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CVE-2026-20267 is a critical improper access control vulnerability in Cisco IOS XE Software. It represents multiple internally discovered access control weaknesses addressed through Cisco software hardening releases. The flaw class allows remote exploitation against affected IOS XE deployments and can result in authorization checks not being properly enforced, enabling access beyond intended permissions. Available reporting indicates the issue can permit complete bypass of authorization controls and unauthorized access to restricted resources. Cisco states the vulnerabilities were identified during an internal security review and remediated in hardened software releases.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical improper access control vulnerability in Cisco IOS XE with CVSS 9.0 that could impact authentication, authorization, privilege enforcement, or security-policy boundaries.
A critical vulnerability in Cisco IOS XE that could allow attackers to bypass authentication and execute arbitrary commands.
A critical improper access control vulnerability affecting Cisco IOS XE Software.
A high-severity improper access control vulnerability in Cisco IOS XE Software that could allow access beyond intended permissions.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.