CVE-2025-55753
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-05

Last updated on: 2025-12-10

Assigner: Apache Software Foundation

Description
An integer overflow in the case of failed ACME certificate renewal leads, after a number of failures (~30 days in default configurations), to the backoff timer becoming 0. Attempts to renew the certificate then are repeated without delays until it succeeds. This issue affects Apache HTTP Server: from 2.4.30 before 2.4.66. Users are recommended to upgrade to version 2.4.66, which fixes the issue.
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Meta Information
Published
2025-12-05
Last Modified
2025-12-10
Generated
2026-06-16
AI Q&A
2025-12-05
EPSS Evaluated
2026-06-15
NVD
CVE-2025-55753
EUVD
EUVD-2025-201395
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
apache http_server From 2.4.30 (inc) to 2.4.66 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-190 The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
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Executive Summary

This vulnerability is an integer overflow that occurs during failed ACME certificate renewals in Apache HTTP Server versions from 2.4.30 before 2.4.66. After about 30 days of repeated failures, the backoff timer resets to 0, causing the server to attempt certificate renewal repeatedly without any delay until it succeeds.

Impact Analysis

The impact of this vulnerability is that the server will continuously attempt to renew the certificate without any delay after repeated failures, which could lead to excessive resource consumption or potential denial of service conditions due to the rapid retry attempts.

Mitigation Strategies

Users are recommended to upgrade Apache HTTP Server to version 2.4.66, which fixes the issue.

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