CVE-2026-20276Cisco IOS XR Software Security Hardening Release: September 2026
Updated under an hour ago ()
Does this affect you?
It affects Cisco IOS XR Software and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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-2026-20276 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) CWE-691.
- CVSS
- 8.6 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Weakness (CWE)
- CWE-691
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- cisco
- NVD analysis
- Analyzed
- Record last updated
- Sep 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cisco Cisco IOS XR Software cisco:ios_xr_software (from the name) | 6.5.29; 7.0.1; 6.5.26; 6.5.25; 6.5.28; 6.5.90; 7.1.1; 7.0.90; and 104 more ranges | CNA record |
cisco ios_xr cisco:ios_xr | 6.5.25; 6.5.26; 6.5.28; 6.5.29; 6.5.31; 6.5.32; 6.5.33; 6.5.35; and 103 more ranges | NVD |
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxr-qg64NcMvendor-advisory
- https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identificationnot-applicable
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.