Cisco BroadWorks Out-of-Band Blind XML External Entity Injection Vulnerability

highCVE-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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bworks-xxe-uwUd7CEt Security Impact Rating: High CVE: CVE-2026-20320

CSIRTS triage

vendor: Cisco product: BroadWorks Information disclosure

What: Out-of-band blind XML external entity injection in the OCI XML Parser allows unauthenticated remote attackers to read sensitive configuration files.
Who is affected: Cisco BroadWorks deployments with OCI-P service enabled are affected.
Urgency: High urgency; remote unauthenticated exploitation allows exposure of sensitive filesystem information.
Action: Apply Cisco BroadWorks software updates addressing CVE-2026-20320.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Cisco Security Advisories (INTL · vendor-psirt · site)
Severity: high
Published: 2026-08-19
Exploitation: Not in CISA KEV at last sync

Original advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bworks-xxe-uwUd7CEt?vs_f=Cisco%20Security%20Advisory%26vs_cat=Security%20Intelligence%26vs_type=RSS%26vs_p=Cisco%20BroadWorks%20Out-of-Band%20Blind%20XML%20External%20Entity%20Injection%20Vulnerability%26vs_k=1

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-203200.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-20320	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownMultiple vulnerabilities in Cisco products (20 August 2026)cert-fr-avis
highCVE-2026-20320: A vulnerability in the Open Client Interface (OCI) XML Parser of Cisco BroadWorks could allow …nvd
criticalCisco Advance Notification for Publication of August 19, 2026, Security Advisoriescisco-psirt