Loading vulnerability…
CVE-2025-20316 is an access control bypass vulnerability in Cisco IOS XE Software affecting Cisco Catalyst 9500X and 9600X Series Switches. The flaw is in ACL programming for traffic traversing a switch virtual interface with an egress ACL applied. When traffic is flooded from an unlearned MAC address, the device can forward that traffic in a way that bypasses the configured egress ACL. This condition can be triggered if an attacker causes the VLAN to flush its MAC address table, and it may also arise when the MAC address table is full. A remote, unauthenticated attacker could exploit this behavior to circumvent intended packet-filtering policy on an affected device.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An access control bypass vulnerability in certain Cisco IOS XE devices.
An access control bypass vulnerability affecting certain Cisco IOS XE devices.
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.