CVE-2023-0667Public exploitNetwork attack vector

Process crash via unchecked MSMMS length arithmetic

Published Jun 7, 2023 · Updated Nov 3, 2025

Heap buffer over-read in Wireshark 4.0.5 and earlier allows context-dependent attackers to crash the process via crafted MSMMS packets. The MSMMS dissector derives length_remaining from a packet field, passes a four-byte UTF-16 slice that finalizes into three bytes, then directs format_text to read four bytes. The public reproducer triggers the error only under fuzzshark, not TShark, and NVD bounds the published impact to a process crash requiring user interaction.

CVSS severity6.5
Medium
EPSS probability2.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer over-read in Wireshark 4.0.5 and earlier allows context-dependent attackers to crash the process via crafted MSMMS packets. The MSMMS dissector derives length_remaining from a packet field, passes a four-byte UTF-16 slice that finalizes into three bytes, then directs format_text to read four bytes. The public reproducer triggers the error only under fuzzshark, not TShark, and NVD bounds the published impact to a process crash requiring user interaction.

The record

CVE
CVE-2023-0667
Published
Jun 7, 2023
Updated
Nov 3, 2025
Vendor
Wireshark Foundation
Product
Wireshark
Classifications
CWE-787, CWE-122
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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=0 <=3.6.13
  2. Affected versionversion=0 <=4.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wireshark Foundation · Wiresharkversion=0 <=3.6.13; version=0 <=4.0.5

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-122Heap-based Buffer Overflow

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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