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CVE

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.
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CVE

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.

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
C
H
U
-

Related Resources

No items found.

References

https://httpd.apache.org/security/vulnerabilities_24.html, http://www.openwall.com/lists/oss-security/2025/12/04/4

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.00113%
EPSS Percentile
0.30449%
Introduced Version
3fe4a02b4936b73a10009ac8ea2c742730ccbe42,0
Fix Available
e4a77ef6051b3fe22eafacbcf54855b178a0bddd,0:2.4.37-65.module+el8.10.0+23815+1b5e1c66.7,1:2.0.8-8.module+el8.10.0+23815+1b5e1c66.2,1:2.4.37-65.module+el8.10.0+23815+1b5e1c66.7,0:1.15.7-10.module+el8.10.0+23369+11a81384.4,1:2.4.26-1.el9_7.1,2.4.66-1~deb13u1,2.4.66-1~deb12u1,0:2.4.58-1ubuntu8.10,0:2.4.52-1ubuntu4.18,2.4.66-r0,0:2.4.37-65.0.1.module+el8.10.0+90740+3332f30e.7,0:1.15.7-10.module+el8.10.0+90652+bef864ba.4,1:2.0.8-8.module+el8.10.0+90740+3332f30e.2,1:2.4.37-65.0.1.module+el8.10.0+90740+3332f30e.7,0:2.4.66-1.amzn2.0.1,1:2.4.66-1.amzn2.0.1

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