How severe is CVE-2025-4340?

CVE-2025-4340 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-4340 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-4340?

CVE-2025-4340 primarily affects Dlink Dir-806 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-4340?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-4340 have an EU (EUVD) identifier?

Yes. CVE-2025-4340 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13558.

When was CVE-2025-4340 published?

CVE-2025-4340 was published on 2025-05-06 and last updated on 2026-06-17.

CVE-2025-4340

CVE-2025-4340 is a medium-severity vulnerability in Dlink Dir-806 Firmware with a CVSS 3.x base score of 6.3. 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-77.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
CVSS v2: 6.5
CVSS v4: 5.3
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-13558
Weakness: CWE-77
Affected product: Dlink Dir-806 Firmware
Published: 2025-05-06
Last modified: 2026-06-17

Description

A vulnerability classified as critical has been found in D-Link DIR-890L and DIR-806A1 up to 100CNb11/108B03. Affected is the function sub_175C8 of the file /htdocs/soap.cgi. The manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

Frequently asked questions

What is CVE-2025-4340?: A vulnerability classified as critical has been found in D-Link DIR-890L and DIR-806A1 up to 100CNb11/108B03. Affected is the function sub_175C8 of the file /htdocs/soap.cgi. The manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.
How severe is CVE-2025-4340?: CVE-2025-4340 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-4340 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-4340?: CVE-2025-4340 primarily affects Dlink Dir-806 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-4340?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-4340 have an EU (EUVD) identifier?: Yes. CVE-2025-4340 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13558.
When was CVE-2025-4340 published?: CVE-2025-4340 was published on 2025-05-06 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:dlink:dir-806_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-890l_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Dlink Dir-806 Firmware

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CVE-2019-10891 — Critical (CVSS 9.8): An issue was discovered in D-Link DIR-806 devices. There is a command injection in function hnap_main, which calls…

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