CVE-2025-7206Public exploitNetwork attack vector

Web-service crash via persistent language overflow

Published Jul 8, 2025 · Updated Jul 9, 2025

Stack-based buffer overflow in D-Link DIR-825 2.10 allows remote attackers to crash httpd via an oversized language parameter. The switch_language.cgi handler stores the unvalidated value in NVRAM; later ASP rendering concatenates it beyond a fixed-size stack buffer in sub_40BFC4. No authentication or user interaction is required, and the demonstrated result is a segmentation fault that terminates the router's web service.

CVSS severityUnavailable
Unscored
EPSS probability18.39%
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-825 2.10 allows remote attackers to crash httpd via an oversized language parameter. The switch_language.cgi handler stores the unvalidated value in NVRAM; later ASP rendering concatenates it beyond a fixed-size stack buffer in sub_40BFC4. No authentication or user interaction is required, and the demonstrated result is a segmentation fault that terminates the router's web service.

The record

CVE
CVE-2025-7206
Published
Jul 8, 2025
Updated
Jul 9, 2025
Vendor
D-Link
Product
DIR-825
Classifications
CWE-121, CWE-119, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 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=2.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DIR-825version=2.10

Published CVSS scores

9.8VulDB CNACVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
9.8VulDB CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
10.0VulDB CNAAV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
9.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/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 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-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499Endpoint Denial of Service

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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