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CVE-2026-20276 tracks multiple internally discovered insufficient control-flow-management vulnerabilities in Cisco IOS XR Software. The issues are classified as CWE-691 and were identified during an internal security review. Cisco addressed them through IOS XR software-hardening releases. The assigned CVSS v3.1 vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
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Patch, then assume compromise.
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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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Cisco IOS XR Software vulnerability referenced by the September 2026 Cisco security-hardening release; the content provides no vulnerability-specific technical details.
A Cisco IOS XR Software vulnerability concerning insufficient control-flow management (CWE-691), identified through Cisco's internal security review and addressed in software-hardening releases.
A Cisco IOS XR Software hardening-release issue covering internally discovered insufficient control-flow-management vulnerabilities (CWE-691). It is network reachable, requires no privileges or user interaction, and can cause high availability impact; the supplied CVSS vector indicates scope changed and no stated confidentiality or integrity impact.
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.
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.