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CVE-2025-20309 is a critical authentication vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME). The flaw is caused by a root account with static, hard-coded credentials that were reserved for development use but remained present in affected production releases. These credentials cannot be changed or deleted by administrators. An unauthenticated remote attacker can use the embedded root credentials to authenticate to an affected system and obtain root-level access. Cisco states that successful exploitation allows arbitrary command execution as root on the underlying operating system.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
52 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A previously patched Cisco Unified CM vulnerability that enabled threat actors to gain root privileges; mentioned only as background.
A Cisco Unified CM vulnerability involving a hard-coded root SSH account left in from development.
A maximum-severity Cisco Unified CM / Unified CM SME issue that allows root login via static credentials, leading to elevated privileges.
Critical vulnerability in Cisco Unified Communications Manager (Unified CM) and Unified CM Session Management Edition (Unified CM SME) that allows an unauthenticated remote attacker to log in as root using static credentials left in production systems.
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.