CVE-2020-3131Network attack vector

Client crash via malformed adaptive card

Published Jan 26, 2020 · Updated Nov 15, 2024

Denial of service in Cisco Webex Teams client for Windows 3.0.13131 allows remote authenticated users to crash the client. The adaptive-card receiver insufficiently validates malicious card content before processing it, allowing a crafted card to trigger continuous client crashes. Exploitation requires a valid developer account and delivery to an existing user's client; the reported consequence is loss of client availability.

CVSS severity6.5
Medium
EPSS probability2.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Cisco Webex Teams client for Windows 3.0.13131 allows remote authenticated users to crash the client. The adaptive-card receiver insufficiently validates malicious card content before processing it, allowing a crafted card to trigger continuous client crashes. Exploitation requires a valid developer account and delivery to an existing user's client; the reported consequence is loss of client availability.

The record

CVE
CVE-2020-3131
Published
Jan 26, 2020
Updated
Nov 15, 2024
Vendor
ClamAV
Product
Webex App
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 26, 2020CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0.13131

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ClamAV · Webex Appversion=3.0.13131

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:N/A:P
6.5Cisco Systems, Inc.CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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