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CVE Record

CVE-2021-1500: Cisco Webex Video Mesh Arbitrary Site Redirection Vulnerability

A vulnerability in the web-based management interface of Cisco Webex Video Mesh could allow an unauthenticated, remote attacker to redirect a user to a malicious web page. This vulnerability is due to improper input validation of the URL parameters in an HTTP request. An attacker could exploit this vulnerability by persuading a user to click a crafted link. A successful exploit could allow the attacker to redirect a user to a malicious website. Attackers may use this type of vulnerability, known as an open redirect attack, as part of a phishing attack to persuade users to unknowingly visit malicious sites.

MediumCVSS 5.4Not KEV-listedUpdated
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-1500 is an open redirect in Cisco Webex Video Mesh’s web management interface. If a user clicks a crafted link, they can be sent to a malicious site that appears connected to trusted Webex infrastructure. The main business risk is phishing support, not direct system takeover.

Executive priority

Treat as a moderate-priority phishing enabler. It should be tracked and remediated during normal vulnerability cycles, with faster action if Webex Video Mesh is internet-reachable or heavily used by privileged administrators.

Technical view

The issue is CWE-601 caused by improper URL parameter validation in HTTP requests to the web-based management interface. It is remotely reachable without authentication but requires user interaction. CVSS 3.1 is 5.4, with limited confidentiality and integrity impact and no availability impact.

Likely exposure

Organizations operating Cisco Webex Video Mesh are potentially exposed. The provided record does not name affected or fixed versions, so exposure must be validated against Cisco’s advisory and deployed Video Mesh inventory.

Exploitation context

The source bundle reports no CISA KEV listing and provides no evidence of active exploitation. Exploitation requires persuading a user to open a crafted link, making it most relevant as part of phishing or social engineering activity.

Researcher notes

Evidence is limited to the CVE record and Cisco advisory reference. Affected versions are not specified in the provided bundle. Do not assume exploit activity, patch levels, or appliance scope beyond Cisco Webex Video Mesh.

Mitigation direction

  • Check Cisco’s advisory for fixed software or official mitigation guidance.
  • Inventory Cisco Webex Video Mesh deployments and management interfaces.
  • Apply Cisco-recommended updates when the applicable version is confirmed.
  • Limit management interface exposure where operationally feasible.
  • Reinforce phishing defenses for links referencing Webex infrastructure.

Validation and detection

  • Confirm whether Cisco Webex Video Mesh is deployed in the environment.
  • Compare deployed versions against Cisco’s advisory guidance.
  • Review web management access paths and user groups with access.
  • Check security monitoring for suspicious Webex-themed redirection or phishing reports.
  • Document whether compensating controls reduce user exposure.
Prepared
Confidence
high
Sources
3

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · medium confidence lookup

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 lookup
cve · low confidence lookup

CVE-2021-1500 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.4 (3.1)
Known Exploited
No
Published

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

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
5.4CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N2.82.5Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.4Medium
CVSS 3.1 vector shape for CVE-2021-1500Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco Webex Video Meshn/aListed
Weakness

CWE details

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-601 · source CWE mapping

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.