CVE-2023-33485Public exploitNetwork attack vector

Authenticated code execution via unchecked sprintf

Published May 31, 2023 · Updated Jan 10, 2025

Stack-based buffer overflow in TOTOLINK X5000R firmware allows remote authenticated users to execute arbitrary code. The addEffect handler passes attacker-controlled sPort or ePort data to sprintf without checking its length, overwriting the stack and enabling control-flow hijacking. A valid management session and addEffect set to 1 are required; the affected builds are 9.1.0u.6118_B20201102 and 9.1.0u.6369_B20230113.

CVSS severity8.8
High
EPSS probability1.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in TOTOLINK X5000R firmware allows remote authenticated users to execute arbitrary code. The addEffect handler passes attacker-controlled sPort or ePort data to sprintf without checking its length, overwriting the stack and enabling control-flow hijacking. A valid management session and addEffect set to 1 are required; the affected builds are 9.1.0u.6118_B20201102 and 9.1.0u.6369_B20230113.

The record

CVE
CVE-2023-33485
Published
May 31, 2023
Updated
Jan 10, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 31, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 10, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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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