM CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
1.6
3.6
Cisco Systems, Inc.
6.5
MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.8
3.6
NIST

CWE ids for CVE-2021-40125

  • The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
    Assigned by: nvd@nist.gov (Primary)
  • Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
    Assigned by: ykramarz@cisco.com (Secondary)

References for CVE-2021-40125

Products affected by CVE-2021-40125

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