high
7.7
CWE
755 172
Advisory Published
Updated

CVE-2019-12677: Cisco Adaptive Security Appliance Software SSL VPN Denial of Service Vulnerability

First published: Wed Oct 02 2019(Updated: )

A vulnerability in the Secure Sockets Layer (SSL) VPN feature of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition that prevents the creation of new SSL/Transport Layer Security (TLS) connections to an affected device. The vulnerability is due to incorrect handling of Base64-encoded strings. An attacker could exploit this vulnerability by opening many SSL VPN sessions to an affected device. The attacker would need to have valid user credentials on the affected device to exploit this vulnerability. A successful exploit could allow the attacker to overwrite a special system memory location, which will eventually result in memory allocation errors for new SSL/TLS sessions to the device, preventing successful establishment of these sessions. A reload of the device is required to recover from this condition. Established SSL/TLS connections to the device and SSL/TLS connections through the device are not affected. Note: Although this vulnerability is in the SSL VPN feature, successful exploitation of this vulnerability would affect all new SSL/TLS sessions to the device, including management sessions.

Credit: ykramarz@cisco.com ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Adaptive Security Appliance Software>=9.3<9.3.3.9
Cisco Adaptive Security Appliance Software<9.1.7.4
Cisco Adaptive Security Appliance Software>=9.2<9.2.4.8
Cisco Adaptive Security Appliance Software>=9.4<9.4.2.11
Cisco Adaptive Security Appliance Software>=9.5<9.5.2.5
Cisco Adaptive Security Appliance Software>=9.6<9.6.2
Cisco Asa 5505
Cisco Asa 5510
Cisco Asa 5512-x
Cisco Asa 5515-x
Cisco Asa 5520
Cisco Asa 5525-x
Cisco Asa 5550
Cisco Asa 5555-x
Cisco Asa 5580
Cisco Asa 5585-x

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Reference Links

Frequently Asked Questions

  • What is CVE-2019-12677?

    CVE-2019-12677 is a vulnerability in the SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software that allows an authenticated, remote attacker to cause a denial of service (DoS) condition.

  • How does CVE-2019-12677 affect Cisco ASA Software?

    CVE-2019-12677 affects Cisco ASA Software versions 9.1.7.4 and earlier, 9.2.4.8 and earlier, 9.3.3.9 and earlier, 9.4.2.11 and earlier, 9.5.2.5 and earlier, and 9.6.2 and earlier.

  • What is the severity of CVE-2019-12677?

    CVE-2019-12677 has a severity rating of 6.5 (high).

  • How can an authenticated attacker exploit CVE-2019-12677?

    An authenticated attacker can exploit CVE-2019-12677 by sending a specially crafted HTTP request to the targeted device, causing a DoS condition.

  • Is there a fix available for CVE-2019-12677?

    Yes, Cisco has released a security advisory with fixes and mitigations for CVE-2019-12677. Please refer to the official Cisco Security Advisory for more information.

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