{"id":14638,"date":"2025-08-27T21:27:41","date_gmt":"2025-08-27T21:27:41","guid":{"rendered":"http:\/\/localhost\/?p=14638"},"modified":"2025-08-27T21:27:41","modified_gmt":"2025-08-27T21:27:41","slug":"cisco-nexus-3000-and-9000-series-switches-is-is-protocol-tbd-denial-of-service-vulnerability","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=14638","title":{"rendered":"Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol <TBD> Denial of Service Vulnerability_CVE-2025-20241"},"content":{"rendered":"<p>{&#8220;lastseen&#8221;:&#8221;&#8221;,&#8221;description&#8221;:&#8221;A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the IS-IS process to unexpectedly restart, which could cause an affected device to reload.\\r\\n\\r\\nThis vulnerability is due to insufficient input validation when parsing an ingress IS-IS packet. An attacker could exploit this vulnerability by sending a crafted IS-IS packet to an affected device. A successful exploit could allow the attacker to cause the unexpected restart of the IS-IS process, which could cause the affected device to reload, resulting in a denial of service (DoS) condition.\\r\\nNote: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device.&#8221;,&#8221;published&#8221;:&#8221;2025-08-27T16:23:55.242Z&#8221;,&#8221;modified&#8221;:&#8221;2025-08-27T18:18:32.250Z&#8221;,&#8221;type&#8221;:&#8221;cve&#8221;,&#8221;title&#8221;:&#8221;Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol \\u003cTBD\\u003e Denial of Service Vulnerability&#8221;,&#8221;source&#8221;:&#8221;cisco&#8221;,&#8221;references&#8221;:&#8221;https:\/\/sec.cloudapps.cisco.com\/security\/center\/content\/CiscoSecurityAdvisory\/cisco-sa-n39k-isis-dos-JhJA8Rfx&#8221;,&#8221;id&#8221;:&#8221;CVE-2025-20241&#8243;,&#8221;bulletinFamily&#8221;:&#8221;&#8221;,&#8221;cwe&#8221;:null,&#8221;cvelist&#8221;:null,&#8221;sourceData&#8221;:&#8221;Cisco Cisco NX-OS Software 9.2(3)\\nCisco Cisco NX-OS Software 7.0(3)I5(2)\\nCisco Cisco NX-OS Software 6.0(2)A8(7a)\\nCisco Cisco NX-OS Software 7.0(3)I4(5)\\nCisco Cisco NX-OS Software 7.0(3)I4(6)\\nCisco Cisco NX-OS Software 7.0(3)I4(3)\\nCisco Cisco NX-OS Software 9.2(2v)\\nCisco Cisco NX-OS Software 7.0(3)I4(7)\\nCisco Cisco NX-OS Software 7.0(3)I4(1)\\nCisco Cisco NX-OS Software 7.0(3)I4(8)\\nCisco Cisco NX-OS Software 7.0(3)I4(2)\\nCisco Cisco NX-OS Software 6.0(2)A8(11)\\nCisco Cisco NX-OS Software 9.2(1)\\nCisco Cisco NX-OS Software 9.2(2t)\\nCisco Cisco NX-OS Software 9.2(3y)\\nCisco Cisco NX-OS Software 7.0(3)I4(1t)\\nCisco Cisco NX-OS Software 7.0(3)I7(6z)\\nCisco Cisco NX-OS Software 9.3(2)\\nCisco Cisco NX-OS Software 7.0(3)F3(3)\\nCisco Cisco NX-OS Software 7.0(3)I7(3z)\\nCisco Cisco NX-OS Software 7.0(3)IM7(2)\\nCisco Cisco NX-OS Software 6.0(2)A8(11b)\\nCisco Cisco NX-OS Software 7.0(3)I7(5a)\\nCisco Cisco NX-OS Software 7.0(3)I6(1)\\nCisco Cisco NX-OS Software 7.0(3)I5(3b)\\nCisco Cisco NX-OS Software 9.2(4)\\nCisco Cisco NX-OS Software 6.0(2)A8(10)\\nCisco Cisco NX-OS Software 6.0(2)A8(2)\\nCisco Cisco NX-OS Software 7.0(3)IC4(4)\\nCisco Cisco NX-OS Software 7.0(3)F3(3c)\\nCisco Cisco NX-OS Software 7.0(3)F3(1)\\nCisco Cisco NX-OS Software 7.0(3)F3(5)\\nCisco Cisco NX-OS Software 7.0(3)I7(2)\\nCisco Cisco NX-OS Software 7.0(3)I5(3)\\nCisco Cisco NX-OS Software 7.0(3)I7(3)\\nCisco Cisco NX-OS Software 6.0(2)A8(6)\\nCisco Cisco NX-OS Software 7.0(3)I6(2)\\nCisco Cisco NX-OS Software 6.0(2)A8(5)\\nCisco Cisco NX-OS Software 9.3(1)\\nCisco Cisco NX-OS Software 6.0(2)A8(7)\\nCisco Cisco NX-OS Software 7.0(3)I7(6)\\nCisco Cisco NX-OS Software 6.0(2)A8(11a)\\nCisco Cisco NX-OS Software 7.0(3)I4(8z)\\nCisco Cisco NX-OS Software 7.0(3)I4(9)\\nCisco Cisco NX-OS Software 7.0(3)I7(4)\\nCisco Cisco NX-OS Software 7.0(3)I7(7)\\nCisco Cisco NX-OS Software 6.0(2)A8(9)\\nCisco Cisco NX-OS Software 6.0(2)A8(1)\\nCisco Cisco NX-OS Software 6.0(2)A8(10a)\\nCisco Cisco NX-OS Software 7.0(3)I5(1)\\nCisco Cisco NX-OS Software 9.3(1z)\\nCisco Cisco NX-OS Software 9.2(2)\\nCisco Cisco NX-OS Software 7.0(3)F3(4)\\nCisco Cisco NX-OS Software 7.0(3)I4(8b)\\nCisco Cisco NX-OS Software 6.0(2)A8(3)\\nCisco Cisco NX-OS Software 7.0(3)I4(6t)\\nCisco Cisco NX-OS Software 7.0(3)I5(3a)\\nCisco Cisco NX-OS Software 6.0(2)A8(8)\\nCisco Cisco NX-OS Software 7.0(3)I7(5)\\nCisco Cisco NX-OS Software 7.0(3)F3(3a)\\nCisco Cisco NX-OS Software 6.0(2)A8(4)\\nCisco Cisco NX-OS Software 7.0(3)I4(8a)\\nCisco Cisco NX-OS Software 7.0(3)F3(2)\\nCisco Cisco NX-OS Software 7.0(3)I4(4)\\nCisco Cisco NX-OS Software 7.0(3)I7(1)\\nCisco Cisco NX-OS Software 7.0(3)IA7(2)\\nCisco Cisco NX-OS Software 7.0(3)IA7(1)\\nCisco Cisco NX-OS Software 6.0(2)A8(7b)\\nCisco Cisco NX-OS Software 6.0(2)A8(4a)\\nCisco Cisco NX-OS Software 9.3(3)\\nCisco Cisco NX-OS Software 7.0(3)I7(8)\\nCisco Cisco NX-OS Software 9.3(4)\\nCisco Cisco NX-OS Software 9.3(5)\\nCisco Cisco NX-OS Software 7.0(3)I7(9)\\nCisco Cisco NX-OS Software 9.3(6)\\nCisco Cisco NX-OS Software 10.1(2)\\nCisco Cisco NX-OS Software 10.1(1)\\nCisco Cisco NX-OS Software 9.3(5w)\\nCisco Cisco NX-OS Software 9.3(7)\\nCisco Cisco NX-OS Software 9.3(7k)\\nCisco Cisco NX-OS Software 7.0(3)I7(9w)\\nCisco Cisco NX-OS Software 10.2(1)\\nCisco Cisco NX-OS Software 9.3(7a)\\nCisco Cisco NX-OS Software 9.3(8)\\nCisco Cisco NX-OS Software 7.0(3)I7(10)\\nCisco Cisco NX-OS Software 10.2(1q)\\nCisco Cisco NX-OS Software 10.2(2)\\nCisco Cisco NX-OS Software 9.3(9)\\nCisco Cisco NX-OS Software 10.1(2t)\\nCisco Cisco NX-OS Software 10.2(3)\\nCisco Cisco NX-OS Software 10.2(3t)\\nCisco Cisco NX-OS Software 9.3(10)\\nCisco Cisco NX-OS Software 10.2(2a)\\nCisco Cisco NX-OS Software 10.3(1)\\nCisco Cisco NX-OS Software 10.2(4)\\nCisco Cisco NX-OS Software 10.3(2)\\nCisco Cisco NX-OS Software 9.3(11)\\nCisco Cisco NX-OS Software 10.3(3)\\nCisco Cisco NX-OS Software 10.2(5)\\nCisco Cisco NX-OS Software 9.3(12)\\nCisco Cisco NX-OS Software 10.2(3v)\\nCisco Cisco NX-OS Software 10.4(1)\\nCisco Cisco NX-OS Software 10.3(99w)\\nCisco Cisco NX-OS Software 10.2(6)\\nCisco Cisco NX-OS Software 10.3(3w)\\nCisco Cisco NX-OS Software 10.3(99x)\\nCisco Cisco NX-OS Software 10.3(3o)\\nCisco Cisco NX-OS Software 10.3(4)\\nCisco Cisco NX-OS Software 10.3(3p)\\nCisco Cisco NX-OS Software 10.3(4a)\\nCisco Cisco NX-OS Software 10.4(2)\\nCisco Cisco NX-OS Software 10.3(3q)\\nCisco Cisco NX-OS Software 9.3(13)\\nCisco Cisco NX-OS Software 10.3(5)\\nCisco Cisco NX-OS Software 10.2(7)\\nCisco Cisco NX-OS Software 10.4(3)\\nCisco Cisco NX-OS Software 10.3(3x)\\nCisco Cisco NX-OS Software 10.3(4g)\\nCisco Cisco NX-OS Software 10.5(1)\\nCisco Cisco NX-OS Software 10.2(8)\\nCisco Cisco NX-OS Software 10.3(3r)\\nCisco Cisco NX-OS Software 10.3(6)\\nCisco Cisco NX-OS Software 9.3(14)\\nCisco Cisco NX-OS Software 10.4(4)\\nCisco Cisco NX-OS Software 10.3(4h)\\nCisco Cisco NX-OS Software 10.5(2)\\nCisco Cisco NX-OS Software 10.4(4g)&#8221;,&#8221;sourceHref&#8221;:&#8221;&#8221;,&#8221;cvss&#8221;:{&#8220;score&#8221;:7.4,&#8221;severity&#8221;:&#8221;HIGH&#8221;,&#8221;vector&#8221;:&#8221;CVSS:3.1\/AV:A\/AC:L\/PR:N\/UI:N\/S:C\/C:N\/I:N\/A:H&#8221;,&#8221;version&#8221;:&#8221;3.1&#8243;},&#8221;cvss2&#8243;:{},&#8221;cvss3&#8243;:{&#8220;version&#8221;:&#8221;&#8221;,&#8221;vectorString&#8221;:&#8221;&#8221;,&#8221;baseScore&#8221;:0,&#8221;baseSeverity&#8221;:&#8221;&#8221;,&#8221;attackVector&#8221;:&#8221;&#8221;,&#8221;attackComplexity&#8221;:&#8221;&#8221;,&#8221;privilegesRequired&#8221;:&#8221;&#8221;,&#8221;userInteraction&#8221;:&#8221;&#8221;,&#8221;scope&#8221;:&#8221;&#8221;,&#8221;confidentialityImpact&#8221;:&#8221;&#8221;,&#8221;integrityImpact&#8221;:&#8221;&#8221;,&#8221;availabilityImpact&#8221;:&#8221;&#8221;,&#8221;cvssV3&#8243;:{&#8220;version&#8221;:&#8221;&#8221;,&#8221;vectorString&#8221;:&#8221;&#8221;,&#8221;baseScore&#8221;:0,&#8221;baseSeverity&#8221;:&#8221;&#8221;,&#8221;attackVector&#8221;:&#8221;&#8221;,&#8221;attackComplexity&#8221;:&#8221;&#8221;,&#8221;privilegesRequired&#8221;:&#8221;&#8221;,&#8221;userInteraction&#8221;:&#8221;&#8221;,&#8221;scope&#8221;:&#8221;&#8221;,&#8221;confidentialityImpact&#8221;:&#8221;&#8221;,&#8221;integrityImpact&#8221;:&#8221;&#8221;,&#8221;availabilityImpact&#8221;:&#8221;&#8221;}},&#8221;href&#8221;:&#8221;&#8221;,&#8221;category_name&#8221;:&#8221;CVE&#8221;,&#8221;post_link&#8221;:&#8221;&#8221;,&#8221;product&#8221;:&#8221;Cisco NX-OS Software&#8221;,&#8221;version&#8221;:&#8221;9.2(3)&#8221;,&#8221;vendor&#8221;:&#8221;Cisco&#8221;,&#8221;ai_description&#8221;:&#8221;&#8221;,&#8221;ai_severity&#8221;:&#8221;&#8221;,&#8221;ai_vendor&#8221;:&#8221;&#8221;,&#8221;ai_product&#8221;:&#8221;&#8221;,&#8221;ai_version&#8221;:&#8221;&#8221;,&#8221;ai_score&#8221;:0}<\/p>\n","protected":false},"excerpt":{"rendered":"<p>{&#8220;lastseen&#8221;:&#8221;&#8221;,&#8221;description&#8221;:&#8221;A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[6,8,29,12,15,13,7,11,5],"class_list":["post-14638","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-cve","tag-cvss","tag-cvss-74","tag-exploit","tag-high","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol  Denial of Service Vulnerability_CVE-2025-20241 - zero redgem<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zero.redgem.net\/?p=14638\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta 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