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CVE-2026-20272 is a critical Cisco IOS XE Software vulnerability record that tracks multiple internally discovered vulnerabilities addressed through Cisco software hardening releases. The issues are associated with improper neutralization of special elements, mapped to CWE-74, and are described as command injection flaws. The record covers multiple affected Cisco IOS XE Software release trains, including numerous 16.x and 17.x versions as well as 26.1.1 and 26.1.1a. The published CVSS v3.1 vector indicates remote exploitation over the network with low attack complexity, no privileges required, and no user interaction.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical Cisco IOS XE Software vulnerability involving improper neutralization of special elements, including command injection risks.
A critical Cisco IOS XE Software vulnerability involving improper neutralization of special elements, including command injection risks.
A critical Cisco IOS XE command injection vulnerability.
An injection vulnerability in Cisco IOS XE Software.
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.