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CVE-2026-20270 is a high-severity vulnerability record affecting Cisco IOS XE Software. It covers multiple internally discovered incorrect calculation issues addressed through Cisco software hardening releases. Cisco classifies the weakness under CWE-682, indicating arithmetic or numeric conversion errors such as integer overflow, underflow, truncation, or related miscalculation conditions. The available information does not identify the specific vulnerable component, code path, or function, but indicates that the issue is remotely exploitable over the network and was found during an internal security review of IOS XE releases running in autonomous or controller mode.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity Cisco IOS XE vulnerability involving incorrect calculation errors such as integer overflow, underflow, truncation, or numeric conversion issues.
An incorrect calculation vulnerability affecting Cisco IOS XE Software.
A Cisco IOS XE Software vulnerability involving incorrect calculation and numeric conversion issues such as integer overflow and truncation.
A Cisco IOS XE Software vulnerability involving incorrect calculation and numeric conversion issues.
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.