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CVE-2025-20261 is a privilege escalation vulnerability in the SSH connection handling of Cisco Integrated Management Controller (IMC) affecting Cisco UCS B-Series, UCS C-Series, UCS S-Series, and UCS X-Series Servers. The flaw is caused by insufficient restrictions on access to internal services. An authenticated remote attacker with a valid user account can exploit the issue by using crafted syntax while establishing an SSH connection to the Cisco IMC of an affected device. Successful exploitation can grant access to internal services with elevated privileges, enabling unauthorized changes to the managed 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.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A privilege escalation vulnerability in Cisco IMC SSH connection handling.
A high-severity Cisco Integrated Management Controller (IMC) vulnerability caused by insufficient restrictions on access to internal services, allowing a logged-in attacker to gain elevated privileges and make unauthorized modifications, including creating new administrative accounts.
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.