Vulnerability report

Trusted Third Party Report Confirmed Confidence In CISA KEV

CVE-2026-20320

Cisco BroadWorks

Cisco BroadWorks

Watch CVE-2026-20320 Browse KEV feed
Severity
CVSS 7.5 · High
Confidence
Confirmed
Exploit status
Trusted Third Party Report
EPSS
0.8%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-20320 is an unauthenticated vulnerability affecting Cisco BroadWorks.

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Listed in CISA KEV. Also reported by third-party sources. Confidence is confirmed.

Who is affected?

Cisco BroadWorks.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Cisco BroadWorks

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.

Published
19 Aug 2026
Exploitation Attempts Reported
10 Nov 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

edge cisa

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-20320
  • cisco-sa-bworks-xxe-uwUd7CEt sec.cloudapps.cisco.com · CVE Record https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurity...

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation Attempts Observed in the Wild

CISA

Recorded 10 Nov 2026

A trusted third party reported exploitation attempts.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CISA First 2026-11-10 19:20 UTC
The Hacker News 2026-11-11 06:21 UTC
Cisco PSIRT CSAF 2026-11-12 18:32 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.5 High

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

0.8%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Restriction of XML External Entity Reference CWE-611

Recent mention · The Hacker News

Cisco BroadWorks and Openwave Flaws Actively Exploited Despite Available Patches

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) Tuesday added two security flaws impacting Cisco BroadWorks and Openwave Messaging Webtop Media Transcoder to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. Details of...

Read full advisory

All Mentions

Recent mention · The Hacker News

Cisco BroadWorks and Openwave Flaws Actively Exploited Despite Available Patches

The Hacker News · 11 Nov 2026

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) Tuesday added two security flaws impacting Cisco BroadWorks and Openwave Messaging Webtop Media Transcoder to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. Details of the vulnerabilities are below - CVE-2026-20320 (CVSS score: 7.5) - An improper restriction of XML external entity

Recent mention · Cisco Security Advisory

Cisco Advance Notification for Publication of August 19, 2026, Security Advisories

Cisco Security Advisory · 19 Aug 2026

On August 19, 2026, the Cisco Product Security Incident Response Team (PSIRT) published the following advisories: Cisco Security Advisory CVE ID Security Impact Rating CVSS Base Score Cisco Crosswork Security Hardening Release: August 2026 CVE-2026-20030CVE-2026-20357CVE-2026-20358CVE-2026-20359 Critical 10.0 Cisco Secure Workload Software Security Hardening Release: August 2026 CVE-2026-20231CVE-2026-20315CVE-2026-20317CVE-2026-20318CVE-2026-20319 Critical 10.0 Cisco BroadWorks Out-of-Band Blind XML External Entity Injection Vulnerability CVE-2026-20320 High 7.5 Cisco...

Recent mention · Cisco Security Advisory

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

Cisco Security Advisory · 19 Aug 2026

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...

Timeline

From disclosure to observed exploitation attempts

  1. 18:32 UTC

    KEV confirmed by Cisco PSIRT CSAF

    Exploitation attempts reported by an external source

  2. 06:21 UTC

    KEV confirmed by The Hacker News

    Exploitation attempts reported by an external source

  3. 19:20 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  4. 18:20 UTC

    Added to the Previdian watchlist

    Pro and Enterprise Watch users had 2 months of early warning before CISA KEV. Also 2 months before Previdian KEV.

  5. 16:39 UTC

    CVE published

    Vulnerability disclosed publicly

  6. 11:59 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-20320

Sample API response 
{
  "cve_id": "CVE-2026-20320",
  "confidence": "Confirmed",
  "cvss_score": 7.5,
  "cvss_estimated": false,
  "epss_score": 0.0082,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}