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Webex Meetings Server CVE-2018-15422

HIGH
Improper Input Validation (CWE-20)
2018-10-05 psirt@cisco.com
RCE Microsoft Cisco Webex Meetings Server Webex Business Suite 32 Webex Meetings Online Webex Business Suite 33
7.8
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-20
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Impact

CVSS score of 7.8 (HIGH). Attack characteristics: local attack vector, low complexity, no privileges required, user interaction required.
Exploit ScenarioDerived

Successful exploitation could compromise the high-severity affected system.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 2.0% exploitation probability (EPSS)

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AnalysisAI

A vulnerability in the Cisco Webex Network Recording Player for Microsoft Windows and the Cisco Webex Player for Microsoft Windows could allow an attacker to execute arbitrary code on an affected. Rated high severity (CVSS 7.8), this vulnerability is no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-20. A vulnerability in the Cisco Webex Network Recording Player for Microsoft Windows and the Cisco Webex Player for Microsoft Windows could allow an attacker to execute arbitrary code on an affected system. The vulnerability exist because the affected software improperly validates Advanced Recording Format (ARF) and Webex Recording Format (WRF) files. An attacker could exploit this vulnerability by sending a user a malicious ARF or WRF file via a link or an email attachment and persuading the user to open the file by using the affected software. A successful exploit could allow the attacker to execute arbitrary code on the affected system. Affected products include: Cisco Webex Meetings Online, Cisco Webex Meetings Server, Cisco Webex Business Suite 32, Cisco Webex Business Suite 33.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 7.8 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionNVD

A vulnerability in the Cisco Webex Network Recording Player for Microsoft Windows and the Cisco Webex Player for Microsoft Windows could allow an attacker to execute arbitrary code on an affected system. The vulnerability exist because the affected software improperly validates Advanced Recording Format (ARF) and Webex Recording Format (WRF) files. An attacker could exploit this vulnerability by sending a user a malicious ARF or WRF file via a link or an email attachment and persuading the user to open the file by using the affected software. A successful exploit could allow the attacker to execute arbitrary code on the affected system.

Threat Intelligence Overview

EPSS Score
2.0%
Top 21% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 2.0%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

41
Low Medium High Critical
KEV: 0
EPSS: +2
CVSS: +39
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)NVD

cpe:2.3:a:cisco:webex_meetings_online:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.5:maintenance_release2_patch1:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.5:maintenance_release5_patch1:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.5:maintenance_release6_patch2:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.5:maintenance_release6_patch3:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.5:maintenance_release6_patch4:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.5.1.29:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.6:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.6:maintenance_release1_patch1:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.6:maintenance_release2_patch1:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.6:maintenance_release3_patch1:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.6:maintenance_release3_patch2:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.7:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.7:base:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.7:maintenance_release1_patch1:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.7:maintenance_release2_patch1:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.7.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.8:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings_server:2.8:base:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_business_suite_32:*:*:*:*:*:*:*:*
+ 1 more

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Same weakness CWE-20 – Improper Input Validation

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Same technique RCE

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References

Advisories & patches
ADVISORY https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180919-webex REF http://www.securityfocus.com/bid/105374 REF http://www.securitytracker.com/id/1041689

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