How severe is CVE-2025-2259?

CVE-2025-2259 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-2259 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-2259?

CVE-2025-2259 affects Eclipse Threadx Netx Duo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-2259?

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-2025-2259 have an EU (EUVD) identifier?

Yes. CVE-2025-2259 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-10016.

When was CVE-2025-2259 published?

CVE-2025-2259 was published on 2025-04-06 and last updated on 2026-06-17.

CVE-2025-2259

CVE-2025-2259 is a high-severity vulnerability in Eclipse Threadx Netx Duo with a CVSS 3.x base score of 7.5. 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-191.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 5.3
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-10016
Weakness: CWE-191
Affected product: Eclipse Threadx Netx Duo
Published: 2025-04-06
Last modified: 2026-06-17

Description

In NetX HTTP server functionality of Eclipse ThreadX NetX Duo before version 6.4.3, an attacker can cause an integer underflow and a subsequent denial of service by writing a very large file, by specially crafted packets with Content-Length in one packet smaller than the data request size of the other packet. A possible workaround is to disable HTTP PUT support. This issue follows an incomplete fix of CVE-2025-0727

Frequently asked questions

What is CVE-2025-2259?: In NetX HTTP server functionality of Eclipse ThreadX NetX Duo before version 6.4.3, an attacker can cause an integer underflow and a subsequent denial of service by writing a very large file, by specially crafted packets with Content-Length in one packet smaller than the data request size of the other packet. A possible workaround is to disable HTTP PUT support. This issue follows an incomplete fix of CVE-2025-0727
How severe is CVE-2025-2259?: CVE-2025-2259 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-2259 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-2259?: CVE-2025-2259 affects Eclipse Threadx Netx Duo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-2259?: 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-2025-2259 have an EU (EUVD) identifier?: Yes. CVE-2025-2259 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-10016.
When was CVE-2025-2259 published?: CVE-2025-2259 was published on 2025-04-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:eclipse:threadx_netx_duo:*:*:*:*:*:*:*:*

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