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ReviewHigh

CVE-2020-3191

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

A vulnerability in DNS over IPv6 packet processing for Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to unexpectedly reload, resulting in a denial of service (DoS) condition. The vulnerability is due to improper length validation of a field in an IPv6 DNS packet. An attacker could exploit this vulnerability by sending a crafted DNS query over IPv6, which traverses the affected device. An exploit could allow the attacker to cause the device to reload, resulting in a DoS conditio...

CVSS
8.6
EPSS
1.82%
77.2% 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 probability1.82%
Technical severityCVSS 8.6

Vulnerability overview

A vulnerability in DNS over IPv6 packet processing for Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to unexpectedly reload, resulting in a denial of service (DoS) condition. The vulnerability is due to improper length validation of a field in an IPv6 DNS packet. An attacker could exploit this vulnerability by sending a crafted DNS query over IPv6, which traverses the affected device. An exploit could allow the attacker to cause the device to reload, resulting in a DoS conditio...

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 < 6.4.0.6, 9.4(1), 96.4(0.42), >= 9.6 < 9.6.4.36, >= 9.8 < 9.8.4.12, >= 9.9 < 9.9.2.66, >= 9.10 < 9.10.1.37, >= 9.12 < 9.12.2.9
Fixed versions
6.2.3.16, 6.3.0.6, 6.4.0.6, 9.6.4.36, 9.8.4.12, 9.9.2.66, 9.10.1.37, 9.12.2.9

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-20