CVE-2026-5215Public exploit

IPv6 topology disclosure via unauthenticated CGI handler

Published Mar 31, 2026 · Updated Mar 31, 2026

Improper access control in D-Link DNS and DNR appliances through 20260205 allows remote attackers to read IPv6 network configuration. The cgi_get_ipv6 handler in /cgi-bin/network_mgr.cgi returns link-local addresses, interface states, prefixes, gateways, and DNS settings without authentication. Access requires an adjacent network position and exposes internal IPv6 topology, with no reported integrity or availability impact.

CVSS severity4.3
Medium
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in D-Link DNS and DNR appliances through 20260205 allows remote attackers to read IPv6 network configuration. The cgi_get_ipv6 handler in /cgi-bin/network_mgr.cgi returns link-local addresses, interface states, prefixes, gateways, and DNS settings without authentication. Access requires an adjacent network position and exposes internal IPv6 topology, with no reported integrity or availability impact.

The record

CVE
CVE-2026-5215
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
D-Link
Product
DNR-322L
Classifications
CWE-284, CWE-266, T1016
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 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=20260205

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

D-Link · DNR-322Lversion=20260205
D-Link · DNS-1100-04version=20260205
D-Link · DNS-325version=20260205
D-Link · DNS-726-4version=20260205
D-Link · DNS-320Lversion=20260205
D-Link · DNR-202Lversion=20260205
D-Link · DNS-340Lversion=20260205
D-Link · DNS-321version=20260205
D-Link · DNS-1550-04version=20260205
D-Link · DNS-343version=20260205
D-Link · DNS-315Lversion=20260205
D-Link · DNS-323version=20260205
D-Link · DNS-345version=20260205
D-Link · DNR-326version=20260205
D-Link · DNS-327Lversion=20260205
D-Link · DNS-326version=20260205
D-Link · DNS-120version=20260205
D-Link · DNS-320version=20260205
D-Link · DNS-1200-05version=20260205
D-Link · DNS-320LWversion=20260205

Published CVSS scores

4.3VulDBCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
2.1VulDBCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
3.3VulDBAV:A/AC:L/Au:N/C:P/I:N/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-266Incorrect Privilege Assignment
T1016System Network Configuration Discovery

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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