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CVE-2025-20352 is a stack-based buffer overflow in the Simple Network Management Protocol subsystem of Cisco IOS Software and Cisco IOS XE Software. An authenticated remote attacker can send a crafted SNMP packet over IPv4 or IPv6 to trigger the overflow. The issue affects all SNMP versions. Depending on the attacker’s privileges and affected platform, exploitation can reload the device or execute arbitrary code as root on Cisco IOS XE.
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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 valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
211 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Cisco IOS/IOS XE SNMP flaw that can enable remote code execution or denial of service and is reported as exploited in the wild.
A stack-based buffer overflow vulnerability in Cisco IOS/IOS XE SNMP functionality, confirmed to be actively exploited.
Remote code execution zero-day in Cisco IOS/IOS-XE described as exploited (per threat intelligence reporting).
A stack-based buffer overflow in Cisco IOS and IOS XE SNMP subsystem allowing DoS or remote code execution, actively exploited in the wild and affecting millions of devices, including industrial switches.
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.