CVE-2026-2910Public exploitNetwork attack vector

Authenticated code execution via unbounded error formatting

Published Feb 22, 2026 · Updated Feb 22, 2026

Stack-based buffer overflow in Tenda HG9 300001138 allows remote authenticated users to execute arbitrary code through IPv6 ping input. The formPing6 error path passes the user-controlled pingAddr value to sprintf when ping6 returns a “ping6: bad” error, overflowing a 512-byte stack buffer. Low-privileged web access and a malformed value exceeding the buffer are required; exploitation can crash httpd or overwrite its return address.

CVSS severity8.8
High
EPSS probability2.60%
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 HG9 300001138 allows remote authenticated users to execute arbitrary code through IPv6 ping input. The formPing6 error path passes the user-controlled pingAddr value to sprintf when ping6 returns a “ping6: bad” error, overflowing a 512-byte stack buffer. Low-privileged web access and a malformed value exceeding the buffer are required; exploitation can crash httpd or overwrite its return address.

The record

CVE
CVE-2026-2910
Published
Feb 22, 2026
Updated
Feb 22, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
HG9
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 22, 2026Record 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=300001138

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · HG9version=300001138

Published CVSS scores

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
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

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
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

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