CVE-2026-20270
8.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Cisco | Cisco IOS XE Software | 17.2.1a | affected |
| Cisco | Cisco IOS XE Software | 16.12.1y | affected |
| Cisco | Cisco IOS XE Software | 16.12.3s | affected |
| Cisco | Cisco IOS XE Software | 16.7.1b | affected |
| Cisco | Cisco IOS XE Software | 16.6.2 | affected |
| Cisco | Cisco IOS XE Software | 16.6.5 | affected |
| Cisco | Cisco IOS XE Software | 16.12.1w | affected |
| Cisco | Cisco IOS XE Software | 16.9.1d | affected |
| Cisco | Cisco IOS XE Software | 17.3.1 | affected |
| Cisco | Cisco IOS XE Software | 16.9.4c | affected |
| Cisco | Cisco IOS XE Software | 16.7.1 | affected |
| Cisco | Cisco IOS XE Software | 17.2.1 | affected |
| Cisco | Cisco IOS XE Software | 16.6.8 | affected |
| Cisco | Cisco IOS XE Software | 16.9.1b | affected |
| Cisco | Cisco IOS XE Software | 16.9.2s | affected |
| Cisco | Cisco IOS XE Software | 16.12.4 | affected |
| Cisco | Cisco IOS XE Software | 16.12.3a | affected |
| Cisco | Cisco IOS XE Software | 17.1.1s | affected |
| Cisco | Cisco IOS XE Software | 16.11.1a | affected |
| Cisco | Cisco IOS XE Software | 16.7.2 | affected |
| Cisco | Cisco IOS XE Software | 16.11.1b | affected |
| Cisco | Cisco IOS XE Software | 16.9.1s | affected |
| Cisco | Cisco IOS XE Software | 16.9.3h | affected |
| Cisco | Cisco IOS XE Software | 16.9.1c | affected |
| Cisco | Cisco IOS XE Software | 16.6.5a | affected |
| Cisco | Cisco IOS XE Software | 16.6.3 | affected |
| Cisco | Cisco IOS XE Software | 16.10.1f | affected |
| Cisco | Cisco IOS XE Software | 17.2.1v | affected |
| Cisco | Cisco IOS XE Software | 16.8.1e | affected |
| Cisco | Cisco IOS XE Software | 16.9.3a | affected |
| Cisco | Cisco IOS XE Software | 16.12.1a | affected |
| Cisco | Cisco IOS XE Software | 16.12.1x | affected |
| Cisco | Cisco IOS XE Software | 16.6.4s | affected |
| Cisco | Cisco IOS XE Software | 16.10.1c | affected |
| Cisco | Cisco IOS XE Software | 16.12.3 | affected |
| Cisco | Cisco IOS XE Software | 16.11.2 | affected |
| Cisco | Cisco IOS XE Software | 16.6.5b | affected |
| Cisco | Cisco IOS XE Software | 16.12.2s | affected |
| Cisco | Cisco IOS XE Software | 16.10.1b | affected |
| Cisco | Cisco IOS XE Software | 16.7.3 | affected |
| Cisco | Cisco IOS XE Software | 16.6.7 | affected |
| Cisco | Cisco IOS XE Software | 16.9.6 | affected |
| Cisco | Cisco IOS XE Software | 16.9.2 | affected |
| Cisco | Cisco IOS XE Software | 16.10.1 | affected |
| Cisco | Cisco IOS XE Software | 16.12.1t | affected |
| Cisco | Cisco IOS XE Software | 16.9.1 | affected |
| Cisco | Cisco IOS XE Software | 16.8.1a | affected |
| Cisco | Cisco IOS XE Software | 16.9.3s | affected |
| Cisco | Cisco IOS XE Software | 16.6.7a | affected |
| Cisco | Cisco IOS XE Software | 16.12.2 | affected |
| Cisco | Cisco IOS XE Software | 16.11.1 | affected |
| Cisco | Cisco IOS XE Software | 16.9.3 | affected |
| Cisco | Cisco IOS XE Software | 16.11.1s | affected |
| Cisco | Cisco IOS XE Software | 16.12.1 | affected |
| Cisco | Cisco IOS XE Software | 17.1.1 | affected |
| Cisco | Cisco IOS XE Software | 17.1.2 | affected |
| Cisco | Cisco IOS XE Software | 16.10.1d | affected |
| Cisco | Cisco IOS XE Software | 17.1.1t | affected |
| Cisco | Cisco IOS XE Software | 16.9.4 | affected |
| Cisco | Cisco IOS XE Software | 16.8.3 | affected |
| Cisco | Cisco IOS XE Software | 16.12.2t | affected |
| Cisco | Cisco IOS XE Software | 16.9.5 | affected |
| Cisco | Cisco IOS XE Software | 16.8.1s | affected |
| Cisco | Cisco IOS XE Software | 16.10.1e | affected |
| Cisco | Cisco IOS XE Software | 16.8.2 | affected |
| Cisco | Cisco IOS XE Software | 16.6.4 | affected |
| Cisco | Cisco IOS XE Software | 16.8.1b | affected |
| Cisco | Cisco IOS XE Software | 16.10.1a | affected |
| Cisco | Cisco IOS XE Software | 16.12.1z | affected |
| Cisco | Cisco IOS XE Software | 16.8.1c | affected |
| Cisco | Cisco IOS XE Software | 16.9.1a | affected |
| Cisco | Cisco IOS XE Software | 16.9.5f | affected |
| Cisco | Cisco IOS XE Software | 16.6.4a | affected |
| Cisco | Cisco IOS XE Software | 16.10.1g | affected |
| Cisco | Cisco IOS XE Software | 16.8.1 | affected |
| Cisco | Cisco IOS XE Software | 16.6.6 | affected |
| Cisco | Cisco IOS XE Software | 16.9.2a | affected |
| Cisco | Cisco IOS XE Software | 16.8.1d | affected |
| Cisco | Cisco IOS XE Software | 16.10.3 | affected |
| Cisco | Cisco IOS XE Software | 16.7.1a | affected |
| Cisco | Cisco IOS XE Software | 16.11.1c | affected |
| Cisco | Cisco IOS XE Software | 16.10.1s | affected |
| Cisco | Cisco IOS XE Software | 17.2.1r | affected |
| Cisco | Cisco IOS XE Software | 17.1.1a | affected |
| Cisco | Cisco IOS XE Software | 16.10.2 | affected |
| Cisco | Cisco IOS XE Software | 16.12.2a | affected |
| Cisco | Cisco IOS XE Software | 16.12.1c | affected |
| Cisco | Cisco IOS XE Software | 16.12.1s | affected |
| Cisco | Cisco IOS XE Software | 16.7.4 | affected |
| Cisco | Cisco IOS XE Software | 17.2.2 | affected |
| Cisco | Cisco IOS XE Software | 16.9.8 | affected |
| Cisco | Cisco IOS XE Software | 16.9.7 | affected |
| Cisco | Cisco IOS XE Software | 17.1.3 | affected |
| Cisco | Cisco IOS XE Software | 17.3.1a | affected |
| Cisco | Cisco IOS XE Software | 17.3.2a | affected |
| Cisco | Cisco IOS XE Software | 16.12.5 | affected |
| Cisco | Cisco IOS XE Software | 17.3.1w | affected |
| Cisco | Cisco IOS XE Software | 17.3.2 | affected |
| Cisco | Cisco IOS XE Software | 17.4.1 | affected |
| Cisco | Cisco IOS XE Software | 16.12.4a | affected |
| Cisco | Cisco IOS XE Software | 17.4.1a | affected |
| Cisco | Cisco IOS XE Software | 17.3.1x | affected |
| Cisco | Cisco IOS XE Software | 17.3.3 | affected |
| Cisco | Cisco IOS XE Software | 16.6.9 | affected |
| Cisco | Cisco IOS XE Software | 17.2.3 | affected |
| Cisco | Cisco IOS XE Software | 17.5.1 | affected |
| Cisco | Cisco IOS XE Software | 16.12.1z1 | affected |
| Cisco | Cisco IOS XE Software | 16.12.5a | affected |
| Cisco | Cisco IOS XE Software | 17.4.1b | affected |
| Cisco | Cisco IOS XE Software | 17.3.1z | affected |
| Cisco | Cisco IOS XE Software | 16.12.5b | affected |
| Cisco | Cisco IOS XE Software | 17.4.2 | affected |
| Cisco | Cisco IOS XE Software | 17.3.3a | affected |
| Cisco | Cisco IOS XE Software | 17.3.5 | affected |
| Cisco | Cisco IOS XE Software | 17.3.4 | affected |
| Cisco | Cisco IOS XE Software | 17.5.1a | affected |
| Cisco | Cisco IOS XE Software | 16.12.6 | affected |
| Cisco | Cisco IOS XE Software | 17.6.1 | affected |
| Cisco | Cisco IOS XE Software | 16.12.1z2 | affected |
| Cisco | Cisco IOS XE Software | 16.6.10 | affected |
| Cisco | Cisco IOS XE Software | 17.3.4a | affected |
| Cisco | Cisco IOS XE Software | 17.6.1a | affected |
| Cisco | Cisco IOS XE Software | 17.7.1 | affected |
| Cisco | Cisco IOS XE Software | 17.6.1x | affected |
| Cisco | Cisco IOS XE Software | 17.6.2 | affected |
| Cisco | Cisco IOS XE Software | 16.12.6a | affected |
| Cisco | Cisco IOS XE Software | 17.3.4c | affected |
| Cisco | Cisco IOS XE Software | 17.4.2a | affected |
| Cisco | Cisco IOS XE Software | 17.3.4b | affected |
| Cisco | Cisco IOS XE Software | 17.7.1a | affected |
| Cisco | Cisco IOS XE Software | 16.12.7 | affected |
| Cisco | Cisco IOS XE Software | 17.8.1a | affected |
| Cisco | Cisco IOS XE Software | 17.6.3a | affected |
| Cisco | Cisco IOS XE Software | 17.6.3 | affected |
| Cisco | Cisco IOS XE Software | 17.7.2 | affected |
| Cisco | Cisco IOS XE Software | 17.7.1b | affected |
| Cisco | Cisco IOS XE Software | 17.9.1w | affected |
| Cisco | Cisco IOS XE Software | 17.3.5a | affected |
| Cisco | Cisco IOS XE Software | 17.6.1z | affected |
| Cisco | Cisco IOS XE Software | 16.12.8 | affected |
| Cisco | Cisco IOS XE Software | 17.8.1 | affected |
| Cisco | Cisco IOS XE Software | 17.9.1 | affected |
| Cisco | Cisco IOS XE Software | 17.6.4 | affected |
| Cisco | Cisco IOS XE Software | 17.3.5b | affected |
| Cisco | Cisco IOS XE Software | 17.9.1a | affected |
| Cisco | Cisco IOS XE Software | 17.3.6 | affected |
| Cisco | Cisco IOS XE Software | 17.10.1 | affected |
| Cisco | Cisco IOS XE Software | 16.9.8a | affected |
| Cisco | Cisco IOS XE Software | 17.6.1z1 | affected |
| Cisco | Cisco IOS XE Software | 17.10.1a | affected |
| Cisco | Cisco IOS XE Software | 17.9.2 | affected |
| Cisco | Cisco IOS XE Software | 17.6.5 | affected |
| Cisco | Cisco IOS XE Software | 17.9.1x | affected |
| Cisco | Cisco IOS XE Software | 17.9.1y | affected |
| Cisco | Cisco IOS XE Software | 16.9.8b | affected |
| Cisco | Cisco IOS XE Software | 17.3.7 | affected |
| Cisco | Cisco IOS XE Software | 17.9.2a | affected |
| Cisco | Cisco IOS XE Software | 17.9.3 | affected |
| Cisco | Cisco IOS XE Software | 16.12.9 | affected |
| Cisco | Cisco IOS XE Software | 17.11.1 | affected |
| Cisco | Cisco IOS XE Software | 17.10.1b | affected |
| Cisco | Cisco IOS XE Software | 17.6.6 | affected |
| Cisco | Cisco IOS XE Software | 17.9.1x1 | affected |
| Cisco | Cisco IOS XE Software | 17.11.1a | affected |
| Cisco | Cisco IOS XE Software | 17.9.3a | affected |
| Cisco | Cisco IOS XE Software | 17.12.1 | affected |
| Cisco | Cisco IOS XE Software | 17.3.8 | affected |
| Cisco | Cisco IOS XE Software | 17.9.4 | affected |
| Cisco | Cisco IOS XE Software | 16.12.10 | affected |
| Cisco | Cisco IOS XE Software | 17.12.1w | affected |
| Cisco | Cisco IOS XE Software | 17.9.1y1 | affected |
| Cisco | Cisco IOS XE Software | 17.12.1a | affected |
| Cisco | Cisco IOS XE Software | 17.9.5 | affected |
| Cisco | Cisco IOS XE Software | 17.13.1 | affected |
| Cisco | Cisco IOS XE Software | 17.12.1x | affected |
| Cisco | Cisco IOS XE Software | 17.12.2 | affected |
| Cisco | Cisco IOS XE Software | 17.14.1 | affected |
| Cisco | Cisco IOS XE Software | 17.9.4a | affected |
| Cisco | Cisco IOS XE Software | 17.3.8a | affected |
| Cisco | Cisco IOS XE Software | 17.6.6a | affected |
| Cisco | Cisco IOS XE Software | 17.6.5a | affected |
| Cisco | Cisco IOS XE Software | 17.6.7 | affected |
| Cisco | Cisco IOS XE Software | 16.12.10a | affected |
| Cisco | Cisco IOS XE Software | 17.15.1 | affected |
| Cisco | Cisco IOS XE Software | 17.13.1a | affected |
| Cisco | Cisco IOS XE Software | 17.12.2a | affected |
| Cisco | Cisco IOS XE Software | 16.12.11 | affected |
| Cisco | Cisco IOS XE Software | 17.12.3 | affected |
| Cisco | Cisco IOS XE Software | 17.12.1y | affected |
| Cisco | Cisco IOS XE Software | 17.12.1z | affected |
| Cisco | Cisco IOS XE Software | 17.9.5a | affected |
| Cisco | Cisco IOS XE Software | 17.14.1a | affected |
| Cisco | Cisco IOS XE Software | 17.9.5b | affected |
| Cisco | Cisco IOS XE Software | 17.6.8 | affected |
| Cisco | Cisco IOS XE Software | 16.12.12 | affected |
| Cisco | Cisco IOS XE Software | 17.12.4 | affected |
| Cisco | Cisco IOS XE Software | 17.9.6 | affected |
| Cisco | Cisco IOS XE Software | 17.17.1 | affected |
| Cisco | Cisco IOS XE Software | 17.16.1 | affected |
| Cisco | Cisco IOS XE Software | 17.15.1w | affected |
| Cisco | Cisco IOS XE Software | 17.12.3a | affected |
| Cisco | Cisco IOS XE Software | 17.9.5c | affected |
| Cisco | Cisco IOS XE Software | 17.15.1a | affected |
| Cisco | Cisco IOS XE Software | 17.12.1z1 | affected |
| Cisco | Cisco IOS XE Software | 17.15.2 | affected |
| Cisco | Cisco IOS XE Software | 17.15.1b | affected |
| Cisco | Cisco IOS XE Software | 17.9.5d | affected |
| Cisco | Cisco IOS XE Software | 17.15.1x | affected |
| Cisco | Cisco IOS XE Software | 17.9.6a | affected |
| Cisco | Cisco IOS XE Software | 17.12.1z2 | affected |
| Cisco | Cisco IOS XE Software | 17.6.8a | affected |
| Cisco | Cisco IOS XE Software | 17.16.1a | affected |
| Cisco | Cisco IOS XE Software | 16.12.13 | affected |
| Cisco | Cisco IOS XE Software | 17.15.3 | affected |
| Cisco | Cisco IOS XE Software | 17.9.7 | affected |
| Cisco | Cisco IOS XE Software | 17.12.5 | affected |
| Cisco | Cisco IOS XE Software | 17.15.1y | affected |
| Cisco | Cisco IOS XE Software | 17.9.5e | affected |
| Cisco | Cisco IOS XE Software | 17.12.4a | affected |
| Cisco | Cisco IOS XE Software | 17.15.2a | affected |
| Cisco | Cisco IOS XE Software | 17.15.2c | affected |
| Cisco | Cisco IOS XE Software | 17.15.2b | affected |
| Cisco | Cisco IOS XE Software | 17.12.1z3 | affected |
| Cisco | Cisco IOS XE Software | 17.9.5f | affected |
| Cisco | Cisco IOS XE Software | 17.12.4b | affected |
| Cisco | Cisco IOS XE Software | 17.12.5a | affected |
| Cisco | Cisco IOS XE Software | 17.18.1 | affected |
| Cisco | Cisco IOS XE Software | 17.12.6 | affected |
| Cisco | Cisco IOS XE Software | 17.12.1z4 | affected |
| Cisco | Cisco IOS XE Software | 17.9.8 | affected |
| Cisco | Cisco IOS XE Software | 17.9.7a | affected |
| Cisco | Cisco IOS XE Software | 17.15.3a | affected |
| Cisco | Cisco IOS XE Software | 17.15.4 | affected |
| Cisco | Cisco IOS XE Software | 17.12.5b | affected |
| Cisco | Cisco IOS XE Software | 17.15.3b | affected |
| Cisco | Cisco IOS XE Software | 16.12.14 | affected |
| Cisco | Cisco IOS XE Software | 17.18.1z | affected |
| Cisco | Cisco IOS XE Software | 17.9.7b | affected |
| Cisco | Cisco IOS XE Software | 17.12.5c | affected |
| Cisco | Cisco IOS XE Software | 26.1.1 | affected |
| Cisco | Cisco IOS XE Software | 17.18.1a | affected |
| Cisco | Cisco IOS XE Software | 17.15.4a | affected |
| Cisco | Cisco IOS XE Software | 17.18.2 | affected |
| Cisco | Cisco IOS XE Software | 17.18.1w | affected |
| Cisco | Cisco IOS XE Software | 17.15.4b | affected |
| Cisco | Cisco IOS XE Software | 17.12.6a | affected |
| Cisco | Cisco IOS XE Software | 17.12.7 | affected |
| Cisco | Cisco IOS XE Software | 17.15.4c | affected |
| Cisco | Cisco IOS XE Software | 17.9.9 | affected |
| Cisco | Cisco IOS XE Software | 17.12.5d | affected |
| Cisco | Cisco IOS XE Software | 16.12.15 | affected |
| Cisco | Cisco IOS XE Software | 17.15.4s1 | affected |
| Cisco | Cisco IOS XE Software | 17.15.5 | affected |
| Cisco | Cisco IOS XE Software | 17.12.1z5 | affected |
| Cisco | Cisco IOS XE Software | 17.18.1x | affected |
| Cisco | Cisco IOS XE Software | 17.12.1z6 | affected |
| Cisco | Cisco IOS XE Software | 17.15.4d | affected |
| Cisco | Cisco IOS XE Software | 17.12.6b | affected |
| Cisco | Cisco IOS XE Software | 17.4.1c | affected |
| Cisco | Cisco IOS XE Software | 17.15.5a | affected |
| Cisco | Cisco IOS XE Software | 17.18.1y | affected |
| Cisco | Cisco IOS XE Software | 17.12.7a | affected |
| Cisco | Cisco IOS XE Software | 17.18.3 | affected |
| Cisco | Cisco IOS XE Software | 17.12.7b | affected |
| Cisco | Cisco IOS XE Software | 17.18.3a | affected |
| Cisco | Cisco IOS XE Software | 26.1.1a | affected |
| Cisco | Cisco IOS XE Software | 17.15.7 | affected |
| Cisco | Cisco IOS XE Software | 16.12.16 | affected |
Weaknesses
- CWE-682: Incorrect Calculation
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
References
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