CVE-2020-13393Public exploitNetwork attack vector

Remote code execution via unbounded strcpy

Published May 22, 2020 · Updated Aug 4, 2024

Stack-based buffer overflow in Tenda AC6, AC9, AC15, and AC18 router httpd allows remote attackers to execute arbitrary code. Affected builds are AC6 V1.0 15.03.05.19_multi_TD01, AC9 V1.0 15.03.05.19(6318)CN, AC9 V3.0 15.03.06.42_multi, AC15 V1.0 15.03.05.19_multi_TD01, and AC18 15.03.05.19(6318)_CN; the /goform/saveParentControlInfo handler copies deviceId and time POST values with unbounded strcpy into a stack buffer, overwriting its return address. Network access to httpd is sufficient under NVD's unauthenticated assessment; successful exploitation runs code on the router, while the published partial proof of concept demonstrates a crash.

CVSS severity9.8
Critical
EPSS probability3.20%
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 Tenda AC6, AC9, AC15, and AC18 router httpd allows remote attackers to execute arbitrary code. Affected builds are AC6 V1.0 15.03.05.19_multi_TD01, AC9 V1.0 15.03.05.19(6318)CN, AC9 V3.0 15.03.06.42_multi, AC15 V1.0 15.03.05.19_multi_TD01, and AC18 15.03.05.19(6318)_CN; the /goform/saveParentControlInfo handler copies deviceId and time POST values with unbounded strcpy into a stack buffer, overwriting its return address. Network access to httpd is sufficient under NVD's unauthenticated assessment; successful exploitation runs code on the router, while the published partial proof of concept demonstrates a crash.

The record

CVE
CVE-2020-13393
Published
May 22, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 22, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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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