CVE-2025-5105Public exploitNetwork attack vector

Memory disclosure via unsanitized connection buffers

Published May 23, 2025 · Updated May 23, 2025

Heap data exposure in the TCP 7777 service of TOZED ZLT W51 firmware 1.4.0 through 1.4.2 allows remote attackers to read stale memory. The service reuses unsanitized server-side connection buffers and returns fragments of a previous client's data after crafted protocol version bytes alter the leak window. No authentication is required on the local network; Internet reachability depends on port 7777 exposure, and repeated probing can hang the service.

CVSS severity7.3
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap data exposure in the TCP 7777 service of TOZED ZLT W51 firmware 1.4.0 through 1.4.2 allows remote attackers to read stale memory. The service reuses unsanitized server-side connection buffers and returns fragments of a previous client's data after crafted protocol version bytes alter the leak window. No authentication is required on the local network; Internet reachability depends on port 7777 exposure, and repeated probing can hang the service.

The record

CVE
CVE-2025-5105
Published
May 23, 2025
Updated
May 23, 2025
Vendor
Tozed Kangwei Tech Co., Ltd.
Product
ZLT W51
Classifications
CWE-244, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 23, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=1.4.0
  2. Affected versionversion=1.4.1
  3. Affected versionversion=1.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tozed Kangwei Tech Co., Ltd. · ZLT W51version=1.4.0; version=1.4.1; version=1.4.2

Published CVSS scores

7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
6.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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-244Improper Clearing of Heap Memory Before Release ('Heap Inspection')
T1210Exploitation of Remote Services

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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