CVE-2023-6174Public exploitNetwork attack vector

Analyzer crash via malformed SSH packet

Published Nov 16, 2023 · Updated Mar 27, 2026

Out-of-bounds read in Wireshark 4.0.0 through 4.0.10 allows remote attackers to crash the analyzer via malformed SSH traffic. The SSH dissector mishandles malformed packet data and corrupts its strict allocator canary; the exact out-of-bounds read operation is undisclosed. Exploitation requires Wireshark or TShark to dissect an injected packet or a user to open a crafted capture, causing a crash or excessive CPU consumption.

CVSS severity6.3
Medium
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Wireshark 4.0.0 through 4.0.10 allows remote attackers to crash the analyzer via malformed SSH traffic. The SSH dissector mishandles malformed packet data and corrupts its strict allocator canary; the exact out-of-bounds read operation is undisclosed. Exploitation requires Wireshark or TShark to dissect an injected packet or a user to open a crafted capture, causing a crash or excessive CPU consumption.

The record

CVE
CVE-2023-6174
Published
Nov 16, 2023
Updated
Mar 27, 2026
Vendor
Wireshark Foundation
Product
Wireshark
Classifications
CWE-125, CWE-74, T1499.004, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2026Record 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=4.0.0 <4.0.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wireshark Foundation · Wiresharkversion=4.0.0 <4.0.11

Published CVSS scores

6.3GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
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.

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-125Out-of-bounds Read
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1499.004Application or System Exploitation
T1204.002Malicious File

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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