CVE-2025-5912Public exploitNetwork attack vector

Memory corruption via unchecked filename concatenation

Published Jun 10, 2025 · Updated Jun 10, 2025

Stack-based buffer overflow in D-Link DIR-632 FW103B08 allows remote authenticated users to corrupt memory via a crafted HTTP POST request. The do_file function appends user-controlled request data with strcat to a 34-byte destination while constructing a web-root filename without bounds checking. Valid interface credentials are required, and the public proof of concept demonstrates the overflow trigger rather than reliable code execution.

CVSS severity8.8
High
EPSS probability1.38%
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 D-Link DIR-632 FW103B08 allows remote authenticated users to corrupt memory via a crafted HTTP POST request. The do_file function appends user-controlled request data with strcat to a 34-byte destination while constructing a web-root filename without bounds checking. Valid interface credentials are required, and the public proof of concept demonstrates the overflow trigger rather than reliable code execution.

The record

CVE
CVE-2025-5912
Published
Jun 10, 2025
Updated
Jun 10, 2025
Vendor
D-Link
Product
DIR-632
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 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=FW103B08

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

D-Link · DIR-632version=FW103B08

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
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

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-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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