What is CVE-2026-20268?

CVE-2026-20268 is a high-severity vulnerability in Cisco Ios Xe Software, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.6/10. Published 2026-08-05.

How severe is CVE-2026-20268?

High severity. CVSS v3 base score is 8.6 out of 10.

Buffer overflow in Cisco Ios Xe Software

CVE-2026-20268

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 ad…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Cisco Ios Xe Software — versions 17.2.1a, 16.12.1y, 16.12.3s

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

psirt@cisco.com

Frequently asked questions

What is CVE-2026-20268?: CVE-2026-20268 is a high-severity vulnerability in Cisco Ios Xe Software, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.6/10. Published 2026-08-05.
How severe is CVE-2026-20268?: High severity. CVSS v3 base score is 8.6 out of 10.