CVE-2025-8810Public exploitNetwork attack vector

Authenticated code execution via unchecked firewallEn copy

Published Aug 10, 2025 · Updated Aug 12, 2025

Stack-based buffer overflow in Tenda AC20 16.03.08.05 allows remote authenticated users to execute code or crash the router via firewallEn. The /goform/SetFirewallCfg handler copies attacker-controlled firewallEn data into a 152-byte stack buffer with strcpy after checking only that its length exceeds three bytes, without enforcing an upper bound. Access to the network management interface and low privileges are required; an oversized request can corrupt memory, crash the service, or execute code.

CVSS severity8.8
High
EPSS probability1.06%
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

Stack-based buffer overflow in Tenda AC20 16.03.08.05 allows remote authenticated users to execute code or crash the router via firewallEn. The /goform/SetFirewallCfg handler copies attacker-controlled firewallEn data into a 152-byte stack buffer with strcpy after checking only that its length exceeds three bytes, without enforcing an upper bound. Access to the network management interface and low privileges are required; an oversized request can corrupt memory, crash the service, or execute code.

The record

CVE
CVE-2025-8810
Published
Aug 10, 2025
Updated
Aug 12, 2025
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC20
Classifications
CWE-121, CWE-119, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=16.03.08.05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC20version=16.03.08.05

Published CVSS scores

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
8.8VulDBCVSS: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-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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