CVE-2026-20270
Received Received - Intake

Incorrect Calculation Issue in Cisco IOS XE Software

Publication date: 2026-08-05

Last updated on: 2026-08-05

Assigner: Cisco Systems, Inc.

Description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20270 are related to incorrect calculation issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-682.

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Meta Information

Published
2026-08-05
Last Modified
2026-08-05
Generated
2026-08-05
AI Q&A
2026-08-05
EPSS Evaluated
N/A
NVD
CVE-2026-20270
EUVD
EUVD-2026-53456

Affected Vendors & Products

Showing 7 associated CPEs
Vendor Product Version / Range
cisco ios_xe *
cisco ios_xe 17.9.10
cisco ios_xe 17.12.8
cisco ios_xe 17.15.6
cisco ios_xe 17.18.4
cisco ios_xe 26.1.2
cisco ios_xe From 17.9 (inc) to 26.1 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-682 The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management.

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Executive Summary

This vulnerability is related to incorrect calculation issues in Cisco IOS XE Software, identified under CWE-682. It was discovered during Cisco's internal security review and affects multiple products.

Detection Guidance

The provided CVE data does not include specific detection methods or commands for CVE-2026-20270. Detection would typically involve checking Cisco IOS XE Software versions against fixed releases and monitoring for unusual behavior related to incorrect calculation issues under CWE-682.

Impact Analysis

The vulnerability has a high impact on availability (A:H) with a CVSS score of 8.6. It could lead to system crashes or denial of service due to incorrect calculations in the software.

Compliance Impact

The provided CVE data does not specify direct impacts on compliance with standards like GDPR or HIPAA. The vulnerability involves incorrect calculation issues (CWE-682) in Cisco IOS XE Software, which may lead to availability impacts (CVSS 8.6). Compliance implications would depend on specific system configurations and data processing contexts.

Mitigation Strategies

Update Cisco IOS XE Software to the latest hardened release provided by Cisco to address the incorrect calculation issues. Monitor Cisco's security advisories for patches and apply them promptly.

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