Cisco IOS XR Software Security Hardening Release: September 2026 (cisco-sa-hardening-iosxr-qg64NcM)

According to its self-reported version, Cisco IOS XR is affected by multiple vulnerabilities. - Multiple vulnerabilities in Cisco IOS XR Software due to improper resource control issues could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service conditio...

Vulnerabilities of Cisco IOS XR operating systems, related to insufficient validation of message correctness or data structure, allow attackers to compromise the confidentiality, integrity, and accessibility of protected information.

The vulnerability of Cisco IOS XR operating systems is related to insufficient checks for the correctness of messages or data structures. Exploiting this vulnerability can allow a malicious actor to compromise the confidentiality, integrity, and accessibility of protected information...

The vulnerability of Cisco IOS XR operating systems, related to improper handling of exceptional states, allows attackers to compromise the confidentiality, integrity, and accessibility of protected information.

The vulnerability of Cisco IOS XR operating systems is related to improper handling of exceptional states. Exploiting this vulnerability can allow an attacker to compromise the confidentiality, integrity, and accessibility of protected information...

The vulnerability of Cisco IOS XR operating systems, related to incorrect calculations, allows attackers to compromise the confidentiality, integrity, and accessibility of protected information.

The vulnerability of Cisco IOS XR operating systems is related to incorrect calculations. Exploiting this vulnerability can allow a remote attacker to compromise the confidentiality, integrity, and accessibility of protected information...

The vulnerability of Cisco IOS XR operating systems, related to deficiencies in access control, allows attackers to compromise the confidentiality, integrity, and accessibility of protected information.

The vulnerability of Cisco IOS XR operating systems is related to deficiencies in access control. Exploiting this vulnerability can allow a malicious actor to compromise the confidentiality, integrity, and accessibility of protected information...

The vulnerability of Cisco IOS XR operating systems, related to the implementation of incorrect control flow, allows attackers to trigger service interruptions.

The vulnerability of Cisco IOS XR operating systems is related to the implementation of incorrect control flow. Exploiting this vulnerability can allow a malicious actor to cause service interruptions remotely...

The vulnerability of Cisco IOS XR operating systems arises from inadequate control over resources throughout their entire lifecycle. This allows attackers to compromise the confidentiality, integrity, and accessibility of protected information.

The vulnerability of Cisco IOS XR operating systems is related to inadequate control over resources throughout their entire lifecycle. Exploiting this vulnerability can allow a malicious actor to compromise the confidentiality, integrity, and accessibility of protected information...

The vulnerability of Cisco IOS XR operating systems, related to the compromised data protection mechanism, allows attackers to compromise the integrity and accessibility of protected information.

The vulnerability of Cisco IOS XR operating systems is related to a breach in the data protection mechanism. Exploiting this vulnerability allows an attacker to potentially compromise the integrity and accessibility of protected information...

Vulnerabilities found in Cisco Nexus 9000 Series, iOS XR Software, and Secure Email

Cisco has identified vulnerabilities in Cisco Nexus 9000 Series switches with Silicon One technology, Cisco IOS XR software, and Cisco Secure Email. The most serious vulnerability affects Nexus 9000 switches: when TCP ports 43210 or 43211 are accessible, an attacker can execute commands without a...

CVE-2026-20278

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. Th...

CVE-2026-20280

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. Th...

CVE-2026-20277

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. Th...

CVE-2026-20279

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. Th...

CVE-2026-20274

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. Th...

CVE-2026-20276

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. Th...

CVE-2026-20275

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. Th...

CVE-2026-20278 Cisco IOS XR Software Security Hardening Release: September 2026

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. Th...

EUVD-2026-70208

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. Th...

CVE-2026-20278

CVE-2026-20278 affects Cisco IOS XR Software and stems from improper neutralization issues (CWE-707) discovered through Cisco's internal security review. Multiple vulnerabilities are grouped under this single CVE in the September 2026 hardening release . The CVSS 3.1 score is 8.8 (HIGH) with a ne...

CVE-2026-20278 Cisco IOS XR Software Security Hardening Release: September 2026

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. Th...