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Multiple Vulnerabilities in CISCO 

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

Severity Rating: MEDIUM

Systems Affected

Open Source Snort 3

Cisco Secure Firewall Threat Defense (FTD) Software

Cisco IOS XE Software or UTD Engine for Cisco IOS XE SD-WAN Software

1000 Series Integrated Services Routers (ISRs)

4000 Series ISRs

Catalyst 8000V Edge Software

Catalyst 8200 Series Edge Platforms

Catalyst 8300 Series Edge Platforms

Catalyst 8500L Edge Platforms

Cloud Services Routers 1000V

Integrated Services Virtual Routers

Cisco Meraki software

Note: UTD is not installed on these devices by default. If the UTD file is not installed, the device is not affected by these vulnerabilities.

Overview

Multiple vulnerabilities have been reported in  the processing of Distributed Computing Environment Remote Procedure Call (DCE/RPC) requests could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to leak sensitive information or to restart, which would result in an interruption of packet inspection.

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

1. Denial of Service Vulnerability ( CVE-2026-20026   )

This vulnerability exists due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer use-after-free read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3.

Successful exploitation of this vulnerability could allow the attacker unexpectedly restart the Snort 3 Detection Engine, which could cause a denial of service (DoS).

2. Information Disclosure vulnerability ( CVE-2026-20027   )

This vulnerability exists due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer out-of-bounds read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3.

Successful exploitation of this vulnerability could allow the attacker to obtain sensitive information in the Snort 3 data stream.

Solution

Apply appropriate updates as mentioned in Cisco Advisory

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-dcerpc-vulns-J9HNF4tH

Vendor Information

CISCO

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-dcerpc-vulns-J9HNF4tH

References

CISCO

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-dcerpc-vulns-J9HNF4tH

CVE Name

CVE-2026-20026

CVE-2026-20027

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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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