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CVE-2021-1503

Cisco Webex Network Recording Player and Webex Player Memory Corruption Vulnerability

HIGH
7.8
CVSS Score
Published: June 4, 2021 at 04:45 PM UTC
Updated: June 17, 2026 at 03:31 AM UTC
3 products affected across 1 vendorWebex Meetings ServerWebex PlayerWebex Meetings

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Severity
HIGH7.8
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

A vulnerability in Cisco Webex Network Recording Player for Windows and MacOS and Cisco Webex Player for Windows and MacOS could allow an attacker to execute arbitrary code on an affected system. This vulnerability is due to insufficient validation of values in Webex recording files that are in either Advanced Recording Format (ARF) or Webex Recording Format (WRF). An attacker could exploit this vulnerability by sending a user a malicious ARF or WRF file through a link or email attachment and persuading the user to open the file with the affected software on the local system. A successful exploit could allow the attacker to execute arbitrary code on the affected system with the privileges of the targeted user.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Webex Meetings Server· Cisco
95%
4.0
Webex Player· Cisco
95%
v < 41.2
Affected range stops below 41.2, so it looks safe — our inference, not a vendor statement
Webex Meetings· Cisco
60%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisoryx_refsource_CISCO
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-player-rCFDeVj2

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHcisco
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-119CWE-787

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