CVE-2023-48221Network attack vector

Client crash via SDP format string

Published Nov 20, 2023 · Updated Aug 2, 2024

Format string injection in Wire AVS before 9.2.22 and 9.3.0 through 9.3.4 allows remote authenticated users to crash the client. In bundle_update in src/sdp/bundle.c, mbuf_printf treats the received SDP group attribute as its format string instead of passing it as string data. Exploitation requires an attacker-controlled voice or video call and a victim who accepts it; a crash is demonstrated, while code execution remains an unverified potential impact.

CVSS severity7.3
High
EPSS probability0.88%
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 9.2.22 and 9.3.0 through 9.3.4 allows remote authenticated users to crash the client. In bundle_update in src/sdp/bundle.c, mbuf_printf treats the received SDP group attribute as its format string instead of passing it as string data. Exploitation requires an attacker-controlled voice or video call and a victim who accepts it; a crash is demonstrated, while code execution remains an unverified potential impact.

The record

CVE
CVE-2023-48221
Published
Nov 20, 2023
Updated
Aug 2, 2024
Vendor
Wire Swiss GmbH
Product
Wire Audio, Video, and Signaling (AVS)
Classifications
CWE-134, CAPEC-135, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=< 9.2.22
  2. Affected versionversion=>= 9.3.0, < 9.3.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wire Swiss GmbH · Wire Audio, Video, and Signaling (AVS)version=< 9.2.22; version=>= 9.3.0, < 9.3.5

Published CVSS scores

7.3GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:N/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-134Use of Externally-Controlled Format String
CAPEC-135Format String Injection
T1203Exploitation for Client Execution

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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