Affects Cisco IOS XR, a widely used network OS for service providers and enterprises; exploitation could disrupt critical network infrastructure.
CVE-2026-20280
Cisco IOS XR exception-handling flaws enable DoS or possible code execution
Is CVE-2026-20280 being exploited?
Not confirmed. CVE-2026-20280 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-20280?
CVE-2026-20280 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-20280?
Yes. A fix has been recorded for CVE-2026-20280. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-20280 affect?
CVE-2026-20280 affects Cisco IOS XR Software, Service provider and enterprise routers running IOS XR. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-20280?
Apply Cisco IOS XR hardening updates immediately; restrict management-plane access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Crafted inputs can trigger improper exception handling causing device crashes (DoS), control-plane disruption, or potential remote code execution.
Immediate action required
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As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.