Security readout for executives and security teams
Plain-English summary
Cisco Virtualized Voice Browser has a web management interface flaw that can let an unauthenticated remote attacker run script in a victim user's browser after persuading them to click a crafted link. Business impact is mainly credential, session, or browser-data exposure tied to administrators using that interface.
Executive priority
Handle through the normal vulnerability management queue with moderate priority. Escalate if the management interface is broadly reachable, used by privileged administrators, or exposed to untrusted networks. No source-provided evidence supports emergency treatment for active exploitation.
Technical view
CVE-2021-1575 is a reflected cross-site scripting issue in Cisco Virtualized Voice Browser caused by insufficient validation of user-supplied input in the web-based management interface. CVSS 3.1 is 6.1, with network attack vector, low complexity, no privileges required, user interaction required, changed scope, and low confidentiality and integrity impact.
Likely exposure
Exposure is limited to organizations running Cisco Virtualized Voice Browser with users who access its web-based management interface. The source bundle does not identify affected versions, CPEs, or deployment prevalence, so asset inventory and Cisco advisory review are necessary.
Exploitation context
The provided sources describe exploitation as requiring a victim to click a crafted link. KEV status is false, and the bundle provides no cited evidence of active exploitation or public weaponization. Treat this as a targeted phishing-assisted management-interface risk, not confirmed widespread exploitation.
Researcher notes
The record identifies CWE-79 and an unauthenticated, remote XSS path requiring user interaction. Affected version detail is absent in the bundle, and remediation specifics are not included. Validation should focus on product presence, interface reachability, administrator exposure, and Cisco advisory mapping.
Mitigation direction
- Inventory Cisco Virtualized Voice Browser deployments and responsible owners.
- Review Cisco's advisory for affected releases and vendor-supported fixes.
- Apply supported updates after confirming applicability with Cisco guidance.
- Limit management-interface use to trusted administrators and trusted network paths.
- Warn administrators against unexpected links targeting management interfaces.
Validation and detection
- Confirm whether Cisco Virtualized Voice Browser is deployed in the environment.
- Identify which deployed versions map to Cisco's advisory guidance.
- Verify who can reach the web-based management interface.
- Check whether administrators have reported suspicious management-interface links.
- Document patch status and any compensating access restrictions.
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 lookupCVE-2021-1575 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210707 Cisco Virtualized Voice Browser 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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.