Use After Free in Cisco Adaptive Security Appliance Software
CVE-2021-40125
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.
Vulnerability class: Use-After-Free
EPSS: 0.010 (58.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Cisco Adaptive_security_appliance_software
- Cisco Asa_5505
- Cisco Asa_5505_firmware — versions 009.016\(001.025\)
- Cisco Asa_5512-x
- Cisco Asa_5512-x_firmware — versions 009.016\(001.025\)
- Cisco Asa_5515-x
- Cisco Asa_5515-x_firmware — versions 009.016\(001.025\)
- Cisco Asa_5525-x
- Cisco Asa_5525-x_firmware — versions 009.016\(001.025\)
- Cisco Asa_5545-x
Weakness classification (CWE)
Public proof-of-concept exploits
References
- psirt@cisco.com (x_refsource_CISCO, vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-40125?
- CVE-2021-40125 is a medium-severity vulnerability in Cisco Adaptive Security Appliance Software, classified under Use After Free. CVSS score: 5.3/10. Published 2021-10-27.
- How severe is CVE-2021-40125?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2021-40125 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.