CVE-2021-21301Network attack vector

Privacy video leak via stale capture state

Published Feb 11, 2021 · Updated Aug 3, 2024

Information exposure in Wire for iOS before 3.75 allows remote authenticated users to stream camera video after disabling it in a call. SelfVideoPreviewView failed to update AVS capture when the self video stream changed to a stopped state, so capture continued after the user disabled video. The issue requires a video call and an enabled-then-disabled camera sequence; impact is unintended disclosure of live camera content to call participants.

CVSS severity4.3
Medium
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Information exposure in Wire for iOS before 3.75 allows remote authenticated users to stream camera video after disabling it in a call. SelfVideoPreviewView failed to update AVS capture when the self video stream changed to a stopped state, so capture continued after the user disabled video. The issue requires a video call and an enabled-then-disabled camera sequence; impact is unintended disclosure of live camera content to call participants.

The record

CVE
CVE-2021-21301
Published
Feb 11, 2021
Updated
Aug 3, 2024
Vendor
Wire Swiss GmbH
Product
Wire iOS
Classifications
CWE-200, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 11, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 3.75

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wire Swiss GmbH · Wire iOSversion=< 3.75

Published CVSS scores

4.3NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
2.6GitHub Security AdvisoriesCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
4.3NVDAV:N/AC:M/Au:N/C:P/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.

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

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-200Exposure of Sensitive Information to an Unauthorized Actor
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo