Quick answers
- Is CVE-2026-20263 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-20263 being exploited in the wild.
- How severe is CVE-2026-20263?
- High severity, with a CVSS score of 8.6, published 5 August 2026.
- Which products and versions are affected?
- Cisco IOS XE Software Multiple releases with BEEP feature enabled (see Cisco Software Checker).
- Is there a fix for CVE-2026-20263?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-20263 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2026-20263?
- Check whether you run Cisco IOS XE Software at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This vulnerability exists in the Blocks Extensible Exchange Protocol (BEEP) feature of Cisco IOS XE Software and stems from improper handling of SOAP request parsing (CWE-388). An unauthenticated, network-accessible attacker can send a specially crafted BEEP SOAP request to an affected device. The vulnerability requires BEEP to be configured (either NETCONF over BEEP or a BEEP listener via the bingd process), but does not require authentication or user interaction. Successful exploitation causes the device to reload unexpectedly, resulting in a denial of service condition. Cisco has released software updates to address this vulnerability; no workarounds are available.
Affected products
- Cisco IOS XE Software Multiple releases with BEEP feature enabled (see Cisco Software Checker)
Timeline
- 2026-08-05: disclosed