How severe is CVE-2023-43238?

CVE-2023-43238 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-43238 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-43238?

CVE-2023-43238 affects Dlink Dir-816 A2 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-43238?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-43238 published?

CVE-2023-43238 was published on 2023-09-21 and last updated on 2026-06-17.

CVE-2023-43238

CVE-2023-43238 is a critical-severity vulnerability in Dlink Dir-816 A2 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Dlink Dir-816 A2 Firmware
Published: 2023-09-21
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2023-43238?: D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter nvmacaddr in form2Dhcpip.cgi.
How severe is CVE-2023-43238?: CVE-2023-43238 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-43238 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-43238?: CVE-2023-43238 affects Dlink Dir-816 A2 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-43238?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-43238 published?: CVE-2023-43238 was published on 2023-09-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:dlink:dir-816_a2_firmware:1.10cnb05:*:*:*:*:*:*:*

More vulnerabilities in Dlink Dir-816 A2 Firmware

CVE-2023-43240 — Critical (CVSS 9.8): D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter sip_address in ipportFilter.
CVE-2023-43239 — Critical (CVSS 9.8): D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter flag_5G in showMACfilterMAC.
CVE-2023-43237 — Critical (CVSS 9.8): D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter macCloneMac in setMAC.
CVE-2023-43236 — Critical (CVSS 9.8): D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter statuscheckpppoeuser in…
CVE-2018-17068 — Critical (CVSS 9.8): An issue was discovered on D-Link DIR-816 A2 1.10 B05 devices. An HTTP request parameter is used in command string…
CVE-2018-17067 — Critical (CVSS 9.8): An issue was discovered on D-Link DIR-816 A2 1.10 B05 devices. A very long password to /goform/formLogin could lead to…

All CVEs affecting Dlink Dir-816 A2 Firmware →

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