CVE-2022-36465Public exploitNetwork attack vector

Root code execution via unbounded pppoeUser formatting

Published Aug 25, 2022 · Updated Aug 3, 2024

Stack overflow in TOTOLINK A3700R 9.1.2u.6134_B20201202 allows remote attackers to execute code through a crafted pppoeUser value. The cstecgi.cgi setOpModeCfg request passes the attacker-controlled pppoeUser string to sprintf without a length limit, overflowing a stack destination and permitting control-flow hijacking. The HTTP proof of concept requires no authorization; successful exploitation runs a root shell, while failed attempts can crash the router service.

CVSS severity7.8
High
EPSS probability0.35%
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 A3700R 9.1.2u.6134_B20201202 allows remote attackers to execute code through a crafted pppoeUser value. The cstecgi.cgi setOpModeCfg request passes the attacker-controlled pppoeUser string to sprintf without a length limit, overflowing a stack destination and permitting control-flow hijacking. The HTTP proof of concept requires no authorization; successful exploitation runs a root shell, while failed attempts can crash the router service.

The record

CVE
CVE-2022-36465
Published
Aug 25, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

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

7.8NIST NVDCVSS:3.1/AV:L/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.

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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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