Security readout for executives and security teams
Plain-English summary
CVE-2021-1562 affects Cisco BroadWorks Application Server. A logged-in remote user could abuse the XSI-Actions interface to join a Call Center instance and receive queued calls they should not access. This is a confidentiality issue, not a known system takeover or outage risk.
Executive priority
Treat as a moderate priority for telecom or contact-center environments. It could expose customer or business calls to unauthorized authenticated users, but the provided evidence does not show unauthenticated exploitation, active exploitation, or broad destructive impact.
Technical view
The flaw is improper input validation and authorization for specific XSI-Actions commands. Exploitation requires network access and valid authentication, with no user interaction. Cisco scored it CVSS 3.1 4.3, affecting confidentiality only. Affected version detail is not provided in the source bundle.
Likely exposure
Exposure is most relevant for organizations running Cisco BroadWorks Application Server with XSI-Actions enabled and Call Center functionality in use. Risk increases if many users have accounts or if the interface is broadly reachable.
Exploitation context
The source bundle does not report active exploitation, and KEV is false. Exploitation requires an authenticated remote attacker issuing specific commands. Successful abuse could route calls from a Call Center queue to an unauthorized user.
Researcher notes
Key unknowns are exact affected versions, fixed firmware identifiers, and any Cisco-listed workarounds beyond firmware patch availability. Validation should focus on authenticated access paths, authorization boundaries in XSI-Actions, and Call Center queue membership integrity without attempting exploit reproduction.
Mitigation direction
- Review Cisco advisory for applicable fixed firmware and deployment guidance.
- Apply available firmware patches after normal change control.
- Restrict XSI-Actions access to trusted users and networks where feasible.
- Review Call Center queue permissions and remove unnecessary user access.
Validation and detection
- Confirm whether Cisco BroadWorks Application Server is deployed.
- Check whether XSI-Actions and Call Center features are enabled.
- Inventory firmware status against Cisco advisory guidance.
- Audit Call Center memberships for unexpected or unauthorized users.
- Review logs for unusual queue joins or unexpected call distribution.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-1562 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210707 Cisco BroadWorks Application Server Information Disclosure VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.