Loading vulnerability…
CVE-2026-20271 is a high-severity vulnerability record affecting Cisco IOS XE Software. It covers multiple internally discovered software hardening issues related to insufficient control flow management, mapped to CWE-691. Reported issue classes associated with this record include race conditions, uncontrolled recursion, and infinite loops. The vulnerability is described as remotely exploitable and affects Cisco IOS XE Software running in autonomous mode or controller mode. Cisco assigned a CVSS v3.1 base score of 8.6 with vector AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H, indicating a network-reachable flaw with low attack complexity and no required privileges or user interaction, primarily resulting in availability impact.
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.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An insufficient control flow management vulnerability affecting Cisco IOS XE Software.
A Cisco IOS XE Software vulnerability involving insufficient control-flow management.
A Cisco IOS XE Software vulnerability involving insufficient control-flow management.
An insufficient control flow management vulnerability in Cisco IOS XE Software.
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.