CVE-2023-43238: D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter nvmacaddr in form2Dhcpip

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CRITICAL 9.8REMOTEMITIGATE

CVE-2023-43238 is a critical-severity flaw (CVSS 9.8) affecting dir-816 a2 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter nvmacaddr in form2Dhcpip.cgi.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-787, CWE-121
Published	2023-09-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dlink

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-09-21 13:15 UTCPublished CVE record published
2026-06-17 06:25 UTCUpdated Record last modified

dlink dir-816 a2 firmware MITIGATE

Affected: 1.10cnb05

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.10cnb05

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-43238?

dir-816 a2 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-43238 being exploited?

CVE-2023-43238 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-43238 affect?

CVE-2023-43238 affects dir-816 a2 firmware. Severity is critical (CVSS 9.8). D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter nvmacaddr in form2Dhcpip.cgi.

How urgent is CVE-2023-43238?

Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2025-44835 MEDIUM 6.3 MITIGATE D-Link DIR-816 A2V1.1.0B05 was found to contain a command injection in iptablesWebsFilterRun, which allows rem
CVE-2024-0921 MEDIUM 4.7 MITIGATE A vulnerability has been found in D-Link DIR-816 A2 1.10CNB04 and classified as critical
CVE-2023-43240 CRITICAL 9.8 MITIGATE D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter sip_address in ipportFil
CVE-2023-43239 CRITICAL 9.8 MITIGATE D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter flag_5G in showMACfilter
CVE-2023-43237 CRITICAL 9.8 MITIGATE D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter macCloneMac in setMAC.

References

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