CVE-2020-3554

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Denial of Service Vulnerability

HIGH
7.5
CVSS Score
Published: October 21, 2020 at 06:41 PM UTC
Updated: August 11, 2026 at 07:37 PM UTC
2 products affected across 1 vendorAdaptive Security ApplianceSecure Firewall Threat Defense

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Severity
HIGH7.5
Exploit prediction
EPSS 3%
SSVC
No known exploit

Description

A vulnerability in the TCP packet processing of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a memory exhaustion condition. An attacker could exploit this vulnerability by sending a high rate of crafted TCP traffic through an affected device. A successful exploit could allow the attacker to exhaust device resources, resulting in a DoS condition for traffic transiting the affected device.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 9.12.4.39.13.0 ≤ v < 9.13.1.139.14.0 ≤ v < 9.14.1.30
Affected range stops below 9.12.4.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.13.1.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.14.1.30, so it looks safe — our inference, not a vendor statement
v ≤ 6.2.26.3.0 ≤ v < 6.4.0.106.5.0 ≤ v < 6.5.0.56.6.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400

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