CVE-2025-6121: A vulnerability, which was classified as critical, has been found in D-Link DIR-632 FW103B08

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CRITICAL 9.8REMOTEMITIGATE

CVE-2025-6121 is a critical-severity flaw (CVSS 9.8) affecting dir-632 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability, which was classified as critical, has been found in D-Link DIR-632 FW103B08. Affected by this issue is the function get_pure_content of the component HTTP POST Request Handler. The manipulation of the argument Content-Length leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported b

Why this priority

Critical severity
Public exploit reference
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	2.8% (top 14%)
CISA exploited list	No
Weakness	CWE-119, CWE-121
Published	2025-06-16
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: dlink

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

Am I affected?

Timeline

2025-06-16 12:15 UTCPublished CVE record published
2026-06-17 10:01 UTCUpdated Record last modified

dlink dir-632 firmware MITIGATE

Affected: 103b08

Fixed in: no fixed release known

Safe to downgrade to: a release before 103b08

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 ELN · fips-provider-next · FIXED · 1.5.3-3.eln159 · FEDORA-2026-3ce99ec7df · source

sudo dnf upgrade --advisory=FEDORA-2026-3ce99ec7df

Fedora 46 · rubygem-webmock · FIXED · 3.26.1-3.fc46 · FEDORA-2026-bb57b4d095 · source

sudo dnf upgrade --advisory=FEDORA-2026-bb57b4d095

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: github.com/xiaobor123/vul-finds/tree/main/vul-find-dir632-dlink-get_pure_content
Write-up: github.com/xiaobor123/vul-finds/tree/main/vul-find-dir632-dlink-get_pure_content#poc

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-2025-6121?

dir-632 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-6121 being exploited?

CVE-2025-6121 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-2025-6121 affect?

CVE-2025-6121 affects dir-632 firmware. Severity is critical (CVSS 9.8). A vulnerability, which was classified as critical, has been found in D-Link DIR-632 FW103B08. Affected by this issue is the function get_pure_content of the component HTTP POST Request Handler. The manipulation of the argument Content-Lengt

How urgent is CVE-2025-6121?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2025-5969 HIGH 8.8 MITIGATE A vulnerability has been found in D-Link DIR-632 FW103B08 and classified as critical
CVE-2025-5912 HIGH 8.8 MITIGATE A vulnerability was found in D-Link DIR-632 FW103B08

References

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