CVE-2025-55583: D-Link DIR-868L B1 router firmware version FW2.05WWB02 contains an unauthenticated OS command injection vulner

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CRITICAL 9.8REMOTEMITIGATE

CVE-2025-55583 is a critical-severity flaw (CVSS 9.8) affecting dir-868l firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

D-Link DIR-868L B1 router firmware version FW2.05WWB02 contains an unauthenticated OS command injection vulnerability in the fileaccess.cgi component. The endpoint /dws/api/UploadFile accepts a pre_api_arg parameter that is passed directly to system-level shell execution functions without sanitization or authentication. Remote attackers can exploit this to execute arbitrary commands as root via crafted HTTP requests.

Why this priority

Critical severity
EPSS top 6%: very likely to be exploited
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	7.0% (top 6%)
CISA exploited list	No
Weakness	CWE-78, CWE-306, CWE-668
Published	2025-08-28
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

2025-08-28 15:16 UTCPublished CVE record published
2026-06-17 09:41 UTCUpdated Record last modified

dlink dir-868l firmware MITIGATE

Affected: 2.05b02

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.05b02

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · R · FIXED · 4.6.2-1.fc46 · FEDORA-2026-1dd919a262 · source

sudo dnf upgrade --advisory=FEDORA-2026-1dd919a262

Fedora ELN · perl-Mail-AuthenticationResults · FIXED · 2.20261029-1.eln159 · FEDORA-2026-a2c11d7da6 · source

sudo dnf upgrade --advisory=FEDORA-2026-a2c11d7da6

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: cybermaya.in/posts/Post-44/

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-2025-55583?

dir-868l firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-55583 being exploited?

CVE-2025-55583 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-2025-55583 affect?

CVE-2025-55583 affects dir-868l firmware. Severity is critical (CVSS 9.8). D-Link DIR-868L B1 router firmware version FW2.05WWB02 contains an unauthenticated OS command injection vulnerability in the fileaccess.cgi component. The endpoint /dws/api/UploadFile accepts a pre_api_arg parameter that is passed directly

How urgent is CVE-2025-55583?

Priority 71/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2026-3485 CRITICAL 9.8 MITIGATE A flaw has been found in D-Link DIR-868L 110b03
CVE-2025-63932 HIGH 7.3 MITIGATE D-Link Router DIR-868L A1 FW106KRb01.bin has an unauthenticated remote code execution vulnerability in the cgi
CVE-2023-39668 CRITICAL 9.8 MITIGATE D-Link DIR-868L fw_revA_1-12_eu_multi_20170316 was discovered to contain a buffer overflow via the param_2 par
CVE-2023-39667 CRITICAL 9.8 MITIGATE D-Link DIR-868L fw_revA_1-12_eu_multi_20170316 was discovered to contain a buffer overflow via the param_2 par
CVE-2023-39665 CRITICAL 9.8 MITIGATE D-Link DIR-868L fw_revA_1-12_eu_multi_20170316 was discovered to contain a buffer overflow via the acStack_50

References

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