CVE-2026-8344Public exploitNetwork attack vector

Authenticated command execution via stored DMZ address

Published May 11, 2026 · Updated May 11, 2026

Command injection in D-Link DIR-816 1.10CNB05_R1B011D88210 allows remote authenticated users to execute commands via DMZIPAddress. The formDMZ.cgi handler validates DMZIPAddress with inet_aton but stores the original string in NVRAM; sub_447C28 later inserts it into an iptables command passed to doSystem. Access to the router's DMZ configuration is required, and refreshing firewall or NAT rules executes the injected shell metacharacters on the device.

CVSS severity6.3
Medium
EPSS probability3.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in D-Link DIR-816 1.10CNB05_R1B011D88210 allows remote authenticated users to execute commands via DMZIPAddress. The formDMZ.cgi handler validates DMZIPAddress with inet_aton but stores the original string in NVRAM; sub_447C28 later inserts it into an iptables command passed to doSystem. Access to the router's DMZ configuration is required, and refreshing firewall or NAT rules executes the injected shell metacharacters on the device.

The record

CVE
CVE-2026-8344
Published
May 11, 2026
Updated
May 11, 2026
Vendor
D-Link
Product
DIR-816
Classifications
CWE-77, CWE-74, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 11, 2026CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=1.10CNB05_R1B011D88210

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

D-Link · DIR-816version=1.10CNB05_R1B011D88210

Published CVSS scores

6.3INCIBE-CERTCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
2.1INCIBE-CERTCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.5VulDB CNAAV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
6.3VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
6.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Command Injection
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1059.004Unix Shell

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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