CVE-2026-20015 Details
Description
A vulnerability in the IKEv2 feature of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device that may impact the availability of services to devices elsewhere in the network. This vulnerability is due to a memory leak when parsing IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. A successful exploit could allow the attacker to exhaust resources, causing a DoS condition that will eventually require the device to be manually reloaded.
A denial-of-service vulnerability has been identified in the IKEv2 feature of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software. This vulnerability allows an unauthenticated, remote attacker to cause a DoS condition on an affected device, potentially impacting the availability of services to other devices on the network. The issue arises from a memory leak during the parsing of IKEv2 packets, which an attacker could exploit by sending crafted IKEv2 packets to the device. The resulting memory exhaustion can cause the device to reload, disrupting services.
Cisco has released software updates to address this vulnerability. Instructions for upgrading Cisco Secure Firewall ASA and Secure FTD Software are available in the respective upgrade guides. For help determining the best release to upgrade to, consult the Cisco Secure Firewall Compatibility Guides.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 4, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ikev2-dos-eBueGdEG | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-401 | Missing Release of Memory after Effective Lifetime | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| cisco adaptive security appliance software | >= 9.18.1, < 9.18.4.71 >= 9.19.1, < 9.20.4.10 >= 9.22.1.1, < 9.22.2.13 >= 9.23.1, < 9.23.1.19 |
CPE
Remediation
| |
| cisco secure firewall threat defense | >= 7.2.0, < 7.2.11 >= 7.3.0, < 7.4.3 >= 7.6.0, < 7.6.4 >= 7.7.0, < 7.7.11 |
CPE
Remediation
| |
Change History
8 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 11, 2026 | CPE Deprecation Remap | [email protected] |
| Aug 11, 2026 | CPE Deprecation Remap | [email protected] |
| Aug 11, 2026 | CPE Deprecation Remap | [email protected] |
| Aug 11, 2026 | CPE Deprecation Remap | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 16, 2026 | Initial Analysis | [email protected] |
| Mar 4, 2026 | New CVE Received | [email protected] |