CVE-2023-36955Network attack vector

Memory corruption via File parameter stack overflow

Published Oct 16, 2023 · Updated Sep 16, 2024

Stack overflow in TOTOLINK CP300+ 5.2cu.7594_B20200910 and earlier allows remote attackers to corrupt memory via a crafted File parameter. UploadCustomModule fails to constrain attacker-controlled File data before it exceeds the bounds of a stack buffer. Network access is sufficient without authentication or user interaction, and the resulting corruption can terminate the service or alter execution.

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

What happened

Stack overflow in TOTOLINK CP300+ 5.2cu.7594_B20200910 and earlier allows remote attackers to corrupt memory via a crafted File parameter. UploadCustomModule fails to constrain attacker-controlled File data before it exceeds the bounds of a stack buffer. Network access is sufficient without authentication or user interaction, and the resulting corruption can terminate the service or alter execution.

The record

CVE
CVE-2023-36955
Published
Oct 16, 2023
Updated
Sep 16, 2024
Vendor
TOTOLINK
Product
CP300+
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record 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=5.2cu.7594_b20200910

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · CP300+version=5.2cu.7594_b20200910

Published CVSS scores

9.8NIST NVDCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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