Security readout for executives and security teams
Plain-English summary
CVE-2021-1358 is an open redirect in Cisco Finesse. A remote unauthenticated attacker could trick a user into clicking a link that appears to involve the trusted Finesse interface but sends them to an unwanted site, supporting phishing or user deception.
Executive priority
Prioritize remediation in contact-center environments where users regularly trust Finesse links. The technical severity is medium, but business impact can rise if phishing succeeds against agents or administrators.
Technical view
The Finesse web management interface improperly validates URL parameters in HTTP requests. Exploitation requires user interaction and can redirect the browser to an attacker-selected URL. CVSS 3.1 is 4.7, with network access, low complexity, no privileges, changed scope, and low integrity impact.
Likely exposure
Exposure is most likely in organizations using Cisco Finesse with Cisco Unified Contact Center Express. The provided bundle does not identify affected versions, so teams must compare deployed Finesse/UCCX versions against Cisco guidance.
Exploitation context
The sources describe phishing-oriented abuse through crafted links, but the bundle does not cite active exploitation, public exploit availability, or CISA KEV listing. Treat it as credible social-engineering risk, not confirmed in-the-wild exploitation.
Researcher notes
Evidence is limited to the CVE record and Cisco advisory reference in the bundle. Do not assume specific affected versions, fixed releases, or exploit maturity without consulting the Cisco advisory directly.
Mitigation direction
- Review Cisco's advisory for affected releases and vendor-provided remediation.
- Apply Cisco-recommended updates or configuration guidance for deployed Finesse/UCCX systems.
- Limit Finesse interface access to trusted networks where operationally possible.
- Educate Finesse users to distrust unexpected links involving the service.
- Monitor email reports and web logs for suspicious Finesse redirect patterns.
Validation and detection
- Inventory Cisco Finesse and Unified Contact Center Express deployments.
- Compare installed versions with Cisco's advisory and vendor support matrix.
- Confirm whether Finesse interfaces are reachable from untrusted networks.
- Review logs for unusual redirect-like requests involving Finesse URL parameters.
- Check phishing reports for links abusing trusted Finesse hostnames.
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-601: 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-2021-1358 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
- 4.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/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:N/I:L/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.7MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210519 Cisco Finesse Open Redirect 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.
URL Redirection to Untrusted Site ('Open Redirect')
URL Redirection to Untrusted Site ('Open Redirect') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.