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CVE-2026-20267 is a critical vulnerability record for Cisco IOS XE Software that covers multiple internally discovered improper access control issues addressed through Cisco software hardening releases. The weaknesses allow authorization checks to be bypassed, resulting in access beyond intended permissions to restricted resources or functions. Available vendor and secondary reporting characterize the issue as remotely exploitable, unauthenticated, and requiring no user interaction, with a CVSS v3.1 vector of AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H. The affected software includes Cisco IOS XE releases running in autonomous mode or controller mode across numerous release trains prior to the fixed versions.
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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.
19 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.