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CVE-2025-55753

CVE-2025-55753 · Apache HTTP Server: mod_md (ACME), unintended retry intervals

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.5 · High · EPSS 0.4% · Fix available

Published
Updated

Stack: system · web

Affected products and versions

  • apache httpd

    Versions
    • ≥ 2.4.30, < 2.4.66: Affected (semver)

    Update to 2.4.66

  • apache2 Debian:12

    Versions
    • 2.4.57-2
    • 2.4.57-3
    • 2.4.58-1
    • 2.4.59-1
    • 2.4.59-1~deb10u1
    • 2.4.59-1~deb11u1
    • 2.4.59-1~deb12u1
    • 2.4.59-2
    • 2.4.60-1
    • 2.4.61-1
    • 2.4.61-1~deb11u1
    • 2.4.61-1~deb12u1
    • 2.4.62-1
    • 2.4.62-1~deb11u1
    • 2.4.62-1~deb11u2
    • 2.4.62-1~deb12u1
    • 2.4.62-1~deb12u2
    • 2.4.62-2
    • 2.4.62-3
    • 2.4.62-4
    • 2.4.62-5
    • 2.4.62-6
    • 2.4.63-1
    • 2.4.64-1
    • 2.4.65-1
    • 2.4.65-1~deb11u1
    • 2.4.65-1~deb12u1
    • 2.4.65-2
    • 2.4.65-3
    • 2.4.66-1~deb11u1
    Affected ranges
    • ECOSYSTEM: < 2.4.66-1~deb12u1

    Update to 2.4.66-1~deb12u1

  • apache2 Debian:13

    Versions
    • 2.4.65-2
    • 2.4.65-3
    • 2.4.66-1~deb11u1
    • 2.4.66-1~deb12u1
    • 2.4.66-1~deb12u2
    Affected ranges
    • ECOSYSTEM: < 2.4.66-1~deb13u1

    Update to 2.4.66-1~deb13u1

  • apache2 Debian:14

    Versions
    • 2.4.65-2
    • 2.4.65-3
    • 2.4.66-1~deb11u1
    • 2.4.66-1~deb12u1
    • 2.4.66-1~deb12u2
    • 2.4.66-1~deb13u1
    • 2.4.66-1~deb13u2
    Affected ranges
    • ECOSYSTEM: < 2.4.66-1

    Update to 2.4.66-1

  • apache2 Ubuntu:Pro:20.04:LTS

    Versions
    • 2.4.41-1ubuntu1
    • 2.4.41-4ubuntu1
    • 2.4.41-4ubuntu2
    • 2.4.41-4ubuntu3
    • 2.4.41-4ubuntu3.1
    • 2.4.41-4ubuntu3.3
    • 2.4.41-4ubuntu3.4
    • 2.4.41-4ubuntu3.5
    • 2.4.41-4ubuntu3.6
    • 2.4.41-4ubuntu3.7
    • 2.4.41-4ubuntu3.8
    • 2.4.41-4ubuntu3.9
    • 2.4.41-4ubuntu3.10
    • 2.4.41-4ubuntu3.11
    • 2.4.41-4ubuntu3.12
    • 2.4.41-4ubuntu3.13
    • 2.4.41-4ubuntu3.14
    • 2.4.41-4ubuntu3.15
    • 2.4.41-4ubuntu3.16
    • 2.4.41-4ubuntu3.17
    • 2.4.41-4ubuntu3.19
    • 2.4.41-4ubuntu3.20
    • 2.4.41-4ubuntu3.21
    • 2.4.41-4ubuntu3.23
    • 2.4.41-4ubuntu3.23+esm2
    Affected ranges
    • ECOSYSTEM: < 2.4.41-4ubuntu3.23+esm3

    Update to 2.4.41-4ubuntu3.23+esm3

  • apache2 Ubuntu:22.04:LTS

    Versions
    • 2.4.48-3.1ubuntu3
    • 2.4.48-3.1ubuntu4
    • 2.4.51-2ubuntu1
    • 2.4.52-1ubuntu1
    • 2.4.52-1ubuntu2
    • 2.4.52-1ubuntu4
    • 2.4.52-1ubuntu4.1
    • 2.4.52-1ubuntu4.2
    • 2.4.52-1ubuntu4.3
    • 2.4.52-1ubuntu4.4
    • 2.4.52-1ubuntu4.5
    • 2.4.52-1ubuntu4.6
    • 2.4.52-1ubuntu4.7
    • 2.4.52-1ubuntu4.8
    • 2.4.52-1ubuntu4.9
    • 2.4.52-1ubuntu4.10
    • 2.4.52-1ubuntu4.11
    • 2.4.52-1ubuntu4.12
    • 2.4.52-1ubuntu4.13
    • 2.4.52-1ubuntu4.14
    • 2.4.52-1ubuntu4.15
    • 2.4.52-1ubuntu4.16
    Affected ranges
    • ECOSYSTEM: < 2.4.52-1ubuntu4.18

    Update to 2.4.52-1ubuntu4.18

  • apache2 Ubuntu:24.04:LTS

    Versions
    • 2.4.57-2ubuntu2
    • 2.4.57-2ubuntu3
    • 2.4.58-1ubuntu1
    • 2.4.58-1ubuntu2
    • 2.4.58-1ubuntu6
    • 2.4.58-1ubuntu7
    • 2.4.58-1ubuntu8
    • 2.4.58-1ubuntu8.1
    • 2.4.58-1ubuntu8.2
    • 2.4.58-1ubuntu8.3
    • 2.4.58-1ubuntu8.4
    • 2.4.58-1ubuntu8.5
    • 2.4.58-1ubuntu8.6
    • 2.4.58-1ubuntu8.7
    • 2.4.58-1ubuntu8.8
    Affected ranges
    • ECOSYSTEM: < 2.4.58-1ubuntu8.10

    Update to 2.4.58-1ubuntu8.10

  • apache2 Ubuntu:25.10

    Versions
    • 2.4.63-1ubuntu1
    • 2.4.63-1ubuntu3
    • 2.4.64-1ubuntu2
    • 2.4.64-1ubuntu3
    Affected ranges
    • ECOSYSTEM: < 2.4.64-1ubuntu3.2

    Update to 2.4.64-1ubuntu3.2

  • apache2 Ubuntu:26.04:LTS

    Versions
    • 2.4.64-1ubuntu3
    • 2.4.65-3ubuntu1
    Affected ranges
    • ECOSYSTEM: < 2.4.66-2ubuntu1

    Update to 2.4.66-2ubuntu1

Original sources

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