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ReviewHigh

CVE-2020-3196

Cisco Cisco Adaptive Security Appliance (ASA) Software, secure firewall threat defense, asa 5505 firmware

A vulnerability in the Secure Sockets Layer (SSL)/Transport Layer Security (TLS) handler of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust memory resources on the affected device, leading to a denial of service (DoS) condition. The vulnerability is due to improper resource management for inbound SSL/TLS connections. An attacker could exploit this vulnerability by establishing multiple SSL/TLS connections with specific conditions to the affected device. A successful exploit could al...

CVSS
8.6
EPSS
2.13%
80.7% percentile
CISA KEV
Not listed
Published
2020.05.07
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability2.13%
Technical severityCVSS 8.6

Vulnerability overview

A vulnerability in the Secure Sockets Layer (SSL)/Transport Layer Security (TLS) handler of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust memory resources on the affected device, leading to a denial of service (DoS) condition. The vulnerability is due to improper resource management for inbound SSL/TLS connections. An attacker could exploit this vulnerability by establishing multiple SSL/TLS connections with specific conditions to the affected device. A successful exploit could al...

Affected product and versions

Product
Cisco Cisco Adaptive Security Appliance (ASA) Software, secure firewall threat defense, asa 5505 firmware
Affected versions
>= 6.2.3 < 6.2.3.16, >= 6.3.0 < 6.3.0.6, >= 6.4.0 < 6.4.0.9, >= 6.5.0 < 6.5.0.5, 9.4(4), 9.8(4.18), 100.13(0), >= 9.6 < 9.6.4.40, >= 9.8 < 9.8.4.20, >= 9.9 < 9.9.2.66, >= 9.10 < 9.10.1.37, >= 9.12 < 9.12.3.2, >= 9.13 < 9.13.1.7
Fixed versions
6.2.3.16, 6.3.0.6, 6.4.0.9, 6.5.0.5, 9.6.4.40, 9.8.4.20, 9.9.2.66, 9.10.1.37, 9.12.3.2, 9.13.1.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Cisco Cisco Adaptive Security Appliance (ASA) Software, secure firewall threat defense, asa 5505 firmware and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE
CWE-400