CVE-2023-40848Network attack vector

Memory corruption via undisclosed sub_7D858 overflow

Published Aug 30, 2023 · Updated Oct 2, 2024

Buffer overflow in the sub_7D858 function in Tenda AC6 firmware 1.0BR_V15.03.05.16_multi_TD01.bin allows remote attackers to corrupt memory. The public record identifies sub_7D858 as the vulnerable locus but does not disclose the input, buffer, or unchecked operation that causes the overflow. Network access without authentication or user interaction is sufficient; the disclosed record does not establish whether the result is a crash or code execution.

CVSS severity9.8
Critical
EPSS probability0.68%
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 the sub_7D858 function in Tenda AC6 firmware 1.0BR_V15.03.05.16_multi_TD01.bin allows remote attackers to corrupt memory. The public record identifies sub_7D858 as the vulnerable locus but does not disclose the input, buffer, or unchecked operation that causes the overflow. Network access without authentication or user interaction is sufficient; the disclosed record does not establish whether the result is a crash or code execution.

The record

CVE
CVE-2023-40848
Published
Aug 30, 2023
Updated
Oct 2, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC6
Classifications
CWE-787
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 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_multi_td01.bin

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC6version=1.0br_v15.03.05.16_multi_td01.bin

Published CVSS scores

9.8NIST NVDCVSS: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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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