Vulnerability Details CVE-2025-55753
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 25.2%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2025-55753
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cpe:2.3:a:apache:http_server:2.4.30
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cpe:2.3:a:apache:http_server:2.4.31
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cpe:2.3:a:apache:http_server:2.4.32
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cpe:2.3:a:apache:http_server:2.4.33
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cpe:2.3:a:apache:http_server:2.4.34
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cpe:2.3:a:apache:http_server:2.4.35
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cpe:2.3:a:apache:http_server:2.4.36
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cpe:2.3:a:apache:http_server:2.4.37
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cpe:2.3:a:apache:http_server:2.4.38
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cpe:2.3:a:apache:http_server:2.4.39
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cpe:2.3:a:apache:http_server:2.4.40
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cpe:2.3:a:apache:http_server:2.4.41
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cpe:2.3:a:apache:http_server:2.4.42
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cpe:2.3:a:apache:http_server:2.4.43
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cpe:2.3:a:apache:http_server:2.4.44
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cpe:2.3:a:apache:http_server:2.4.45
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cpe:2.3:a:apache:http_server:2.4.46
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cpe:2.3:a:apache:http_server:2.4.47
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cpe:2.3:a:apache:http_server:2.4.48
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cpe:2.3:a:apache:http_server:2.4.49
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cpe:2.3:a:apache:http_server:2.4.50
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cpe:2.3:a:apache:http_server:2.4.51
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cpe:2.3:a:apache:http_server:2.4.52
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cpe:2.3:a:apache:http_server:2.4.53
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cpe:2.3:a:apache:http_server:2.4.54
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cpe:2.3:a:apache:http_server:2.4.55
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cpe:2.3:a:apache:http_server:2.4.56
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cpe:2.3:a:apache:http_server:2.4.57
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cpe:2.3:a:apache:http_server:2.4.58
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cpe:2.3:a:apache:http_server:2.4.59
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cpe:2.3:a:apache:http_server:2.4.60
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cpe:2.3:a:apache:http_server:2.4.61
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cpe:2.3:a:apache:http_server:2.4.62
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cpe:2.3:a:apache:http_server:2.4.63
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cpe:2.3:a:apache:http_server:2.4.64
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cpe:2.3:a:apache:http_server:2.4.65