How severe is CVE-2024-10549?

CVE-2024-10549 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-2024-10549 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-2024-10549?

CVE-2024-10549 affects H2o. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-10549?

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-2024-10549 have an EU (EUVD) identifier?

Yes. CVE-2024-10549 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-7097.

When was CVE-2024-10549 published?

CVE-2024-10549 was published on 2025-03-20 and last updated on 2026-06-17.

CVE-2024-10549

CVE-2024-10549 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-2025-7097
Weakness: CWE-1333
Affected product: H2o
Published: 2025-03-20
Last modified: 2026-06-17

Description

A vulnerability in the `/3/Parse` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint uses a user-specified string to construct a regular expression, which is then applied to another user-specified string. By sending multiple simultaneous requests, an attacker can exhaust all available threads, leading to a complete denial of service.

Frequently asked questions

What is CVE-2024-10549?: A vulnerability in the `/3/Parse` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint uses a user-specified string to construct a regular expression, which is then applied to another user-specified string. By sending multiple simultaneous requests, an attacker can exhaust all available threads, leading to a complete denial of service.
How severe is CVE-2024-10549?: CVE-2024-10549 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-2024-10549 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-2024-10549?: CVE-2024-10549 affects H2o. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-10549?: 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-2024-10549 have an EU (EUVD) identifier?: Yes. CVE-2024-10549 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-7097.
When was CVE-2024-10549 published?: CVE-2024-10549 was published on 2025-03-20 and last updated on 2026-06-17.

References

https://huntr.com/bounties/ce7bd2d6-fd38-440d-a91a-dd8f3fc06bc2

Affected products (1)

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

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