# CVE-2026-20320 — Cisco BroadWorks

> As of 2026-11-09, CVE-2026-20320 is a HIGH-severity vulnerability in Cisco BroadWorks, CVSS v3.1 7.5, EPSS 0.4% (42.7th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-20320, most recently “Operation Snowball: Autonomous AI-Driven Intrusion Campaign Exploiting Cisco BroadWorks XSP (CVE-2026-20320) Against European Telecom”.

**Last updated:** 2026-11-09

## What is CVE-2026-20320?

A vulnerability in the Open Client Interface (OCI) XML Parser of Cisco BroadWorks could allow an unauthenticated, remote attacker to read sensitive configuration information on an affected system. This vulnerability exists because XML entries are improperly parsed due to external entity resolution being allowed by default. An attacker could exploit this vulnerability by sending a crafted XML message to the Open Client Interface – Provisioning (OCI-P) service. A successful exploit could allow the attacker to view sensitive files from the filesystem with the privileges of the Cisco BroadWorks user.

The record classifies CVE-2026-20320 under weakness class [CWE-611](https://cwe.mitre.org/data/definitions/611.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 82 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.5 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 42.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-19

## Is CVE-2026-20320 being exploited?

It currently carries a trending score of 25 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Cisco](https://intel.threadlinqs.com/vendors/cisco): BroadWorks

## How to fix CVE-2026-20320

No vendor patch reference has been recorded for CVE-2026-20320 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-20320

1 tracked threat in the Threadlinqs corpus references CVE-2026-20320, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Operation Snowball: Autonomous AI-Driven Intrusion Campaign Exploiting Cisco BroadWorks XSP (CVE-2026-20320) Against European Telecom](https://intel.threadlinqs.com/threat/TL-2026-5542) — HIGH · 2026-11-09

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [sec.cloudapps.cisco.com](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bworks-xxe-uwUd7CEt)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-20320
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