CVE-2026-20271NVD

Vulnerability Summary

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-2026-20271 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-691.

Severity Level

HIGH(8.6)

Published Date

Aug 5, 2026

Last Modified

Oct 3, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.47%Probability

Root Weakness (CWE)

CWE-691: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v3.1 Base Metrics — Score 8.6 (HIGH)

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

ConfidentialityNone

IntegrityNone

AvailabilityHigh

Affected & Patched Versions

Affected Versions

Cisco Ios Xe

Patched Versions

Not provided by NVD for this CVE.

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