Auth bypass in Cisco Adaptive Security Appliance Software
CVE-2020-3125
A vulnerability in the Kerberos authentication feature of Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to impersonate the Kerberos key distribution center (KDC) and bypass authentication on an affected device that is configured to perform Kerberos authentication for VPN or local device access. The vulnerability is due to insufficient identity verification of the KDC when a successful authentication response is received. An attacker could exploit this vulnerability by spoofing the KDC server response to the ASA device. This malicious response would not have been authenticated by the KDC. A successful attack could allow an attacker to bypass Kerberos authentication.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.024 (83.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: +0.001
Affected products
- Cisco Adaptive Security Appliance Software
- Cisco Asa 5505
- Cisco Asa 5505 Firmware — versions 9.10(1.220), 9.10\(1.220\)
- Cisco Asa 5510
- Cisco Asa 5510 Firmware — versions 9.10(1.220), 9.10\(1.220\)
- Cisco Asa 5512-X
- Cisco Asa 5512-X Firmware — versions 9.10(1.220), 9.10\(1.220\)
- Cisco Asa 5515-X
- Cisco Asa 5515-X Firmware — versions 9.10(1.220), 9.10\(1.220\)
- Cisco Asa 5520
Weakness classification (CWE)
Public proof-of-concept exploits
References
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-asa-kerbero… (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-3125?
- CVE-2020-3125 is a critical-severity vulnerability in Cisco Adaptive Security Appliance Software, classified under Improper Authentication. CVSS score: 9.8/10. Published 2020-05-06.
- How severe is CVE-2020-3125?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2020-3125 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.