Cisco IOS Web UI Denial of Service via Crafted URL
CVE-2025-20327 is a denial-of-service vulnerability in the web UI of Cisco IOS Software affecting Cisco IOS industrial switch platforms. According to the provided content, the flaw is caused by improper input validation in the web interface. An authenticated remote attacker with low privileges can exploit the issue by sending a crafted URL in an HTTP request to the affected device. Successful exploitation causes the device to reload, resulting in a denial-of-service condition.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Recent activity
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability affecting Cisco IOS industrial switches.
A denial-of-service vulnerability affecting Cisco IOS industrial switches.
The version that knows your environment.
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.