Security readout for executives and security teams
Plain-English summary
A malicious Webex recording file can compromise a Windows user who opens it in affected Cisco Webex playback software. The issue is serious because successful exploitation can run code with that user’s privileges, but the attacker must persuade the user to open a crafted ARF or WRF file.
Executive priority
Treat as a high-priority endpoint exposure if Webex playback software is deployed. It requires user interaction, so business urgency depends on installed footprint and recording-file workflows. Remediate through Cisco guidance and reduce exposure to untrusted recording files.
Technical view
CVE-2020-3573 covers Cisco Webex Network Recording Player and Cisco Webex Player for Windows. Insufficient validation of elements in ARF or WRF recordings can lead to arbitrary code execution. CVSS 3.1 is 7.8 with local attack vector, low complexity, no privileges, required user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely on Windows endpoints with Cisco Webex Network Recording Player or Cisco Webex Player installed, especially where users receive or open ARF or WRF recording files from email, links, vendors, customers, or archived meetings.
Exploitation context
The provided sources describe a social-engineering file-opening scenario: an attacker sends a malicious ARF or WRF file by link or attachment and convinces a user to open it locally. The bundle does not show CISA KEV listing or other evidence of active exploitation.
Researcher notes
The record names CWE-119 and describes parser validation failure in Webex ARF/WRF recording handling. Public details in the bundle are sufficient for exposure management, but not enough to identify exact affected versions or fixed releases without Cisco advisory details.
Mitigation direction
- Review Cisco’s advisory for affected and fixed software details.
- Update or remove affected Webex playback software where present.
- Warn users not to open unexpected ARF or WRF files.
- Restrict or flag ARF and WRF attachments where operationally feasible.
Validation and detection
- Inventory Windows endpoints for Cisco Webex Network Recording Player and Cisco Webex Player.
- Compare installed versions against Cisco advisory guidance.
- Identify users or workflows that still handle ARF or WRF files.
- Review mail and web controls for ARF and WRF file handling.
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-119: Exact CWE lookup
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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-2020-3573 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20201104 Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution VulnerabilitiesCVE reference · vendor-advisory, x_refsource_CISCO
- https://www.zerodayinitiative.com/advisories/ZDI-20-1362/CVE reference · x_refsource_MISC
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 Restriction of Operations within the Bounds of a Memory Buffer
Improper Restriction of Operations within the Bounds of a Memory Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.