CVE-2020-11500Public exploitNetwork attack vector

Meeting-media pattern disclosure via shared AES-ECB key

Published Apr 3, 2020 · Updated Aug 4, 2024

Cryptographic weakness in Zoom Client for Meetings 4.6.9 and earlier allows attackers to expose patterns in encrypted meeting media. A single AES-128 key encrypts every participant's audio and video in ECB mode, preserving repeated plaintext patterns in captured ciphertext. Exploitation requires access to meeting traffic and its shared key; the published impact is limited to meeting-media confidentiality.

CVSS severity7.5
High
EPSS probability1.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cryptographic weakness in Zoom Client for Meetings 4.6.9 and earlier allows attackers to expose patterns in encrypted meeting media. A single AES-128 key encrypts every participant's audio and video in ECB mode, preserving repeated plaintext patterns in captured ciphertext. Exploitation requires access to meeting traffic and its shared key; the published impact is limited to meeting-media confidentiality.

The record

CVE
CVE-2020-11500
Published
Apr 3, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-327, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
T1040Network Sniffing

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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