CVE-2025-55753
Apache HTTP Server: mod_md (ACME), unintended retry intervals
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.
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:HConfidentialityHigh
I:NIntegrityNone
A:NAvailabilityNone
Weaknesses
Affected Products
Red Hat Inc.
commercial·USaka red hat
Apache Software Foundation
oss-project·USaka apache foundation
apache
oss-project·USaka apache httpd, apache http server
Сообщество свободного программного обеспечения
oss-projectaka fsf
ООО «РусБИТех-Астра»
commercial·RUaka rusbitech-astra
АО «ИВК»
commercial·RUaka ivk
and 6 more affected products View all →
Exploitability
Official Patch Available
Attack Graph
Products CVE Techniques Tactics
Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.
MITRE ATT&CK
1 technique Initial Access
References
https://httpd.apache.org/security/vulnerabilities_24.html
httpd.apache.org
http://www.openwall.com/lists/oss-security/2025/12/04/4
openwall.com
https://httpd.apache.org/security/vulnerabilities_24.html
httpd.apache.org
and 12 more references View all →
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