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CVE-2026-20013

MEDIUMCVSS 5.8/10EPSS 0.30%

Last modified

CVE-2026-20013 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 also impact the availability of services to devices elsewhere in the network. This vulnerability is due to memory exhaustion caused by not freeing memory during IKEv2 packet processing. 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 also impact the availability of services to devices elsewhere in the network. This vulnerability is due to memory exhaustion caused by not freeing memory during IKEv2 packet processing. 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 manually reload.

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, < 9.18.4.66
CiscoAdaptive Security Appliance Software>= 9.19.1, < 9.20.3.20
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>= 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, < 7.7.10

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-20013?
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 also impact the availability of services to devices elsewhere in the network. This vulnerability is due to memory exhaustion caused by not freeing memory during IKEv2 packet processing. 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 manually reload.
How severe is CVE-2026-20013?
CVE-2026-20013 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-2026-20013?
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-2026-20013?

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

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Source: NVD / NIST