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Denial of Service vulnerabilities in CISCO

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: HIGH

Software Affected

Cisco Secure Firewall ASA Software 

Secure FTD Software

Overview

Multiple vulnerabilities have been reported in Cisco Secure Firewall ASA and FTD software, affecting IKEv2 and GCM‑encrypted IPsec processing which could allow a remote attacker by sending crafted packets to Exhaust memory or system resources, Cause device reloads or crashes, denial-of-service (DoS) conditions on targeted device.

Target Audience: 

All IT administrators and individuals responsible for maintaining and updating in Software.

Risk Assessment:

High risk of data manipulation and service disruption.

Impact Assessment:

Potential impact on confidentiality, integrity, and availability of the system.

Description

Multiple vulnerabilities exist in Cisco Secure Firewall ASA Software and Secure FTD Software due to improper handling of IKEv2 packets, memory leaks, failure to free memory during packet processing, and insufficient memory allocation for GCM-encrypted IPsec traffic. An attacker could exploit these issues by sending specially crafted IKEv2 or GCM-encrypted IPsec packets to an affected device, potentially exhausting memory or system resources.

Successful exploitation of these vulnerabilities  result in device reloads, crashes, or denial-of-service conditions.

Solution

Apply appropriate updates as mentioned in Cisco Advisory

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ikev2-dos-eBueGdEG

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-esp-dos-uv7yD8P5

Vendor Information

CISCO

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ikev2-dos-eBueGdEG

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-esp-dos-uv7yD8P5

References

CISCO

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ikev2-dos-eBueGdEG

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-esp-dos-uv7yD8P5

CVE Name

CVE-2026-20014

CVE-2026-20013

CVE-2026-20015

CVE-2026-20049

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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