CVE-2019-12677

Published Oct 2, 2019

Last updated a year ago

CVSS medium 6.5

Overview

Description: 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.
Source: ykramarz@cisco.com
NVD status: Modified

Risk scores

CVSS 3.1

Type: Primary
Base score: 6.5
Impact score: 3.6
Exploitability score: 2.8
Vector string: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Severity: MEDIUM

CVSS 3.0

Type: Secondary
Base score: 7.7
Impact score: 4
Exploitability score: 3.1
Vector string: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Severity: HIGH

CVSS 2.0

Type: Primary
Base score: 4
Impact score: 2.9
Exploitability score: 8
Vector string: AV:N/AC:L/Au:S/C:N/I:N/A:P

Weaknesses

nvd@nist.gov: CWE-755
ykramarz@cisco.com: CWE-172

Hype score: Not currently trending

Configurations

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Overview

Risk scores

CVSS 3.1

CVSS 3.0

CVSS 2.0

Weaknesses

Social media

Configurations

References