CVE-2021-40180Public exploitNetwork attack vector

Address-book disclosure via unchecked contact searches

Published Jul 26, 2022 · Updated Aug 4, 2024

Information disclosure in Tencent WeChat 8.0.10 for Android and iOS allows attackers to read address-book data through a mini program. The wx.searchContacts API does not enforce separate contact authorization or limit repeated phone-number queries, enabling sequential enumeration. Exploitation requires a user to click a mini-program control and WeChat to already hold device contact permission; the mini program can then upload matched contact data.

CVSS severity7.5
High
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Tencent WeChat 8.0.10 for Android and iOS allows attackers to read address-book data through a mini program. The wx.searchContacts API does not enforce separate contact authorization or limit repeated phone-number queries, enabling sequential enumeration. Exploitation requires a user to click a mini-program control and WeChat to already hold device contact permission; the mini program can then upload matched contact data.

The record

CVE
CVE-2021-40180
Published
Jul 26, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-200, T1636.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 26, 2022CVE 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

7.5NIST NVDCVSS: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-200Exposure of Sensitive Information to an Unauthorized Actor
T1636.003Protected User Data: Contact List

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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