CVE-2021-41193Network attack vector

Client crash or code execution via format string

Published Mar 1, 2022 · Updated Apr 23, 2025

Format-string injection in Wire AVS before 7.1.12 allows remote attackers to crash the calling client or execute arbitrary code. The public advisory and its broad import commit do not identify the vulnerable function or protocol field, disclosing only that remote data becomes a printf-style format argument. No authentication or user interaction is required, and exploitation can interrupt a call or run code in the affected client process.

CVSS severity9.8
Critical
EPSS probability2.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Format-string injection in Wire AVS before 7.1.12 allows remote attackers to crash the calling client or execute arbitrary code. The public advisory and its broad import commit do not identify the vulnerable function or protocol field, disclosing only that remote data becomes a printf-style format argument. No authentication or user interaction is required, and exploitation can interrupt a call or run code in the affected client process.

The record

CVE
CVE-2021-41193
Published
Mar 1, 2022
Updated
Apr 23, 2025
Vendor
Wire Swiss GmbH
Product
Wire Audio, Video, and Signaling (AVS)
Classifications
CWE-134, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record 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=< 7.1.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wire Swiss GmbH · Wire Audio, Video, and Signaling (AVS)version=< 7.1.12

Published CVSS scores

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-134Use of Externally-Controlled Format String
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

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Your stack

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