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CVE-2026-20275 tracks multiple internally discovered incorrect-calculation vulnerabilities in Cisco IOS XR Software. The flaws are classified as CWE-682 and were addressed through Cisco IOS XR software-hardening releases. The affected functions and precise faulty calculations have not been publicly specified.
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Incorrect-calculation vulnerabilities in Cisco IOS XR Software that permit an unauthenticated remote attacker to execute arbitrary code or cause denial of service.
A Cisco IOS XR Software vulnerability involving incorrect calculation issues (CWE-682), addressed through Cisco software-hardening releases following an internal security review.
A Cisco IOS XR Software vulnerability record covering multiple internally discovered incorrect-calculation issues (CWE-682). It has a CVSS v3.1 vector of AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating adjacent-network exploitation with low complexity, no privileges or user interaction, and potential complete impact to confidentiality, integrity, and availability.
A Cisco IOS XR vulnerability; no further technical details are provided.
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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.