CVE-2025-7530Public exploitNetwork attack vector

Authenticated code execution via unchecked Username formatting

Published Jul 13, 2025 · Updated Jul 14, 2025

Stack-based buffer overflow in Tenda FH1202 1.2.0.14(408) allows remote authenticated users to execute code via a crafted Username value. The fromPptpUserAdd function passes the user-controlled username parameter to sprintf without a length check, overflowing stack buffer s_4. Access to the router's PPTP client configuration endpoint is required; exploitation can execute code or crash the device.

CVSS severity8.8
High
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Tenda FH1202 1.2.0.14(408) allows remote authenticated users to execute code via a crafted Username value. The fromPptpUserAdd function passes the user-controlled username parameter to sprintf without a length check, overflowing stack buffer s_4. Access to the router's PPTP client configuration endpoint is required; exploitation can execute code or crash the device.

The record

CVE
CVE-2025-7530
Published
Jul 13, 2025
Updated
Jul 14, 2025
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
FH1202
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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=1.2.0.14(408)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · FH1202version=1.2.0.14(408)

Published CVSS scores

8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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

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 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

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Your stack

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