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.
Published: 2026-09-02
Score: 8.8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The vulnerabilities tracked by CVE-2026-20280 are caused by improper checking or handling of exceptional conditions, a weakness identified as CWE‑703. This may lead to abnormal or unintended behavior in Cisco IOS XR Software, which could destabilize or disrupt network functions. The CVSS score of 8.8 indicates a high severity potential impact.

Affected Systems

Affected products include Cisco IOS XR Software. No specific minor version details were listed, so all deployments of this software could be vulnerable until the hardening release is applied.

Risk and Exploitability

The CVSS score of 8.8 signals a high risk impact, but the EPSS score is not available and the vulnerability is not currently listed in CISA's KEV catalog. The likely attack vector involves an attacker triggering an exceptional condition by sending crafted network packets or manipulating configuration inputs to cause the software to misbehave. While no public exploit has been reported, the inherent severity and the absence of mitigation in existing releases suggest that the threat remains significant until the hardening release is installed.

Generated by OpenCVE AI on September 3, 2026 at 09:14 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the Cisco IOS XR hardening release described in the security advisory to correct the exception handling flaw.
  • Audit router configurations and traffic logs to confirm that no unexpected exceptions are occurring after the update.
  • Implement network segmentation and firewall policies to restrict access to the IOS XR management interfaces, reducing the opportunity to trigger exceptional conditions.

Generated by OpenCVE AI on September 3, 2026 at 09:14 UTC.

Tracking

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Advisories

No advisories yet.

History

Thu, 03 Sep 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Cisco
Cisco ios Xr Software
Vendors & Products Cisco
Cisco ios Xr Software

Thu, 03 Sep 2026 05:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 02 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Description As part of Cisco's ongoing commitment to proactive security and product quality, the&nbsp;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.
Title Cisco IOS XR Software Security Hardening Release: September 2026
Weaknesses CWE-703
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Subscriptions

Cisco Ios Xr Software
cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-09-03T03:56:28.536Z

Reserved: 2025-10-08T11:59:15.403Z

Link: CVE-2026-20280

cve-icon Vulnrichment

Updated: 2026-09-02T17:56:42.587Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-02T17:17:33.580

Modified: 2026-09-03T13:04:39.930

Link: CVE-2026-20280

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-03T15:30:05Z

Weaknesses
  • CWE-703

    Improper Check or Handling of Exceptional Conditions