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CVE-2026-20015

MEDIUMCVSS 5.8/10EPSS 0.30%

Last modified

CVE-2026-20015 is a medium-severity vulnerability rated 5.8/10 on the CVSS scale. 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. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
5.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

EPSS Probability
0.30%

21.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance Software>= 9.18.1, < 9.18.4.71
CiscoAdaptive Security Appliance Software>= 9.19.1, < 9.20.4.10
CiscoAdaptive Security Appliance Software>= 9.22.1.1, < 9.22.2.13
CiscoAdaptive Security Appliance Software>= 9.23.1, < 9.23.1.19
CiscoFirepower Threat Defense Software>= 7.2.0, < 7.2.11
CiscoFirepower Threat Defense Software>= 7.3.0, < 7.4.3
CiscoFirepower Threat Defense Software>= 7.6.0, < 7.6.4
CiscoFirepower Threat Defense Software>= 7.7.0, < 7.7.11

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-20015?
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.
How severe is CVE-2026-20015?
CVE-2026-20015 has a CVSS score of 5.8/10 (MEDIUM severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20015?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20015?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST