Security readout for executives and security teams
Plain-English summary
CVE-2021-1599 is a cross-site scripting issue in Cisco Unified Customer Voice Portal's web management interface. An authenticated remote attacker would need to convince a user to open a malicious link. Successful exploitation could expose browser-based sensitive information, run code in the interface context, or under some conditions cause a device reboot.
Executive priority
Treat this as a moderate-priority administrative-interface risk. It is not cited as actively exploited in the provided sources, but it affects a voice platform management surface and can expose browser data or affect availability if a targeted user clicks a malicious link.
Technical view
Cisco describes insufficient input validation of a management-interface parameter in Cisco Unified CVP. The issue is CWE-79 with CVSS 3.1 score 5.4: network-reachable, low complexity, low privileges required, user interaction required, changed scope, low confidentiality impact, no integrity impact, and low availability impact.
Likely exposure
Exposure is limited to organizations running Cisco Unified Customer Voice Portal with reachable web-based management interfaces and authenticated users who can be targeted with links. The source bundle does not provide specific affected versions or CPEs.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Exploitation requires an authenticated remote attacker and a victim user clicking a malicious link, which lowers urgency compared with unauthenticated remote compromise but still matters for administrative interfaces.
Researcher notes
Key gaps are affected version detail and explicit remediation text in the supplied bundle. Use Cisco's advisory as the authoritative source for product/version mapping and fixes. Avoid assuming broader Cisco products are affected without direct vendor confirmation.
Mitigation direction
- Review Cisco's advisory for affected releases, fixed software, and any workarounds.
- Apply Cisco-recommended updates or mitigations where they apply.
- Restrict CVP management interface access to trusted administrative networks.
- Enforce least privilege for users with CVP management access.
- Warn CVP operators against unsolicited management-interface links.
Validation and detection
- Inventory Cisco Unified CVP deployments and management interface exposure.
- Compare installed CVP versions against Cisco's advisory and CVE record.
- Confirm management access is limited to authorized networks and users.
- Review administrative access logs for unusual management-interface activity.
- Track remediation status until Cisco guidance is applied or formally accepted.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-1599 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
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:L
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:R/S:C/C:L/I:N/A:L2.32.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:L
Source materials
- CVE List V5 sourceCVE List V5
- 20210721 Cisco Unified Customer Voice Portal Cross-Site Scripting 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.