How severe is CVE-2025-6121?

CVE-2025-6121 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-2025-6121 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-6121?

CVE-2025-6121 affects Dlink Dir-632 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-6121?

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.

Does CVE-2025-6121 have an EU (EUVD) identifier?

Yes. CVE-2025-6121 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18394.

When was CVE-2025-6121 published?

CVE-2025-6121 was published on 2025-06-16 and last updated on 2026-06-17.

CVE-2025-6121

CVE-2025-6121 is a critical-severity vulnerability in Dlink Dir-632 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-119.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
CVSS v4: 8.9
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-18394
Weakness: CWE-119
Affected product: Dlink Dir-632 Firmware
Published: 2025-06-16
Last modified: 2026-06-17

Description

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 by the maintainer.

Frequently asked questions

What is CVE-2025-6121?: 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 by the maintainer.
How severe is CVE-2025-6121?: CVE-2025-6121 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-2025-6121 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-6121?: CVE-2025-6121 affects Dlink Dir-632 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-6121?: 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.
Does CVE-2025-6121 have an EU (EUVD) identifier?: Yes. CVE-2025-6121 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18394.
When was CVE-2025-6121 published?: CVE-2025-6121 was published on 2025-06-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:dlink:dir-632_firmware:103b08:*:*:*:*:*:*:*

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