CVE-2023-51956Public exploitNetwork attack vector

Unauthenticated memory corruption via unchecked IPTV VLAN

Published Jan 10, 2024 · Updated Jun 3, 2025

Stack-based buffer overflow in Tenda AX1803 firmware 1.0.0.1 allows remote attackers to corrupt memory via a crafted IPTV VLAN value. The formSetIptv handler processes the iptv.city.vlan parameter without enforcing the destination stack buffer bounds. The attack requires neither authentication nor user interaction and exposes the router to process crashes and control-flow corruption.

CVSS severity9.8
Critical
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Stack-based buffer overflow in Tenda AX1803 firmware 1.0.0.1 allows remote attackers to corrupt memory via a crafted IPTV VLAN value. The formSetIptv handler processes the iptv.city.vlan parameter without enforcing the destination stack buffer bounds. The attack requires neither authentication nor user interaction and exposes the router to process crashes and control-flow corruption.

The record

CVE
CVE-2023-51956
Published
Jan 10, 2024
Updated
Jun 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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.

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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-787Out-of-bounds Write
T1190Exploit Public-Facing Application

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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