CVE-2025-11091Public exploitNetwork attack vector

Authenticated code execution via unbounded route list

Published Sep 28, 2025 · Updated Sep 28, 2025

Stack buffer overflow in Tenda AC21 Firmware 16.03.08.0 through 16.03.08.16 allows remote authenticated users to crash the router or execute code. The SetStaticRouteCfg handler passes the unbounded list parameter to sscanf with four unbounded string conversions, overflowing stack buffers. A valid management session is required; a crafted HTTP POST can interrupt routing service or compromise the device.

CVSS severity8.8
High
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in Tenda AC21 Firmware 16.03.08.0 through 16.03.08.16 allows remote authenticated users to crash the router or execute code. The SetStaticRouteCfg handler passes the unbounded list parameter to sscanf with four unbounded string conversions, overflowing stack buffers. A valid management session is required; a crafted HTTP POST can interrupt routing service or compromise the device.

The record

CVE
CVE-2025-11091
Published
Sep 28, 2025
Updated
Sep 28, 2025
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC21 Firmware
Classifications
CWE-119, CWE-120, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 28, 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=16.03.08.13
  7. Affected versionversion=16.03.08.14
  8. Affected versionversion=16.03.08.15
  9. Affected versionversion=16.03.08.16
  10. Affected versionversion=16.03.08.2
  11. Affected versionversion=16.03.08.3
  12. Affected versionversion=16.03.08.4
  13. Affected versionversion=16.03.08.5
  14. Affected versionversion=16.03.08.6
  15. Affected versionversion=16.03.08.7
  16. Affected versionversion=16.03.08.8
  17. Affected versionversion=16.03.08.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC21 Firmwareversion=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=16.03.08.13; version=16.03.08.14; version=16.03.08.15; version=16.03.08.16; 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

7.4VulDBCVSS: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
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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