Unrated severityNVD Advisory· Published Dec 5, 2025· Updated Dec 5, 2025
Apache HTTP Server: mod_md (ACME), unintended retry intervals
CVE-2025-55753
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
74>=2.4.30 <2.4.66+ 1 more
- (no CPE)range: >=2.4.30 <2.4.66
- (no CPE)range: 2.4.30
- osv-coords72 versionspkg:bitnami/apachepkg:rpm/almalinux/httpdpkg:rpm/almalinux/httpd-develpkg:rpm/almalinux/httpd-filesystempkg:rpm/almalinux/httpd-manualpkg:rpm/almalinux/httpd-toolspkg:rpm/almalinux/mod_http2pkg:rpm/almalinux/mod_ldappkg:rpm/almalinux/mod_mdpkg:rpm/almalinux/mod_proxy_htmlpkg:rpm/almalinux/mod_sessionpkg:rpm/almalinux/mod_sslpkg:rpm/opensuse/apache2-devel&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/apache2-devel&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/apache2&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/apache2&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/apache2&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/apache2-event&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/apache2-event&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/apache2-manual&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/apache2-manual&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/apache2-prefork&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/apache2-prefork&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/apache2-utils&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/apache2-utils&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/apache2-worker&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/apache2-worker&distro=openSUSE%20Leap%2016.0pkg:rpm/suse/apache2-devel&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP7pkg:rpm/suse/apache2-devel&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/apache2-devel&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2-devel&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/apache2-devel&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP7pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/apache2&distro=SUSE%20Manager%20Proxy%20LTS%204.3pkg:rpm/suse/apache2&distro=SUSE%20Manager%20Server%20LTS%204.3pkg:rpm/suse/apache2-event&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7pkg:rpm/suse/apache2-event&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2-event&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/apache2-manual&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2-manual&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/apache2-prefork&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/apache2-prefork&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/apache2-prefork&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2-prefork&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/apache2-prefork&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/apache2-tls13&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/apache2-tls13&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/apache2-utils&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP7pkg:rpm/suse/apache2-utils&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/apache2-utils&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2-utils&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/apache2-utils&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/apache2-worker&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP7pkg:rpm/suse/apache2-worker&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/apache2-worker&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2-worker&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/apache2-worker&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0
>= 2.4.30, < 2.4.66+ 71 more
- (no CPE)range: >= 2.4.30, < 2.4.66
- (no CPE)range: < 2.4.37-65.module_el8.10.0+4088+57f011c1.7
- (no CPE)range: < 2.4.37-65.module_el8.10.0+4088+57f011c1.7
- (no CPE)range: < 2.4.37-65.module_el8.10.0+4088+57f011c1.7
- (no CPE)range: < 2.4.37-65.module_el8.10.0+4088+57f011c1.7
- (no CPE)range: < 2.4.37-65.module_el8.10.0+4088+57f011c1.7
- (no CPE)range: < 1.15.7-10.module_el8.10.0+4044+ea5f78b1.4
- (no CPE)range: < 2.4.37-65.module_el8.10.0+4088+57f011c1.7
- (no CPE)range: < 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2
- (no CPE)range: < 1:2.4.37-65.module_el8.10.0+4088+57f011c1.7
- (no CPE)range: < 2.4.37-65.module_el8.10.0+4088+57f011c1.7
- (no CPE)range: < 1:2.4.37-65.module_el8.10.0+4088+57f011c1.7
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.66-1.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.62-150700.4.9.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.51-150400.6.52.1
- (no CPE)range: < 2.4.51-150400.6.52.1
- (no CPE)range: < 2.4.51-150400.6.52.1
- (no CPE)range: < 2.4.51-150400.6.52.1
- (no CPE)range: < 2.4.62-150700.4.9.1
- (no CPE)range: < 2.4.51-150400.6.52.1
- (no CPE)range: < 2.4.51-35.75.1
- (no CPE)range: < 2.4.51-150400.6.52.1
- (no CPE)range: < 2.4.51-150400.6.52.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.51-150400.6.52.1
- (no CPE)range: < 2.4.51-150400.6.52.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.51-35.75.1
- (no CPE)range: < 2.4.51-150400.6.52.1
- (no CPE)range: < 2.4.51-150400.6.52.1
- (no CPE)range: < 2.4.62-150700.4.9.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.62-150700.4.9.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.51-35.75.1
- (no CPE)range: < 2.4.51-35.75.1
- (no CPE)range: < 2.4.62-150700.4.9.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.62-150700.4.9.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
Patches
Vulnerability mechanics
References
1- httpd.apache.org/security/vulnerabilities_24.htmlmitrevendor-advisory
News mentions
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