DoS in Snort 3 Detection Engine via JSTokenizer HTTP JavaScript normalization
Multiple Cisco products are affected by a denial-of-service vulnerability in the Snort 3 Detection Engine. The issue is caused by an error in the JSTokenizer normalization logic used when the HTTP inspection component normalizes JavaScript. An unauthenticated remote attacker can trigger an unexpected restart of the Snort 3 Detection Engine by sending crafted HTTP packets over an established connection that is parsed by Snort 3, interrupting packet inspection. JSTokenizer is not enabled by default.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
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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.