CVE-2026-20015
Denial‑of‑Service via Memory Leak in IKEv2 Processing
Published Mar 4, 2026
CVSS 3.1 · 5.8 Medium
EPSS < 1%
KEV · Not listed
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.
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.
Affected Products
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CVE record
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NVD configurations
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Red Hat packages
No data
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OpenCVE enrichment
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Cisco | Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | affected |
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| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | affected |
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Configuration 1 [-]
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Configuration 2 [-]
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No data.
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| Cisco | Adaptive Security Appliance Software |
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| Cisco | Secure Firewall Threat Defense |
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Remediation
Tracking
Advisories
Metrics
No CVSS v4.0
Attack Vector Network
Attack Complexity Low
Privileges Required None
Scope Changed
Confidentiality Impact None
Integrity Impact None
Availability Impact Low
User Interaction None
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.354% probability within 30 days)
Exploitation none
Automatable yes
Technical Impact partial
References
History
Aug 11, 2026 8:00 PM
Affected versions updated. Affected vendors updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Cisco firepower Threat Defense Software
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Apr 16, 2026 8:15 PM
First appearance in the feed. Affected versions updated. Affected vendors updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Cisco firepower Threat Defense Software
|
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| CPEs | cpe:2.3:a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:* cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* |
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| Vendors & Products |
Cisco firepower Threat Defense Software
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Apr 16, 2026 1:45 PM
Title updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Denial‑of‑Service via Memory Leak in IKEv2 Processing |
Mar 5, 2026 9:15 AM
First appearance in the feed. Affected vendors updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Cisco
Cisco adaptive Security Appliance Software Cisco secure Firewall Threat Defense |
|
| Vendors & Products |
Cisco
Cisco adaptive Security Appliance Software Cisco secure Firewall Threat Defense |
Mar 4, 2026 10:15 PM
Scoring metrics updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Mar 4, 2026 5:30 PM
Description updated. Weaknesses updated. Added references. Scoring metrics updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Weaknesses | CWE-401 | |
| References |
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| Metrics |
cvssV3_1
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Subscriptions
Weaknesses
