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Vulnerability Intelligence Report
Cisco IOS XE Software Security Hardening Release

CVE-2026-20272

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-2026-20272 are related to issues with improper neutralization of special elements that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-74.

No Active Exploit Signals
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:0.34%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
Authentication
Weaponization
SSVC Action

Weaknesses (CWE)

CWE-74 ↗Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Affected Products & Versions

Vendor Product Affected Versions
Cisco Cisco IOS XE Software 17.2.1a (affected), 16.12.1y (affected), 16.12.3s (affected), 16.7.1b (affected), 16.6.2 (affected), 16.6.5 (affected), 16.12.1w (affected), 16.9.1d (affected), 17.3.1 (affected), 16.9.4c (affected), 16.7.1 (affected), 17.2.1 (affected), 16.6.8 (affected), 16.9.1b (affected), 16.9.2s (affected), 16.12.4 (affected), 16.12.3a (affected), 17.1.1s (affected), 16.11.1a (affected), 16.7.2 (affected), 16.11.1b (affected), 16.9.1s (affected), 16.9.3h (affected), 16.9.1c (affected), 16.6.5a (affected), 16.6.3 (affected), 16.10.1f (affected), 17.2.1v (affected), 16.8.1e (affected), 16.9.3a (affected), 16.12.1a (affected), 16.12.1x (affected), 16.6.4s (affected), 16.10.1c (affected), 16.12.3 (affected), 16.11.2 (affected), 16.6.5b (affected), 16.12.2s (affected), 16.10.1b (affected), 16.7.3 (affected), 16.6.7 (affected), 16.9.6 (affected), 16.9.2 (affected), 16.10.1 (affected), 16.12.1t (affected), 16.9.1 (affected), 16.8.1a (affected), 16.9.3s (affected), 16.6.7a (affected), 16.12.2 (affected), 16.11.1 (affected), 16.9.3 (affected), 16.11.1s (affected), 16.12.1 (affected), 17.1.1 (affected), 17.1.2 (affected), 16.10.1d (affected), 17.1.1t (affected), 16.9.4 (affected), 16.8.3 (affected), 16.12.2t (affected), 16.9.5 (affected), 16.8.1s (affected), 16.10.1e (affected), 16.8.2 (affected), 16.6.4 (affected), 16.8.1b (affected), 16.10.1a (affected), 16.12.1z (affected), 16.8.1c (affected), 16.9.1a (affected), 16.9.5f (affected), 16.6.4a (affected), 16.10.1g (affected), 16.8.1 (affected), 16.6.6 (affected), 16.9.2a (affected), 16.8.1d (affected), 16.10.3 (affected), 16.7.1a (affected), 16.11.1c (affected), 16.10.1s (affected), 17.2.1r (affected), 17.1.1a (affected), 16.10.2 (affected), 16.12.2a (affected), 16.12.1c (affected), 16.12.1s (affected), 16.7.4 (affected), 17.2.2 (affected), 16.9.8 (affected), 16.9.7 (affected), 17.1.3 (affected), 17.3.1a (affected), 17.3.2a (affected), 16.12.5 (affected), 17.3.1w (affected), 17.3.2 (affected), 17.4.1 (affected), 16.12.4a (affected), 17.4.1a (affected), 17.3.1x (affected), 17.3.3 (affected), 16.6.9 (affected), 17.2.3 (affected), 17.5.1 (affected), 16.12.1z1 (affected), 16.12.5a (affected), 17.4.1b (affected), 17.3.1z (affected), 16.12.5b (affected), 17.4.2 (affected), 17.3.3a (affected), 17.3.5 (affected), 17.3.4 (affected), 17.5.1a (affected), 16.12.6 (affected), 17.6.1 (affected), 16.12.1z2 (affected), 16.6.10 (affected), 17.3.4a (affected), 17.6.1a (affected), 17.7.1 (affected), 17.6.1x (affected), 17.6.2 (affected), 16.12.6a (affected), 17.3.4c (affected), 17.4.2a (affected), 17.3.4b (affected), 17.7.1a (affected), 16.12.7 (affected), 17.8.1a (affected), 17.6.3a (affected), 17.6.3 (affected), 17.7.2 (affected), 17.7.1b (affected), 17.9.1w (affected), 17.3.5a (affected), 17.6.1z (affected), 16.12.8 (affected), 17.8.1 (affected), 17.9.1 (affected), 17.6.4 (affected), 17.3.5b (affected), 17.9.1a (affected), 17.3.6 (affected), 17.10.1 (affected), 16.9.8a (affected), 17.6.1z1 (affected), 17.10.1a (affected), 17.9.2 (affected), 17.6.5 (affected), 17.9.1x (affected), 17.9.1y (affected), 16.9.8b (affected), 17.3.7 (affected), 17.9.2a (affected), 17.9.3 (affected), 16.12.9 (affected), 17.11.1 (affected), 17.10.1b (affected), 17.6.6 (affected), 17.9.1x1 (affected), 17.11.1a (affected), 17.9.3a (affected), 17.12.1 (affected), 17.3.8 (affected), 17.9.4 (affected), 16.12.10 (affected), 17.12.1w (affected), 17.9.1y1 (affected), 17.12.1a (affected), 17.9.5 (affected), 17.13.1 (affected), 17.12.1x (affected), 17.12.2 (affected), 17.14.1 (affected), 17.9.4a (affected), 17.3.8a (affected), 17.6.6a (affected), 17.6.5a (affected), 17.6.7 (affected), 16.12.10a (affected), 17.15.1 (affected), 17.13.1a (affected), 17.12.2a (affected), 16.12.11 (affected), 17.12.3 (affected), 17.12.1y (affected), 17.12.1z (affected), 17.9.5a (affected), 17.14.1a (affected), 17.9.5b (affected), 17.6.8 (affected), 16.12.12 (affected), 17.12.4 (affected), 17.9.6 (affected), 17.17.1 (affected), 17.16.1 (affected), 17.15.1w (affected), 17.12.3a (affected), 17.9.5c (affected), 17.15.1a (affected), 17.12.1z1 (affected), 17.15.2 (affected), 17.15.1b (affected), 17.9.5d (affected), 17.15.1x (affected), 17.9.6a (affected), 17.12.1z2 (affected), 17.6.8a (affected), 17.16.1a (affected), 16.12.13 (affected), 17.15.3 (affected), 17.9.7 (affected), 17.12.5 (affected), 17.15.1y (affected), 17.9.5e (affected), 17.12.4a (affected), 17.15.2a (affected), 17.15.2c (affected), 17.15.2b (affected), 17.12.1z3 (affected), 17.9.5f (affected), 17.12.4b (affected), 17.12.5a (affected), 17.18.1 (affected), 17.12.6 (affected), 17.12.1z4 (affected), 17.9.8 (affected), 17.9.7a (affected), 17.15.3a (affected), 17.15.4 (affected), 17.12.5b (affected), 17.15.3b (affected), 16.12.14 (affected), 17.18.1z (affected), 17.9.7b (affected), 17.12.5c (affected), 26.1.1 (affected), 17.18.1a (affected), 17.15.4a (affected), 17.18.2 (affected), 17.18.1w (affected), 17.15.4b (affected), 17.12.6a (affected), 17.12.7 (affected), 17.15.4c (affected), 17.9.9 (affected), 17.12.5d (affected), 16.12.15 (affected), 17.15.4s1 (affected), 17.15.5 (affected), 17.12.1z5 (affected), 17.18.1x (affected), 17.12.1z6 (affected), 17.15.4d (affected), 17.12.6b (affected), 17.4.1c (affected), 17.15.5a (affected), 17.18.1y (affected), 17.12.7a (affected), 17.18.3 (affected), 17.12.7b (affected), 17.18.3a (affected), 26.1.1a (affected), 17.15.7 (affected), 16.12.16 (affected)

References & Technical Advisories

No reference links found.

Threat Intelligence Signals

EPSS Score
0.343%

Identity & Timeline

StatusPUBLISHED
Assigning AuthorityCisco Systems, Inc. · Hosted Service · USA
Reserved2025-10-08T11:59:15
Published2026-08-05T16:19:26
Last Updated2026-08-14T21:00:51

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