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CVE-2026-20263 is a high-severity denial-of-service vulnerability in the Blocks Extensible Exchange Protocol (BEEP) feature of Cisco IOS XE Software. The flaw is caused by improper handling during parsing of a specific BEEP SOAP request. A remote, unauthenticated attacker can trigger the vulnerability by sending a crafted BEEP SOAP request to an affected device. Successful exploitation causes the device to reload unexpectedly, interrupting normal operation and producing a denial-of-service condition. The issue is remotely reachable over the network, requires no privileges, and does not require user interaction.
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What an attacker gets, and what they’ve been doing with it.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A 7PK - Errors vulnerability in Cisco IOS XE Software.
A high-severity denial-of-service vulnerability in the BEEP feature of Cisco IOS XE Software caused by improper parsing of a specific BEEP SOAP request, allowing an unauthenticated remote attacker to trigger an unexpected device reload.
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.