{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/products/arista-extensible-operating-system/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":["cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*","cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*","cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*","cpe:2.3:a:cisco:catalyst_sd-wan_manager:20.12.7:*:*:*:*:*:*:*","cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*","cpe:2.3:a:cisco:sd-wan_vsmart_controller:20.12.7:*:*:*:*:*:*:*"],"_cs_cves":[{"cvss":5.8,"id":"CVE-2026-7473"},{"cvss":8.8,"id":"CVE-2026-11645"},{"cvss":7.8,"id":"CVE-2026-20245"}],"_cs_exploited":false,"_cs_has_poc":true,"_cs_poc_references":["https://sploitus.com/exploit?id=KITPLOIT:TOOLS-GITHUB-FEVAR54-CVE-2026-7473---ARISTA-EOS-TUNNEL-DECAPSULATION-BYPASS\u0026utm_source=rss\u0026utm_medium=rss"],"_cs_products":["Extensible Operating System","Arista Extensible Operating System","Google Chromium V8","Cisco Catalyst SD-WAN Manager","EOS"],"_cs_severities":["high"],"_cs_tags":["vulnerability","cve","network-device","infrastructure"],"_cs_type":"advisory","_cs_vendors":["Arista","Google","Cisco"],"content_html":"\u003cp\u003eArista Extensible Operating System (EOS) is affected by CVE-2026-7473, a critical incomplete comparison with missing factors vulnerability. This flaw enables a compromised or malicious actor to craft specific tunneled packets that, when directed to a vulnerable Arista EOS switch, are incorrectly decapsulated and subsequently forwarded to unintended network destinations. The vulnerability arises when the switch's configured decapsulation IP matches the destination IP of such a specially crafted, unexpected tunneled packet. This misrouting can lead to severe consequences, including network segmentation bypass, unauthorized access to internal resources, or denial of service by disrupting legitimate traffic flows. CISA has added this CVE to its Known Exploited Vulnerabilities Catalog, indicating a significant risk and recommending immediate mitigation.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003eAttacker Reconnaissance:\u003c/strong\u003e An attacker identifies a publicly exposed Arista EOS switch configured to decapsulate tunneled traffic.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eDecapsulation IP Identification:\u003c/strong\u003e The attacker determines the switch's specific IP address configured for tunneled packet decapsulation, either through reconnaissance or prior knowledge.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eMalformed Packet Crafting:\u003c/strong\u003e The attacker creates a malformed or \u0026quot;unexpected\u0026quot; tunneled packet, leveraging the \u0026quot;incomplete comparison\u0026quot; vulnerability in Arista EOS.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eTargeted Packet Destination:\u003c/strong\u003e The crafted tunneled packet's destination IP is set to match the identified decapsulation IP of the vulnerable Arista EOS switch.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003ePacket Transmission:\u003c/strong\u003e The attacker sends the specially crafted tunneled packet towards the vulnerable Arista EOS switch.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eIncorrect Decapsulation:\u003c/strong\u003e Due to CVE-2026-7473, the Arista EOS switch incorrectly decapsulates the unexpected tunneled packet, despite its malformed nature or unauthorized origin.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eUnauthorized Forwarding:\u003c/strong\u003e The switch then forwards the content of the improperly decapsulated packet according to its internal routing tables, directing it to an internal network segment or host it should not reach.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eImpact Execution:\u003c/strong\u003e The misforwarded traffic leads to unauthorized network access, data exfiltration, or a bypass of network security controls, achieving the attacker's objective.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-7473 can lead to significant network security breaches. The primary impact involves the bypassing of network segmentation and access controls, allowing an attacker to gain unauthorized access to internal, sensitive network segments, applications, or data that would typically be protected. This could facilitate data exfiltration, lateral movement, or the establishment of persistent access within the compromised network. Furthermore, incorrect packet forwarding can disrupt legitimate network operations, potentially leading to denial-of-service conditions or network instability. While specific victim counts are not publicly available, the inclusion in CISA's KEV catalog underscores its critical risk to organizations utilizing Arista EOS.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply mitigations outlined in the Arista security advisory (\u003ca href=\"https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137\"\u003ehttps://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137\u003c/a\u003e) immediately.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rules \u0026quot;Detects CVE-2026-7473 exploitation - Anomalous Internal Network Flow After Arista EOS\u0026quot; and \u0026quot;Detects CVE-2026-7473 exploitation - Suspicious Tunneled Traffic Targeting Arista Decapsulation IP (Non-Legitimate Source)\u0026quot; to your SIEM for detection of exploitation attempts and successful breaches.\u003c/li\u003e\n\u003cli\u003eEnsure comprehensive network logging is enabled on all Arista EOS devices and adjacent firewall/network monitoring solutions to capture detailed traffic flow and decapsulation events.\u003c/li\u003e\n\u003cli\u003eReview and enforce network segmentation policies to minimize the blast radius should a vulnerability like CVE-2026-7473 be exploited, as per BOD 22-01 guidance.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-09-18T10:27:52Z","date_published":"2026-06-14T08:53:40Z","id":"https://feed.craftedsignal.io/briefs/2026-06-arista-eos-cve-2026-7473/","summary":"Arista Extensible Operating System (EOS) contains CVE-2026-7473, an incomplete comparison vulnerability that allows a switch to incorrectly decapsulate and forward unexpected tunneled packets if their destination IP matches the switch's configured decapsulation IP, potentially leading to unauthorized network access or bypass of security controls.","title":"CVE-2026-7473: Arista EOS Incomplete Comparison Vulnerability Leading to Incorrect Packet Forwarding","url":"https://feed.craftedsignal.io/briefs/2026-06-arista-eos-cve-2026-7473/"}],"language":"en","title":"CraftedSignal Threat Feed - Arista Extensible Operating System","version":"https://jsonfeed.org/version/1.1"}