🛡️ CVE-2025-55753 on Debian — apache2

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2025-55753 as tracked by Debian, for the package apache2. The fix is available in version 2.4.66-1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

Affected software

DEBIAN-CVE-2025-55753 is recorded against 1 package.

apache2 (fixed in 2.4.66-1)

Timeline and source

Published on 5 December 2025 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2025-55753 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Alpine BellSoft Base record Debian 13 (Root.io)Ubuntu

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2025-12-05

Updated 2026-08-20

Modified 2026-08-04

Fix URL N/A

Affected Packages

Software	From version	Fixed in
apache2	—	2.4.66-1

References

ADVISORY https://security-tracker.debian.org/tracker/CVE-2025-55753

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