How severe is CVE-2025-3266?

CVE-2025-3266 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-3266 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-3266?

CVE-2025-3266 affects Qinguoyi Tinywebserver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-3266?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-3266 have an EU (EUVD) identifier?

Yes. CVE-2025-3266 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-9906.

When was CVE-2025-3266 published?

CVE-2025-3266 was published on 2025-04-04 and last updated on 2026-06-17.

CVE-2025-3266

CVE-2025-3266 is a high-severity vulnerability in Qinguoyi Tinywebserver with a CVSS 3.x base score of 7.3. 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.3)
CVSS v2: 7.5
CVSS v4: 6.9
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-9906
Weakness: CWE-787
Affected product: Qinguoyi Tinywebserver
Published: 2025-04-04
Last modified: 2026-06-17

Description

A vulnerability, which was classified as critical, has been found in qinguoyi TinyWebServer up to 1.0. Affected by this issue is some unknown functionality of the file /http/http_conn.cpp. The manipulation of the argument name/password leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

Frequently asked questions

What is CVE-2025-3266?: A vulnerability, which was classified as critical, has been found in qinguoyi TinyWebServer up to 1.0. Affected by this issue is some unknown functionality of the file /http/http_conn.cpp. The manipulation of the argument name/password leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.
How severe is CVE-2025-3266?: CVE-2025-3266 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-3266 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-3266?: CVE-2025-3266 affects Qinguoyi Tinywebserver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-3266?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-3266 have an EU (EUVD) identifier?: Yes. CVE-2025-3266 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-9906.
When was CVE-2025-3266 published?: CVE-2025-3266 was published on 2025-04-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:qinguoyi:tinywebserver:1.0:*:*:*:*:*:*:*

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