Cisco IOS XR Software up to 26.2.101 neutralization

Summaryinfo

A vulnerability categorized as very critical has been discovered in Cisco IOS XR Software. Impacted is an unknown function. The manipulation results in neutralization. This vulnerability was named CVE-2026-20278. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Cisco IOS XR Software. It has been classified as very critical. Affected is an unknown functionality. The manipulation with an unknown input leads to a neutralization vulnerability. CWE is classifying the issue as CWE-707. The product does not ensure or incorrectly ensures that structured messages or data are well-formed and that certain security properties are met before being read from an upstream component or sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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. The vulnerabilities tracked by CVE-2026-20278 are related to improper neutralization issues that are grouped under the Common Weakness Enumeration (CWE) CWE-707.

The advisory is available at sec.cloudapps.cisco.com. This vulnerability is traded as CVE-2026-20278 since 10/08/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/02/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• IOS XR Software

Version

• 6.5.25
• 6.5.26
• 6.5.28
• 6.5.29
• 6.5.31
• 6.5.32
• 6.5.33
• 6.5.35
• 6.5.90
• 6.5.351
• 6.5.352
• 6.5.353
• 6.7.1
• 6.7.2
• 6.7.3
• 6.7.4
• 6.7.35
• 6.8.1
• 6.8.2
• 6.9.1
• 6.9.2
• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.11
• 7.0.12
• 7.0.14
• 7.0.90
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.15
• 7.1.25
• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.12
• 7.3.1
• 7.3.2
• 7.3.3
• 7.3.4
• 7.3.5
• 7.3.6
• 7.3.15
• 7.3.16
• 7.3.27
• 7.4.1
• 7.4.2
• 7.4.15
• 7.4.16
• 7.5.1
• 7.5.2
• 7.5.3
• 7.5.4
• 7.5.5
• 7.5.12
• 7.5.52
• 7.6.1
• 7.6.2
• 7.6.3
• 7.6.15
• 7.7.1
• 7.7.2
• 7.7.21
• 7.8.1
• 7.8.2
• 7.8.12
• 7.8.22
• 7.8.23
• 7.9.1
• 7.9.2
• 7.9.21
• 7.10.1
• 7.10.2
• 7.11.1
• 7.11.2
• 7.11.21
• 24.1.1
• 24.1.2
• 24.2.1
• 24.2.2
• 24.2.11
• 24.2.20
• 24.2.21
• 24.3.1
• 24.3.2
• 24.3.20
• 24.3.30
• 24.4.1
• 24.4.2
• 24.4.10
• 24.4.15
• 24.4.30
• 25.1.1
• 25.1.2
• 25.1.30
• 25.2.1
• 25.2.2
• 25.2.15
• 25.2.30
• 25.3.1
• 25.3.15
• 25.4.1
• 25.4.2
• 25.4.30
• 25.4.201
• 26.1.1
• 26.1.2
• 26.2.1
• 26.2.100
• 26.2.101

License

• commercial

Website

• Vendor: https://www.cisco.com/

CPE 2.3info

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