Insufficient Control Flow Management in Cisco IOS XE Software
CVE-2026-20271

8.6HIGH

Key Information:

Vendor

Cisco
Status
Cisco iOS Xe Software
Vendor
CVE Published:
5 August 2026

Badges

👾 Exploit Exists

What is CVE-2026-20271?

The vulnerability is linked to insufficient management of control flow within Cisco IOS XE Software, revealing potential exposure to unauthorized access or system malfunction. Following an extensive internal security review, Cisco has introduced software hardening updates aimed at mitigating these issues. This vulnerability falls under the Common Weakness Enumeration category CWE-691, highlighting the significance of proper control flow management in safeguarding network hardware and software.

Affected Version(s)

Cisco IOS XE Software 17.2.1a

Cisco IOS XE Software 16.12.1y

Cisco IOS XE Software 16.12.3s

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
8.6
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.