CVE-2026-76505

A vulnerability in the IPv4 packet processing functionality of Cisco IOS XR Software that affects Cisco ASR 9000 and 9900 Series Aggregation Services Routers as well as Cisco ASR 9902 and 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause network...

EUVD-2026-107359

A vulnerability in the IPv4 packet processing functionality of Cisco IOS XR Software that affects Cisco ASR 9000 and 9900 Series Aggregation Services Routers as well as Cisco ASR 9902 and 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause network...

CVE-2026-76505

A vulnerability exists in the IPv4 packet processing functionality of Cisco IOS XR Software affecting ASR 9000 and 9900 Series Aggregation Services Routers , as well as ASR 9902 and 9903 Compact High-Performance Routers . An unauthenticated, remote attacker can exploit incorrect handling of craft...

CVE-2026-76505 Cisco IOS XR Software for ASR 9000 Series Routers IPv4 Unicast Packets Denial of Service Vulnerability

A vulnerability in the IPv4 packet processing functionality of Cisco IOS XR Software that affects Cisco ASR 9000 and 9900 Series Aggregation Services Routers as well as Cisco ASR 9902 and 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause network...

PT-2026-120711

Name of the Vulnerable Software and Affected Versions Cisco IOS XR Software affected versions not specified Description An issue exists in the IPv4 packet processing functionality affecting Cisco ASR 9000 and 9900 Series Aggregation Services Routers, and Cisco ASR 9902 and 9903 Compact...

Cisco Advance Notification for Publication of October 21, 2026, Security Advisories

On October 21, 2026, the Cisco Product Security Incident Response Team PSIRT published the following advisories. To remediate the vulnerabilities that were disclosed on October 21, 2026, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. Fo...

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...

Cisco IOS XR Data Compromise

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...

Cisco IOS XR Data Compromise

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...

Cisco IOS XR Data Compromise

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...

Cisco IOS XR Data Compromise

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...

Cisco IOS XR Data Compromise

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...

Cisco IOS XR DoS

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...

Cisco IOS XR Resource Management Data Compromise

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...

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-2026-20277

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-2026-20280

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-2026-20278

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-2026-20274

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...