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CVE Record

CVE-2021-1372: Cisco Webex Meetings Desktop App and Webex Productivity Tools for Windows Shared Memory Information Disclosure Vulnerability

A vulnerability in Cisco Webex Meetings Desktop App and Webex Productivity Tools for Windows could allow an authenticated, local attacker to gain access to sensitive information on an affected system. This vulnerability is due to the unsafe usage of shared memory by the affected software. An attacker with permissions to view system memory could exploit this vulnerability by running an application on the local system that is designed to read shared memory. A successful exploit could allow the attacker to retrieve sensitive information from the shared memory, including usernames, meeting information, or authentication tokens. Note: To exploit this vulnerability, an attacker must have valid credentials on a Microsoft Windows end-user system and must log in after another user has already authenticated with Webex on the same end-user system.

MediumCVSS 5.5Not KEV-listedUpdated
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a local information disclosure issue in Cisco Webex software for Windows. A person who already has valid access to the Windows machine could read Webex shared memory and obtain sensitive data such as usernames, meeting details, or authentication tokens.

Executive priority

Treat as a moderate endpoint confidentiality risk. Prioritize shared workstations and environments where exposed Webex tokens or meeting details could support follow-on account or meeting access.

Technical view

Cisco describes unsafe shared-memory handling in Webex Meetings Desktop App and Webex Productivity Tools for Windows. The CVSS 3.1 vector is local, low complexity, low privileges, no user interaction, confidentiality high, with no integrity or availability impact.

Likely exposure

Exposure is most relevant on Windows endpoints running affected Webex desktop software, especially shared systems where one user authenticates to Webex and another valid local user logs in afterward.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation. Exploitation requires valid local Windows credentials and access after another user has authenticated with Webex on the same endpoint.

Researcher notes

The key condition is cross-user local exposure through shared memory. Evidence supports confidentiality impact only. The bundle does not provide affected version ranges, exploit availability, or named fixes beyond the Cisco advisory reference.

Mitigation direction

  • Review Cisco advisory for fixed releases, workarounds, and product-specific guidance.
  • Inventory Windows endpoints running Webex Meetings Desktop App or Webex Productivity Tools.
  • Upgrade or remove affected Webex software according to Cisco guidance.
  • Limit shared Windows workstation use where Webex authentication occurs.
  • Restrict local account access to trusted users until remediation is complete.

Validation and detection

  • Confirm whether Cisco Webex desktop software is installed on Windows endpoints.
  • Identify shared Windows systems with multiple interactive users.
  • Compare installed Webex versions against Cisco advisory guidance.
  • Verify remediation status after upgrades or software removal.
  • Check endpoint access policies for unnecessary local user accounts.
Prepared
Confidence
medium
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

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cwe · low confidence lookup

CWE-202: Exact CWE lookup

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cve · low confidence lookup

CVE-2021-1372 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N1.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2021-1372Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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
Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco Webex Productivity Toolsn/aListed
Weakness

CWE details

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

CWE-202 · source CWE mapping

Exposure of Sensitive Information Through Data Queries

Exposure of Sensitive Information Through Data Queries represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.