CVE-2025-7911Public exploitNetwork attack vector

Authenticated memory corruption via unbounded sprintf

Published Jul 20, 2025 · Updated Jul 21, 2025

Stack-based buffer overflow in D-Link DI-8100 1.0 allows remote authenticated users to corrupt jhttpd memory via crafted HTTP requests. The upnp_ctrl.asp handler passes oversized remove_ext_proto or remove_ext_port values to sprintf, which writes past a stack buffer. The published request uses an administrative session; public evidence demonstrates trigger code but not code execution.

CVSS severity9.8
Critical
EPSS probability1.43%
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 DI-8100 1.0 allows remote authenticated users to corrupt jhttpd memory via crafted HTTP requests. The upnp_ctrl.asp handler passes oversized remove_ext_proto or remove_ext_port values to sprintf, which writes past a stack buffer. The published request uses an administrative session; public evidence demonstrates trigger code but not code execution.

The record

CVE
CVE-2025-7911
Published
Jul 20, 2025
Updated
Jul 21, 2025
Vendor
D-Link
Product
DI-8100
Classifications
CWE-119, CWE-121, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2025Record 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=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

D-Link · DI-8100version=1.0

Published CVSS scores

9.0D-LinkAV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
8.8D-LinkCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
8.8D-LinkCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.7D-LinkCVSS: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 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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-121Stack-based 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

See the directory against your own environment.

Your stack

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