CVE-2026-0840Public exploitNetwork attack vector

Authenticated service interruption via unchecked timestart copy

Published Jan 11, 2026 · Updated Jan 11, 2026

Buffer overflow in UTT 进取 520W 1.7.7-180627 allows remote authenticated users to interrupt service via a crafted timestart value. The formConfigNoticeConfig handler passes the unbounded timestart parameter to strcpy, copying it into a fixed destination without a bounds check. An authenticated web session is required, and the public proof of concept targets availability; the resulting failure mode is not published.

CVSS severity8.8
High
EPSS probability4.08%
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 UTT 进取 520W 1.7.7-180627 allows remote authenticated users to interrupt service via a crafted timestart value. The formConfigNoticeConfig handler passes the unbounded timestart parameter to strcpy, copying it into a fixed destination without a bounds check. An authenticated web session is required, and the public proof of concept targets availability; the resulting failure mode is not published.

The record

CVE
CVE-2026-0840
Published
Jan 11, 2026
Updated
Jan 11, 2026
Vendor
Shanghai Aitai Technology Co., Ltd.
Product
进取 520W
Classifications
CWE-119, CWE-120, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 11, 2026Record 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=1.7.7-180627

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shanghai Aitai Technology Co., Ltd. · 进取 520Wversion=1.7.7-180627

Published CVSS scores

8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

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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