CVE-2023-2906Public exploitNetwork attack vector

Packet-analysis crash via zero CP2179 record count

Published Aug 25, 2023 · Updated Nov 3, 2025

Divide by zero in the CP2179 dissector in Wireshark 2.0.0 through 4.0.7 allows attackers to crash packet analysis via crafted packets. In dissect_response_frame, a TIMETAG_INFO_RESPONSE byte supplies num_records without a zero check before numberofcharacters minus one is divided by it. The path requires CP2179 decoding of injected traffic or a crafted capture, and termination interrupts Wireshark, TShark, or a libwireshark consumer.

CVSS severity6.5
Medium
EPSS probability2.79%
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

Divide by zero in the CP2179 dissector in Wireshark 2.0.0 through 4.0.7 allows attackers to crash packet analysis via crafted packets. In dissect_response_frame, a TIMETAG_INFO_RESPONSE byte supplies num_records without a zero check before numberofcharacters minus one is divided by it. The path requires CP2179 decoding of injected traffic or a crafted capture, and termination interrupts Wireshark, TShark, or a libwireshark consumer.

The record

CVE
CVE-2023-2906
Published
Aug 25, 2023
Updated
Nov 3, 2025
Vendor
Wireshark Foundation
Product
Wireshark
Classifications
CWE-369, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 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

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=2.0.0 <=4.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wireshark Foundation · Wiresharkversion=2.0.0 <=4.0.7

Published CVSS scores

6.5NIST National Vulnerability DatabaseCVSS: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.

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 exploitPublished

Weakness, pattern, technique

CWE-369Divide By Zero
T1499.004Application or System Exploitation

Public exploit references

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