CVE-2026-2191Public exploitNetwork attack vector

Authenticated web-service crash via configuration buffer overflow

Published Feb 8, 2026 · Updated Feb 8, 2026

Stack-based buffer overflow in Tenda AC9 15.03.06.42_multi allows remote authenticated users to crash the web service using an uploaded configuration. The formGetDdosDefenceList and formGetFirewallCfg handlers parse an oversized security.ddos.map value from an uploaded configuration with unbounded sscanf conversions into fixed-size stack buffers. Administrative access to upload a configuration is required; the demonstrated consequence is a persistent web-service crash, while code execution is reported but not demonstrated.

CVSS severity7.2
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Stack-based buffer overflow in Tenda AC9 15.03.06.42_multi allows remote authenticated users to crash the web service using an uploaded configuration. The formGetDdosDefenceList and formGetFirewallCfg handlers parse an oversized security.ddos.map value from an uploaded configuration with unbounded sscanf conversions into fixed-size stack buffers. Administrative access to upload a configuration is required; the demonstrated consequence is a persistent web-service crash, while code execution is reported but not demonstrated.

The record

CVE
CVE-2026-2191
Published
Feb 8, 2026
Updated
Feb 8, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC9
Classifications
CWE-121, CWE-119, T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 8, 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=15.03.06.42_multi

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC9version=15.03.06.42_multi

Published CVSS scores

7.2VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
8.3VulDBAV:N/AC:L/Au:M/C:C/I:C/A:C
7.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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