CVE-2020-27124: Cisco Adaptive Security Appliance Software SSL/TLS Denial of Service Vulnerability
First published: Mon Nov 18 2024(Updated: )
A vulnerability in the SSL/TLS handler of Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause the affected device to reload unexpectedly, leading to a denial of service (DoS) condition. The vulnerability is due to improper error handling on established SSL/TLS connections. An attacker could exploit this vulnerability by establishing an SSL/TLS connection with the affected device and then sending a malicious SSL/TLS message within that connection. A successful exploit could allow the attacker to cause the device to reload.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Adaptive Security Appliance Software |
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Reference Links
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ssl-dos-7uZWwSEy
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sa-rv-routers-xss-K7Z5U6q3
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-xss-bLZw4Ctq
Frequently Asked Questions
What is the severity of CVE-2020-27124?
The severity of CVE-2020-27124 is high due to its potential to cause a denial of service (DoS) condition.
How do I fix CVE-2020-27124?
To fix CVE-2020-27124, you should apply the latest firmware or security updates recommended by Cisco for Adaptive Security Appliance (ASA) Software.
What impact does CVE-2020-27124 have on Cisco ASA devices?
CVE-2020-27124 can lead to unexpected device reloads, resulting in a denial of service and loss of accessibility to network resources.
Is authentication required to exploit CVE-2020-27124?
No, authentication is not required, allowing unauthenticated remote attackers to exploit CVE-2020-27124.
What versions of Cisco ASA are affected by CVE-2020-27124?
CVE-2020-27124 affects various versions of Cisco Adaptive Security Appliance (ASA) Software, and users should check the specific advisories from Cisco for details.
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