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Multiple Vulnerabilities in CISCO

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

Severity Rating: HIGH

Overview

Multiple vulnerabilities have been reported in Cisco Secure Firewall ASA Software and Cisco Secure Firewall Threat Defense could allow an unauthenticated attacker to send specially crafted packets to the SSL VPN service, potentially causing memory exhaustion, device reloads, or an unresponsive web interface, resulting in a Denial-of-Service (DoS) condition on the affected 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 Cisco Secure Firewall Threat Defense (FTD) Software due to insufficient validation and error handling when processing VPN authentication messages, HTTP requests, and other user-supplied inputs. An attacker could exploit these Vulnerabilities by sending specially crafted packets to the SSL VPN service, which could lead to memory exhaustion, device reloads, or the web interface becoming unresponsive.

Successful exploitation these Vulnerabilities could result in a Denial-of-Service (DoS) condition on the affected device.

Solution

Apply appropriate updates as mentioned in Cisco Advisory

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-m9sx6MbC

Vendor Information

CISCO

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-m9sx6MbC

References

CISCO

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-m9sx6MbC

CVE Name

CVE-2026-20101

CVE-2026-20103

CVE-2026-20100

CVE-2026-20105

CVE-2026-20106

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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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