{"id":1427,"date":"2026-06-24T08:40:00","date_gmt":"2026-06-24T08:40:00","guid":{"rendered":"https:\/\/thedigitalfortress.us\/?p=1427"},"modified":"2026-06-24T08:40:00","modified_gmt":"2026-06-24T08:40:00","slug":"cisco-unified-cm-flaw-exploited-after-poc-reveals-file-write-path-to-root","status":"publish","type":"post","link":"https:\/\/thedigitalfortress.us\/?p=1427","title":{"rendered":"Cisco Unified CM Flaw Exploited After PoC Reveals File-Write Path to Root"},"content":{"rendered":"
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\ue804<\/i>Ravie Lakshmanan<\/span>\ue802<\/i>Jun 24, 2026<\/span><\/span>Vulnerability \/ Network Security<\/span><\/p>\n<\/div>\n

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Threat actors have begun to exploit a recently disclosed critical security flaw impacting Cisco Unified Communications Manager (Unified CM) and Unified Communications Manager Session Management Edition (Unified CM SME).<\/p>\n

The vulnerability, tracked as CVE-2026-20230<\/b> (CVSS score: 8.6), is a case of improper input validation for specific HTTP requests that could allow an unauthenticated, remote attacker to conduct server-side request forgery (SSRF) attacks through an affected device.<\/p>\n

\u00abAn attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device,\u00bb Cisco said in an advisory released earlier this month. \u00abA successful exploit could allow the attacker to write files to the underlying operating system that could be used later to elevate to root.\u00bb<\/p>\n

In a post shared on X earlier this week, Defused Cyber said<\/a> it observed active exploitation of the vulnerability in attacks. \u00abThis is currently being exploited from a single source using an unvetted PoC, with genuinely-formatted file:\/\/ file-write payloads landing on our decoys,\u00bb it noted.<\/p>\n

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\"Cybersecurity\"<\/a><\/div>\n<\/div>\n

However, for successful exploitation to occur, the WebDialer service must be enabled. It’s disabled by default. To check if the WebDialer is enabled, users can complete<\/a> the following steps –<\/p>\n