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CVE-2025-20165 is a denial-of-service vulnerability in the SIP processing subsystem of Cisco BroadWorks. The flaw is caused by improper memory handling when the product processes certain SIP requests. By sending a high volume of crafted SIP requests to affected BroadWorks Network Servers that handle SIP traffic, a remote unauthenticated attacker can trigger memory exhaustion. Once available memory is depleted, the affected Network Servers are no longer able to continue processing incoming SIP requests, causing service disruption. Recovery requires manual intervention.
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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.
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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.