CVE-2026-16331Public exploitNetwork attack vector

Unauthenticated dangerous file upload via save_ajax.php

Published Jul 21, 2026 · Updated Jul 21, 2026

Unrestricted file upload in D-Link DNS-320 1.0.2 allows remote attackers to upload dangerous files through its web interface. The record identifies /web/function/save_ajax.php and a malicious handler argument but does not disclose the request fields or missing validation operation. No authentication or user interaction is required; the public proof of concept establishes file upload, but the record does not show code execution.

CVSS severity7.3
High
EPSS probability1.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in D-Link DNS-320 1.0.2 allows remote attackers to upload dangerous files through its web interface. The record identifies /web/function/save_ajax.php and a malicious handler argument but does not disclose the request fields or missing validation operation. No authentication or user interaction is required; the public proof of concept establishes file upload, but the record does not show code execution.

The record

CVE
CVE-2026-16331
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
D-Link
Product
DNS-320
Classifications
CWE-284, CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2026Record 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=1.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DNS-320version=1.0.2

Published CVSS scores

7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-434Unrestricted Upload of File with Dangerous Type
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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