New Cisco Network Vulnerability Let Remote Attacker Cause DoS Attack

Cybersecuritynews •Abinaya • May 7, 2026

Cisco has issued a critical security advisory regarding a high-severity vulnerability impacting its Crosswork Network Controller (CNC) and Network Services Orchestrator (NSO). Tracked formally as CVE-2026-20188 with a CVSS base score of 7.5, this flaw poses a significant risk to network infrastructure. If successfully exploited, the vulnerability allows unauthenticated, remote attackers to trigger a severe […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Cisco DoS Vulnerability CVE-2026-20188 Requires Manual Reboot for Recovery Cisco has disclosed a high-severity denial-of-service (DoS) vulnerability tracked as CVE-2026-20188 affecting the Crosswork Network Controller (CNC) and Network Services Orchestrator (NSO). The flaw arises from inadequate rate limiting on incoming connections, allowing unauthenticated remote attackers to exhaust connection resources, leading to system unresponsiveness. Affected systems require a manual reboot to recover from the DoS condition. Cisco has not reported any active exploitation of this vulnerability at this time. The vulnerability carries a CVSS base score of 7.5, indicating significant risk to network infrastructure. Cisco has advised customers to upgrade to patched software to mitigate the risk. This vulnerability follows a history of similar issues in Cisco products, which have previously been exploited in attacks. The advisory was published on May 6, 2026. 3 sources 58

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New Cisco Network Vulnerability Let Remote Attacker Cause DoS Attack

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