Affects Cisco IOS XE network OS; unauthenticated remote DoS that can reload routers/switches and disrupt enterprise networks.
CVE-2026-20263
Unauthenticated BEEP SOAP parsing flaw in Cisco IOS XE enables remote DoS (device reload).
Is CVE-2026-20263 being exploited?
Not confirmed. CVE-2026-20263 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 0.33% probability of exploitation in the next 30 days.
How severe is CVE-2026-20263?
CVE-2026-20263 is rated High with a CVSS score of 8.6. 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-2026-20263?
Not known from our data. No patch reference has been recorded for CVE-2026-20263, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-20263 affect?
CVE-2026-20263 affects Cisco IOS XE (BEEP feature enabled), Routers and switches running IOS XE. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-20263?
Apply vendor patch/mitigations; block or restrict BEEP traffic; harden management plane.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote unauthenticated attacker can send crafted BEEP SOAP requests to trigger device reloads, causing network device DoS and service disruption.
Patch when possible
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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.