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CVE-2026-20273 is a high-severity vulnerability record for Cisco IOS XE Software that covers multiple internally discovered improper input validation flaws addressed through a Cisco software hardening release. The issue is remotely exploitable over the network with low attack complexity, requires no privileges, and does not require user interaction. Available reporting associates the weakness class with improper input validation and notes potential manifestations including path traversal and unsafe external path handling. Cisco characterizes the issue as affecting Cisco IOS XE Software running in autonomous mode or controller mode across affected release trains.
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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.
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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.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An improper input validation vulnerability affecting Cisco IOS XE Software.
A Cisco IOS XE Software improper input validation vulnerability with potential path traversal impacts.
A Cisco IOS XE Software improper input validation vulnerability with potential path traversal impact.
An improper input validation 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.