CVE-2025-55753
apache2 - security update
7.5
HIGH
CVSS 3.1
EPSS 0.05%
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.
How to fix CVE-2025-55753
To remediate CVE-2025-55753, upgrade the affected package to a fixed version below.
- —upgrade to 2.4.66-r0 or later
- —upgrade to 2.4.66 or later
- —upgrade to 2.4.66-1~deb11u1 or later
- —upgrade to 2.4.66-1~deb11u1 or later
Is CVE-2025-55753 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 2.4.66-r0
- >= 2.4.30, < 2.4.66
- from 0, < 2.4.66-1~deb11u1
- from 0, < 2.4.66-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |