CVE-2026-20270
Cisco IOS XE Software Security Hardening Release
CVSS Score
8.6
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-682 |
| Vendor | cisco |
| Product | cisco ios xe software |
| Ecosystems | |
| Industries | NetworkingTelecommunications |
| Published | Aug 5, 2026 |
| Last Updated | Aug 5, 2026 |
Stay Ahead of the Next One
Get instant alerts for cisco cisco ios xe software
Be the first to know when new high vulnerabilities affecting cisco cisco ios xe software are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Cisco / Cisco IOS XE Software
17.2.1a 16.12.1y 16.12.3s 16.7.1b 16.6.2 16.6.5 16.12.1w 16.9.1d 17.3.1 16.9.4c 16.7.1 17.2.1 16.6.8 16.9.1b 16.9.2s 16.12.4 16.12.3a 17.1.1s 16.11.1a 16.7.2 16.11.1b 16.9.1s 16.9.3h 16.9.1c 16.6.5a 16.6.3 16.10.1f 17.2.1v 16.8.1e 16.9.3a 16.12.1a 16.12.1x 16.6.4s 16.10.1c 16.12.3 16.11.2 16.6.5b 16.12.2s 16.10.1b 16.7.3 16.6.7 16.9.6 16.9.2 16.10.1 16.12.1t 16.9.1 16.8.1a 16.9.3s 16.6.7a 16.12.2 16.11.1 16.9.3 16.11.1s 16.12.1 17.1.1 17.1.2 16.10.1d 17.1.1t 16.9.4 16.8.3 16.12.2t 16.9.5 16.8.1s 16.10.1e 16.8.2 16.6.4 16.8.1b 16.10.1a 16.12.1z 16.8.1c 16.9.1a 16.9.5f 16.6.4a 16.10.1g 16.8.1 16.6.6 16.9.2a 16.8.1d 16.10.3 16.7.1a 16.11.1c 16.10.1s 17.2.1r 17.1.1a 16.10.2 16.12.2a 16.12.1c 16.12.1s 16.7.4 17.2.2 16.9.8 16.9.7 17.1.3 17.3.1a 17.3.2a 16.12.5 17.3.1w 17.3.2 17.4.1 16.12.4a 17.4.1a 17.3.1x 17.3.3 16.6.9 17.2.3 17.5.1 16.12.1z1 16.12.5a 17.4.1b 17.3.1z 16.12.5b 17.4.2 17.3.3a 17.3.5 17.3.4 17.5.1a 16.12.6 17.6.1 16.12.1z2 16.6.10 17.3.4a 17.6.1a 17.7.1 17.6.1x 17.6.2 16.12.6a 17.3.4c 17.4.2a 17.3.4b 17.7.1a 16.12.7 17.8.1a 17.6.3a 17.6.3 17.7.2 17.7.1b 17.9.1w 17.3.5a 17.6.1z 16.12.8 17.8.1 17.9.1 17.6.4 17.3.5b 17.9.1a 17.3.6 17.10.1 16.9.8a 17.6.1z1 17.10.1a 17.9.2 17.6.5 17.9.1x 17.9.1y 16.9.8b 17.3.7 17.9.2a 17.9.3 16.12.9 17.11.1 17.10.1b 17.6.6 17.9.1x1 17.11.1a 17.9.3a 17.12.1 17.3.8 17.9.4 16.12.10 17.12.1w 17.9.1y1 17.12.1a 17.9.5 17.13.1 17.12.1x 17.12.2 17.14.1 17.9.4a 17.3.8a 17.6.6a 17.6.5a 17.6.7 16.12.10a 17.15.1 17.13.1a 17.12.2a 16.12.11 17.12.3 17.12.1y 17.12.1z 17.9.5a 17.14.1a 17.9.5b 17.6.8 16.12.12 17.12.4 17.9.6 17.17.1 17.16.1 17.15.1w 17.12.3a 17.9.5c 17.15.1a 17.12.1z1 17.15.2 17.15.1b 17.9.5d 17.15.1x 17.9.6a 17.12.1z2 17.6.8a 17.16.1a 16.12.13 17.15.3 17.9.7 17.12.5 17.15.1y 17.9.5e 17.12.4a 17.15.2a 17.15.2c 17.15.2b 17.12.1z3 17.9.5f 17.12.4b 17.12.5a 17.18.1 17.12.6 17.12.1z4 17.9.8 17.9.7a 17.15.3a 17.15.4 17.12.5b 17.15.3b 16.12.14 17.18.1z 17.9.7b 17.12.5c 26.1.1 17.18.1a 17.15.4a 17.18.2 17.18.1w 17.15.4b 17.12.6a 17.12.7 17.15.4c 17.9.9 17.12.5d 16.12.15 17.15.4s1 17.15.5 17.12.1z5 17.18.1x 17.12.1z6 17.15.4d 17.12.6b 17.4.1c 17.15.5a 17.18.1y 17.12.7a 17.18.3 17.12.7b 17.18.3a 26.1.1a 17.15.7 16.12.16