CVE-2021-32755Network attack vector

WebSocket traffic interception via missing certificate pinning

Published Jul 13, 2021 · Updated Aug 3, 2024

Improper certificate validation in Wire iOS Transport 3.8.2 allows man-in-the-middle attackers to read or alter WebSocket traffic. The iOS 13-or-later WebSocket implementation establishes TLS without configuring the available certificate-pinning enforcement. Reaching the affected channel requires an authenticated Wire session and a network interception position, exposing message confidentiality and integrity.

CVSS severity5.4
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Wire iOS Transport 3.8.2 allows man-in-the-middle attackers to read or alter WebSocket traffic. The iOS 13-or-later WebSocket implementation establishes TLS without configuring the available certificate-pinning enforcement. Reaching the affected channel requires an authenticated Wire session and a network interception position, exposing message confidentiality and integrity.

The record

CVE
CVE-2021-32755
Published
Jul 13, 2021
Updated
Aug 3, 2024
Vendor
Wire Swiss GmbH
Product
Wire iOS Transport
Classifications
CWE-295, T1557
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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== 3.8.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wire Swiss GmbH · Wire iOS Transportversion== 3.8.2

Published CVSS scores

5.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:P/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

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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