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CVE-2025-4340: A vulnerability classified as critical has been found in D-Link DIR-890L and DIR-806A1 up to 100CNb11/108B03

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MEDIUM 6.3UPGRADEUPGRADE

CVE-2025-4340 is a medium-severity flaw (CVSS 6.3) affecting dir-806 firmware, dir-890l firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • EPSS top 7%: very likely to be exploited
  • Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score6.3 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance5.3% (top 7%)
CISA exploited listNo
WeaknessCWE-74, CWE-77
Published2025-05-06
Last modified2026-06-17
Publisher (CNA): VulDB · Vendor: dlink

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

Am I affected?

Timeline

dlink dir-806 firmware UPGRADE
Affected: <= 100cnb11
Fixed in: newer than 100cnb11
Safe to downgrade to: no unaffected older release
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.
dlink dir-890l firmware UPGRADE
Affected: <= 1.08b03
Fixed in: newer than 1.08b03
Safe to downgrade to: no unaffected older release
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-2025-4340?

dir-806 firmware: upgrade to newer than 100cnb11; dir-890l firmware: upgrade to newer than 1.08b03. Exact commands for each OS are on this page.

Is CVE-2025-4340 being exploited?

CVE-2025-4340 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-2025-4340 affect?

CVE-2025-4340 affects dir-806 firmware, dir-890l firmware. Severity is medium (CVSS 6.3). 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 la

How urgent is CVE-2025-4340?

Priority 50/100. EPSS top 7%: very likely to be exploited; Public exploit reference

Software pages

D-Link vulnerabilities

References

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