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Webex Teams CVE-2018-0387

HIGH
Improper Input Validation (CWE-20)
2018-07-18 psirt@cisco.com
8.8
CVSS 3.1 · NVD
View

Vulnerability Assessment

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

CVSS score of 8.8 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, user interaction required.

Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. 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 3.1% exploitation probability (EPSS)

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AnalysisAI

A vulnerability in Cisco Webex Teams (for Windows and macOS) could allow an unauthenticated, remote attacker to execute arbitrary code on the user's device, possibly with elevated privileges. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, 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.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-20. A vulnerability in Cisco Webex Teams (for Windows and macOS) could allow an unauthenticated, remote attacker to execute arbitrary code on the user's device, possibly with elevated privileges. The vulnerability occurs because Cisco Webex Teams does not properly sanitize input. An attacker could exploit the vulnerability by sending a user a malicious link and persuading the user to follow the link. A successful exploit could allow the attacker to execute arbitrary code on the user's system. Cisco Bug IDs: CSCvh66250. Affected products include: Cisco Webex Teams.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH
AV:N/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
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionNVD

A vulnerability in Cisco Webex Teams (for Windows and macOS) could allow an unauthenticated, remote attacker to execute arbitrary code on the user's device, possibly with elevated privileges. The vulnerability occurs because Cisco Webex Teams does not properly sanitize input. An attacker could exploit the vulnerability by sending a user a malicious link and persuading the user to follow the link. A successful exploit could allow the attacker to execute arbitrary code on the user's system. Cisco Bug IDs: CSCvh66250.

Threat Intelligence Overview

EPSS Score
3.1%
Top 14% exploitable
Data Quality
2 sources
Confidence: Low

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 3.1%
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
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

47
Low Medium High Critical
KEV: 0
EPSS: +3
CVSS: +44
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

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_teams:-:*:*:*:*:*:*:*
CVE-2019-1689 HIGH POC
7.3 Feb 25

A vulnerability in the client application for iOS of Cisco Webex Teams could allow an authenticated, remote attacker to

CVE-2025-20236 HIGH
8.8 Apr 16

A vulnerability in the custom URL parser of Cisco Webex App could allow an unauthenticated, remote attacker to persuade

CVE-2019-1939 HIGH
8.8 Sep 05

A vulnerability in the Cisco Webex Teams client for Windows could allow an unauthenticated, remote attacker to execute a

CVE-2018-0436 HIGH
8.7 Oct 05

A vulnerability in Cisco Webex Teams, formerly Cisco Spark, could allow an authenticated, remote attacker to view and mo

CVE-2020-3535 HIGH
8.4 Oct 08

A vulnerability in the loading mechanism of specific DLLs in the Cisco Webex Teams client for Windows could allow an aut

CVE-2021-1536 HIGH
7.8 Jun 04

A vulnerability in Cisco Webex Meetings Desktop App for Windows, Cisco Webex Meetings Server, Cisco Webex Network Record

CVE-2021-1502 HIGH
7.8 Jun 04

A vulnerability in Cisco Webex Network Recording Player for Windows and MacOS and Cisco Webex Player for Windows and Mac

CVE-2019-1636 HIGH
7.8 Jan 23

A vulnerability in the Cisco Webex Teams client, formerly Cisco Spark, could allow an attacker to execute arbitrary comm

CVE-2020-3155 HIGH
7.4 Mar 04

A vulnerability in the SSL implementation of the Cisco Intelligent Proximity solution could allow an unauthenticated, re

CVE-2024-20395 HIGH
7.3 Jul 17

A vulnerability in the media retrieval functionality of Cisco Webex App could allow an unauthenticated, adjacent attacke

CVE-2024-20396 MEDIUM
6.5 Jul 17

A vulnerability in the protocol handlers of Cisco Webex App could allow an unauthenticated, remote attacker to gain acce

CVE-2020-3131 MEDIUM
6.5 Jan 26

A vulnerability in the Cisco Webex Teams client for Windows could allow an authenticated, remote attacker to cause the c

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