CVE-2025-8940Public exploitNetwork attack vector

Authenticated memory corruption via unchecked Time copy

Published Aug 14, 2025 · Updated Aug 15, 2025

Buffer overflow in the AC20 web interface through 16.03.08.12 allows remote authenticated users to corrupt memory via the Time parameter. The saveParentControlInfo handler passes the request's Time value to strcpy without enforcing the destination buffer's capacity. Access requires valid web-management credentials; an overlong value can corrupt httpd process memory, causing a crash or control-flow corruption.

CVSS severity8.8
High
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Buffer overflow in the AC20 web interface through 16.03.08.12 allows remote authenticated users to corrupt memory via the Time parameter. The saveParentControlInfo handler passes the request's Time value to strcpy without enforcing the destination buffer's capacity. Access requires valid web-management credentials; an overlong value can corrupt httpd process memory, causing a crash or control-flow corruption.

The record

CVE
CVE-2025-8940
Published
Aug 14, 2025
Updated
Aug 15, 2025
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC20
Classifications
CWE-119, CWE-120, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16.03.08.0
  2. Affected versionversion=16.03.08.1
  3. Affected versionversion=16.03.08.10
  4. Affected versionversion=16.03.08.11
  5. Affected versionversion=16.03.08.12
  6. Affected versionversion=16.03.08.2
  7. Affected versionversion=16.03.08.3
  8. Affected versionversion=16.03.08.4
  9. Affected versionversion=16.03.08.5
  10. Affected versionversion=16.03.08.6
  11. Affected versionversion=16.03.08.7
  12. Affected versionversion=16.03.08.8
  13. Affected versionversion=16.03.08.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC20version=16.03.08.0; version=16.03.08.1; version=16.03.08.10; version=16.03.08.11; version=16.03.08.12; version=16.03.08.2; version=16.03.08.3; version=16.03.08.4; version=16.03.08.5; version=16.03.08.6; version=16.03.08.7; version=16.03.08.8; version=16.03.08.9

Published CVSS scores

7.4VulDB CNACVSS: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
9.0VulDB CNAAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/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
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')
T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo