CVE-2025-12273Public exploitNetwork attack vector

Unauthenticated memory corruption via oversized page parameter

Published Oct 27, 2025 · Updated Oct 27, 2025

Classic buffer overflow in Tenda CH22 Firmware 1.0.0.1 allows remote attackers to corrupt memory via an oversized page parameter. The fromwebExcptypemanFilter function writes that value with sprintf into a fixed 256-byte buffer without checking its length. No authentication or user interaction is required; the published proof of concept demonstrates the trigger, but not working code execution.

CVSS severity9.8
Critical
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Classic buffer overflow in Tenda CH22 Firmware 1.0.0.1 allows remote attackers to corrupt memory via an oversized page parameter. The fromwebExcptypemanFilter function writes that value with sprintf into a fixed 256-byte buffer without checking its length. No authentication or user interaction is required; the published proof of concept demonstrates the trigger, but not working code execution.

The record

CVE
CVE-2025-12273
Published
Oct 27, 2025
Updated
Oct 27, 2025
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
CH22 Firmware
Classifications
CWE-119, CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 27, 2025Record 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=1.0.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · CH22 Firmwareversion=1.0.0.1

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
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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
Privilegesunauthenticated
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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