CVE-2026-20320
Cisco BroadWorks Improper Restriction of XML External Entity Reference Vulnerability
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Cisco BroadWorks Cisco |
Version not specified (affected) | CNA: cisco |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
NVD applicability configurations (1)
These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.
[
{
"negate": false,
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:cisco:broadworks_application_delivery_platform:*:*:*:*:*:*:*:*",
"versionEndExcluding": "ri.2026.07",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:cisco:broadworks_application_server:*:*:*:*:release_independent:*:*:*",
"versionEndExcluding": "2026.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:cisco:broadworks_profile_server:*:*:*:*:release_independent:*:*:*",
"versionEndExcluding": "2026.07",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:cisco:broadworks_xtended_services_platform:*:*:*:*:release_independent:*:*:*",
"versionEndExcluding": "2026.07",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
]CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | CNA: cisco |
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | NVD: [email protected] |
Exploit evidence
- https://malbearlabs.com/posts/operation-snowball-inside-an-autonomous-ai-intrusion-campaign
exploit · 134c704f-9b21-4f2e-91b3-4a467353bcc0
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bworks-xxe-uwUd7CEtCNA: cisco
- https://malbearlabs.com/posts/operation-snowball-inside-an-autonomous-ai-intrusion-campaignADP: CISA-ADP · third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20320ADP: CISA-ADP · government-resource
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bworks-xxe-uwUd7CEt[email protected] · Vendor Advisory
- https://malbearlabs.com/posts/operation-snowball-inside-an-autonomous-ai-intrusion-campaign134c704f-9b21-4f2e-91b3-4a467353bcc0 · Exploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20320134c704f-9b21-4f2e-91b3-4a467353bcc0 · US Government Resource
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