CVE-2026-20039

HIGH EPSS 27.8%
Published Mar 4, 20263mo ago · Modified Apr 16, 20262mo ago
8.6 CVSS 3.1
High
Find Similar
Published Mar 4, 2026 3mo ago
Last Modified Apr 16, 2026 2mo ago

Description

A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to ineffective memory management of the VPN web server. An attacker could exploit this vulnerability by sending a large number of crafted HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

CVSS Details

Base Score
8.6
Exploitability
3.9
Impact
4.0
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Changed
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
27.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-244

Affected Products 10

VendorProductVersionRange
ciscoadaptive_security_appliance_software*≥9.12.1  –  <9.16.4.84
ciscoadaptive_security_appliance_software*≥9.17.1  –  <9.18.4.57
ciscoadaptive_security_appliance_software*≥9.19.1  –  <9.20.3.16
ciscoadaptive_security_appliance_software*≥9.22.1.1  –  <9.22.2.4
ciscoadaptive_security_appliance_software*≥9.23.1  –  <9.23.1.3
ciscofirepower_threat_defense_software*≥6.4.0  –  <7.0.9
ciscofirepower_threat_defense_software*≥7.1.0  –  <7.2.10
ciscofirepower_threat_defense_software*≥7.3.0  –  <7.4.3
ciscofirepower_threat_defense_software*≥7.6.0  –  <7.6.1
ciscofirepower_threat_defense_software*≥7.7.0  –  <7.7.10

References 1

  • sec.cloudapps.cisco.com https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-SpOFF2Re
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.