CVE-2022-37839Public exploitNetwork attack vector

Unauthenticated memory corruption via CSAuthUrl overflow

Published Sep 6, 2022 · Updated Aug 3, 2024

Buffer overflow in cstecgi.cgi in TOTOLINK A860R 4.1.2cu.5182_B20201027 allows remote attackers to corrupt process memory. The handler passes the unfiltered CSAuthUrl value to sprintf, which copies it directly into a fixed local buffer without a length check. No credentials or user interaction are required to send the crafted GET request, while public evidence establishes memory corruption but not reliable code execution.

CVSS severity9.8
Critical
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in cstecgi.cgi in TOTOLINK A860R 4.1.2cu.5182_B20201027 allows remote attackers to corrupt process memory. The handler passes the unfiltered CSAuthUrl value to sprintf, which copies it directly into a fixed local buffer without a length check. No credentials or user interaction are required to send the crafted GET request, while public evidence establishes memory corruption but not reliable code execution.

The record

CVE
CVE-2022-37839
Published
Sep 6, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 6, 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

9.8NVDCVSS: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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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