CVE-2026-20280 Cisco IOS XR Software Security Hardening Release: September 2026
Cisco IOS XR contains improper handling of exceptional conditions that could lead to denial of service, requiring a security hardening patch.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20280?
CVE-2026-20280 is a high-severity vulnerability in Cisco Ios Xr, published on 2 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20280 are related to improper checking or handling of exceptional condition issues that are grouped under the Common Weakness Enumeration (CWE) CWE-703.
Weakness: CWE-703
Which versions are affected by CVE-2026-20280?
It affects 1 product.
Products include Cisco Ios Xr.
How do I fix CVE-2026-20280?
No fix has been published for CVE-2026-20280 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20280 being exploited?
There is no known exploitation of CVE-2026-20280 in the wild and no public exploit code.
Other vulnerabilities in Cisco Ios Xr
- CVE-2020-3118 Cisco IOS XR Software Discovery Protocol Format String
- CVE-2020-3569 Cisco IOS XR Software DVMRP Memory Exhaustion
- CVE-2020-3566 Cisco IOS XR Software DVMRP Memory Exhaustion
- CVE-2010-3035 Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service
- CVE-2022-20821 Cisco IOS XR Open Port
Sources
Also known as GHSA-h893-gcq5-j4cv.