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Known exploited vulnerability

CVE-2026-20320

highCVSS 3.1 7.5In CISA KEVEPSS 0.39%Published · Cisco

The short answer

CVE-2026-20320 affects Cisco Cisco BroadWorks and is rated high (CVSS 7.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-11-10: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-611.

Severity

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploited (CISA KEV)

Yes, since Nov 10, 2026

Federal due date Nov 24, 2026

EPSS, next 30 days

0.39%

Higher than 33% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

What CISA says to do

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for…

Affected products

Cisco BroadWorks. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-20320 being exploited?

Yes. CISA added CVE-2026-20320 to its Known Exploited Vulnerabilities catalog on 2026-11-10, with a federal remediation due date of 2026-11-24.

How do I fix CVE-2026-20320?

CISA's required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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