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CVE-2025-53628

Yhirose Cpp-httplib denial of service

8.8 HIGHPublic exploitEPSS 0.49%
  1. Published10 Jul 2025

Description

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.20.1, cpp-httplib does not have a limit for a unique line, permitting an attacker to explore this to allocate memory arbitrarily. This vulnerability is fixed in 0.20.1. NOTE: This vulnerability is related to CVE-2025-53629.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Yhirose Cpp-httplib< 0.20.1

Remediation

Fixed in
Yhirose Cpp-httplib≥ 0.20.1

References

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Frequently asked

Is CVE-2025-53628 being actively exploited?

CVE-2025-53628 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.49%.

How severe is CVE-2025-53628?

CVE-2025-53628 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.49% probability of exploitation.

Which products are affected by CVE-2025-53628?

Affected products include Yhirose Cpp-httplib.

How do I fix CVE-2025-53628?

Upgrade affected software to a fixed version, for example Yhirose Cpp-httplib 0.20.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-53628 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.