CVE-2026-20270 Cisco IOS XE Software Security Hardening Release
Cisco IOS XE contains incorrect calculation flaws that require patching to ensure system stability and security.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20270?
CVE-2026-20270 is a high-severity vulnerability in Cisco Ios Xe, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-682
Which versions are affected by CVE-2026-20270?
It affects 1 product.
Products include Cisco Ios Xe.
How do I fix CVE-2026-20270?
No fix has been published for CVE-2026-20270 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20270 being exploited?
There is no known exploitation of CVE-2026-20270 in the wild and no public exploit code.
Other vulnerabilities in Cisco Ios Xe
- CVE-2023-20198 Cisco IOS XE Web UI Privilege Escalation
- CVE-2018-0151 Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution
- CVE-2023-20273 Cisco IOS XE Web UI Command Injection
- CVE-2025-20188 Hardcoded credentials in Cisco IOS XE Software
- CVE-2021-34770 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Remote Code Execution Vulnerability
Sources
Also known as GHSA-jmg2-f5xg-mf62.