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CVE-2026-20188 is a denial-of-service condition affecting Cisco Crosswork Network Controller and Cisco Network Services Orchestrator. The issue was initially described as stemming from insufficient rate limiting or improper limitation of incoming connection handling, which could allow an unauthenticated remote attacker to send a large volume of valid connection requests and exhaust available connection resources. Successful exploitation could cause the affected system to become completely unresponsive and require a manual reboot to restore service. Affected releases include Cisco Crosswork Network Controller 7.1 and earlier, and Cisco Network Services Orchestrator releases prior to fixed versions in the 6.4 train and later unaffected branches. However, Cisco subsequently reclassified this issue as a customer-configurable resource management issue rather than a security vulnerability.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
High-severity denial-of-service vulnerability in Cisco Crosswork Network Controller and Cisco Network Services Orchestrator caused by improper implementation of incoming connection limiting, allowing unauthenticated remote attackers to exhaust network connections and render devices unresponsive until manually rebooted.
A high-severity uncontrolled resource consumption vulnerability in Cisco Crosswork Network Controller (CNC) and Cisco Network Services Orchestrator (NSO) that allows unauthenticated remote attackers to cause a denial-of-service condition by exhausting connection resources.
An unauthenticated network-reachable denial-of-service vulnerability caused by uncontrolled resource consumption in Cisco Crosswork Network Controller and Cisco Network Services Orchestrator due to missing connection rate limiting.
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.