How severe is CVE-2024-10550?

CVE-2024-10550 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-2024-10550 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-10550?

CVE-2024-10550 affects H2o. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-10550?

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-2024-10550 have an EU (EUVD) identifier?

Yes. CVE-2024-10550 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-7113.

When was CVE-2024-10550 published?

CVE-2024-10550 was published on 2025-03-20 and last updated on 2026-06-17.

CVE-2024-10550

CVE-2024-10550 is a high-severity vulnerability in H2o 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-1333.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-7113
Weakness: CWE-1333
Affected product: H2o
Published: 2025-03-20
Last modified: 2026-06-17

Description

A vulnerability in the `/3/ParseSetup` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint applies a user-specified regular expression to a user-controllable string. This can be exploited by an attacker to cause inefficient regular expression complexity, leading to the exhaustion of server resources and making the server unresponsive.

Frequently asked questions

What is CVE-2024-10550?: A vulnerability in the `/3/ParseSetup` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint applies a user-specified regular expression to a user-controllable string. This can be exploited by an attacker to cause inefficient regular expression complexity, leading to the exhaustion of server resources and making the server unresponsive.
How severe is CVE-2024-10550?: CVE-2024-10550 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-2024-10550 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-10550?: CVE-2024-10550 affects H2o. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-10550?: 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-2024-10550 have an EU (EUVD) identifier?: Yes. CVE-2024-10550 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-7113.
When was CVE-2024-10550 published?: CVE-2024-10550 was published on 2025-03-20 and last updated on 2026-06-17.

References

https://huntr.com/bounties/ef3f4d89-3b8b-4618-b134-cb93c1664ec6

Affected products (1)

cpe:2.3:a:h2o:h2o:3.46.0.1:*:*:*:*:*:*:*

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