CVE-2023-33670Public exploitNetwork attack vector

Remote code execution via unbounded time parsing

Published Jun 2, 2023 · Updated Jan 8, 2025

Stack-based buffer overflow in Tenda AC8 V4.0 firmware 16.03.34.06 allows remote attackers to corrupt memory via a crafted time value. The /goform/SetSysTimeCfg handler sub_4A79EC passes the untrusted value to sscanf with unbounded scansets that write into fixed-size stack buffers. No authentication or user interaction is required; the overwrite can crash the router's HTTP service or support arbitrary code execution.

CVSS severity9.8
Critical
EPSS probability1.06%
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 AC8 V4.0 firmware 16.03.34.06 allows remote attackers to corrupt memory via a crafted time value. The /goform/SetSysTimeCfg handler sub_4A79EC passes the untrusted value to sscanf with unbounded scansets that write into fixed-size stack buffers. No authentication or user interaction is required; the overwrite can crash the router's HTTP service or support arbitrary code execution.

The record

CVE
CVE-2023-33670
Published
Jun 2, 2023
Updated
Jan 8, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 2025Record 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
9.8CISA-ADPCVSS: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-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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