by Kastro
Paper/Archive/CVE-2026-20272

CVE-2026-20272

Cisco Cisco IOS XE Software — Cisco IOS XE Software Security Hardening Release

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 47.3.473 × 209.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Cisco IOS XE Software17.2.1a–CNA
Cisco IOS XE Software16.12.1y–CNA
Cisco IOS XE Software16.12.3s–CNA
Cisco IOS XE Software16.7.1b–CNA
Cisco IOS XE Software16.6.2–CNA
Cisco IOS XE Software16.6.5–CNA
Cisco IOS XE Software16.12.1w–CNA
Cisco IOS XE Software16.9.1d–CNA
Cisco IOS XE Software17.3.1–CNA
Cisco IOS XE Software16.9.4c–CNA
Cisco IOS XE Software16.7.1–CNA
Cisco IOS XE Software17.2.1–CNA

Scores by source

cisco (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refsec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxe-V8NMuMZJrefcve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification