—–BEGIN PGP SIGNED MESSAGE—–

Hash: SHA256

Denial of Service Vulnerability in CISCO

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

Severity Rating: CRITICAL

Software Affected

Cisco Secure Firewall ASA Software 

Secure FTD Software

Overview

A Vulnerability has been reported in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an 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

A vulnerability exists in Cisco Secure Firewall ASA Software & Secure FTD Software due to the ineffective memory management of the VPN web server. An attacker could exploit this vulnerability by sending a large number of crafted HTTP requests to an affected device.

Successful exploitation of this vulnerability could allow the attacker to cause reload, resulting in a DoS condition.

Solution

Apply appropriate updates as mentioned in Cisco Advisory

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-SpOFF2Re

Vendor Information

CISCO

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-SpOFF2Re

References

CISCO

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-SpOFF2Re

CVE Name

CVE-2026-20039

– —

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

—–BEGIN PGP SIGNATURE—–

iQIzBAEBCAAdFiEE6r4Iam/Ey0c/KakL3jCgcSdcys8FAmmwFYUACgkQ3jCgcSdc

ys9AAxAAkj+lMDl/HI2wPw42KaRcxkCgtPlBs4dpoK3anY/Sc++/7AR4i6PPEDoY

314AJ/ufcwYdw+wi3mLoy38PWne/hcA2/66ClCmjLL/R/D1adrTijyffN8pBXiPT

/IPFqIyY2TZLVOAXivTIbEtAXOHuZ2lZEz0wgV/1GTrIciefY76j9r/AHs+UdSUu

MW1qD5gWFZ/0oaDThv9cnje1QXDXxLzaVZ38AIGzdDlIVUJD/ES+Z4tcxvvB0296

oSEh7890HEnVTaa+XlpMcztorAENS0HFydD1agH9cZ07t71EqPFb4lQS9MK7eqvG

ualUNz7DnyDsgIrj6wLsI2PMfFcoZt0Ur91G+KINmN1oly+wP1SKT2m2xOTk7hJd

BZ0f74ogSB+m0ZAB9V1x/YEIFoeWA9y6/R3h/lBVcA4P+e85cC6jEMHU4IlePlV5

LzxAoxu6guv0lFCXTArpUsegFITdwcG5Mee5CkT/Yntsv8HjjON089kmt1/pZ2IB

zJfiCayjQ3EB3E4X8wVQbDzJqqoKvRkhsxMnCjcwAHIq5Amxp+3JY5AwYLxR9B51

qToc4BhSVhEoEI8UTpkfoxvG34MNIpEshiekJoSWARCfJdxlvRbhkyda2OxaaKRY

ycvSge/YPq7tmOeDP4ZX6HXH47w7KCtbo0hyucAbgz1lQYtI9h0=

=xjB4

—–END PGP SIGNATURE—–