CVE-2026-20320
High7.5CISA KEV — exploited in the wildCisco BroadWorks Improper Restriction of XML External Entity Reference Vulnerabilityname from CISA KEV
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.
- CVSS
- 7.5v3.1
- EPSS (exploit probability)
- 0.4%33th pct
- CISA KEV
- Listed
EPSS trendFIRST daily scores, last 90 days
Daily values
| Score date | EPSS | Percentile |
|---|---|---|
| 2026-11-10 | 0.4% | 32.9% |
| 2026-11-09 | 0.4% | 32.9% |
| 2026-11-08 | 0.5% | 42.8% |
| 2026-11-07 | 0.5% | 42.7% |
| 2026-11-06 | 0.5% | 42.7% |
| 2026-11-05 | 0.5% | 42.7% |
| 2026-11-04 | 0.5% | 42.6% |
| 2026-11-03 | 0.5% | 42.5% |
| 2026-11-02 | 0.5% | 42.5% |
| 2026-11-01 | 0.5% | 42.5% |
| 2026-10-31 | 0.5% | 42.5% |
| 2026-10-30 | 0.5% | 42.5% |
| 2026-10-29 | 0.5% | 42.4% |
| 2026-10-28 | 0.5% | 42.4% |
| 2026-10-27 | 0.5% | 42.3% |
| 2026-10-26 | 0.5% | 42.2% |
| 2026-10-25 | 0.5% | 42.2% |
| 2026-10-24 | 0.5% | 41.6% |
| 2026-10-23 | 0.5% | 41.6% |
| 2026-10-22 | 0.5% | 41.6% |
| 2026-10-21 | 0.5% | 41.5% |
| 2026-10-20 | 0.5% | 41.3% |
| 2026-10-19 | 0.5% | 41.2% |
| 2026-10-18 | 0.5% | 41.1% |
| 2026-10-17 | 0.5% | 41.1% |
| 2026-10-16 | 0.5% | 41.1% |
| 2026-10-15 | 0.5% | 41.1% |
| 2026-10-14 | 0.5% | 41.0% |
| 2026-10-13 | 0.5% | 40.8% |
| 2026-10-12 | 0.5% | 40.7% |
| 2026-10-11 | 0.5% | 40.7% |
CISA KEV entrycatalogue 2026.11.10
- Date added
- 2026-11-10
- Federal due date
- 2026-11-24
- Known ransomware use
- Unknown
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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Verbatim from the CISA KEV catalogue (CISA KEV, fetched 2026-11-11 16:43 UTC). The due date applies to US federal agencies under BOD 22-01.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Learn
Why it happened and what stops it
The weakness (CWE)
How attackers use it (ATT&CK)
Typical for this kind of weakness across CISA KEV exploits (CTID), not specific to this CVE.
How it's exploited
What the attacker gets
Controls that mitigate it (NIST SP 800-53)
- SI-3Malicious Code ProtectionSystem and Information Integrity · mitigates 5 of these techniques
- SI-4System MonitoringSystem and Information Integrity · mitigates 5 of these techniques
- AC-2Account ManagementAccess Control · mitigates 4 of these techniques
- AC-3Access EnforcementAccess Control · mitigates 4 of these techniques
- AC-6Least PrivilegeAccess Control · mitigates 4 of these techniques
- CA-7Continuous MonitoringSecurity Assessment and Authorization · mitigates 4 of these techniques