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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.010 (61.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Cisco Adaptive Security Appliance Software
- Cisco Asa 5505
- Cisco Asa 5505 Firmware — versions 009.016(001.025), 009.016\(001.025\)
- Cisco Asa 5512-X
- Cisco Asa 5512-X Firmware — versions 009.016(001.025), 009.016\(001.025\)
- Cisco Asa 5515-X
- Cisco Asa 5515-X Firmware — versions 009.016(001.025), 009.016\(001.025\)
- Cisco Asa 5525-X
- Cisco Asa 5525-X Firmware — versions 009.016(001.025), 009.016\(001.025\)
- Cisco Asa 5545-X
Weakness classification (CWE)
Public proof-of-concept exploits
References
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-i… (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.