CVE-2023-39670Network attack vector

Unauthenticated memory corruption via unsafe fgets call

Published Aug 18, 2023 · Updated Oct 7, 2024

Buffer overflow in Shenzhen Tenda Technology AC6 firmware 1.0BR_V15.03.05.16 allows remote attackers to corrupt device memory via network requests. The public record identifies fgets as the affected function but does not disclose its caller, request field, destination buffer, or the operation that causes the overwrite. Exploitation requires no authentication or user interaction, and CISA assesses the technical impact as total; no narrower execution or crash outcome is publicly documented.

CVSS severity9.8
Critical
EPSS probability0.76%
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 Shenzhen Tenda Technology AC6 firmware 1.0BR_V15.03.05.16 allows remote attackers to corrupt device memory via network requests. The public record identifies fgets as the affected function but does not disclose its caller, request field, destination buffer, or the operation that causes the overwrite. Exploitation requires no authentication or user interaction, and CISA assesses the technical impact as total; no narrower execution or crash outcome is publicly documented.

The record

CVE
CVE-2023-39670
Published
Aug 18, 2023
Updated
Oct 7, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC6
Classifications
CWE-120
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 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=1.0br_v15.03.05.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC6version=1.0br_v15.03.05.16

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

No public exploit references are available in this record.

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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