High severity7.5NVD Advisory· Published Dec 5, 2025· Updated Jun 17, 2026

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

Apache/HTTP Serverllm-fuzzy3 versions
from 2.4.30 before 2.4.66+ 2 more
- (no CPE)range: from 2.4.30 before 2.4.66
- cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*range: >=2.4.30,<2.4.66
- (no CPE)range: 2.4.30
osv-coords72 versions
pkg:rpm/suse/apache2-worker&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0 pkg:bitnami/apache pkg:rpm/suse/apache2-devel&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSS pkg:rpm/suse/apache2-prefork&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSS pkg:rpm/opensuse/apache2-prefork&distro=openSUSE%20Leap%2015.6 pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0 pkg:rpm/suse/apache2-devel&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0 pkg:rpm/suse/apache2-event&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0 pkg:rpm/suse/apache2-manual&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0 pkg:rpm/suse/apache2-prefork&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0 pkg:rpm/suse/apache2-utils&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0 pkg:rpm/opensuse/apache2-devel&distro=openSUSE%20Leap%2016.0 pkg:rpm/opensuse/apache2-event&distro=openSUSE%20Leap%2016.0 pkg:rpm/opensuse/apache2-manual&distro=openSUSE%20Leap%2016.0 pkg:rpm/opensuse/apache2-prefork&distro=openSUSE%20Leap%2016.0 pkg:rpm/opensuse/apache2-utils&distro=openSUSE%20Leap%2016.0 pkg:rpm/opensuse/apache2-worker&distro=openSUSE%20Leap%2016.0 pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2016.0 pkg:rpm/suse/apache2-devel&distro=SUSE%20Linux%20Enterprise%20Server%2016.0 pkg:rpm/suse/apache2-event&distro=SUSE%20Linux%20Enterprise%20Server%2016.0 pkg:rpm/suse/apache2-manual&distro=SUSE%20Linux%20Enterprise%20Server%2016.0 pkg:rpm/suse/apache2-prefork&distro=SUSE%20Linux%20Enterprise%20Server%2016.0 pkg:rpm/suse/apache2-utils&distro=SUSE%20Linux%20Enterprise%20Server%2016.0 pkg:rpm/suse/apache2-worker&distro=SUSE%20Linux%20Enterprise%20Server%2016.0 pkg:rpm/suse/apache2-tls13&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5 pkg:rpm/suse/apache2-tls13&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSS pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5 pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7 pkg:rpm/suse/apache2-prefork&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7 pkg:rpm/suse/apache2-utils&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP7 pkg:rpm/suse/apache2-worker&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP7 pkg:rpm/suse/apache2-event&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7 pkg:rpm/suse/apache2-devel&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP7 pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSS pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP7 pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOS pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSS pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOS pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSS pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSS pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSS pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4 pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5 pkg:rpm/suse/apache2&distro=SUSE%20Manager%20Proxy%20LTS%204.3 pkg:rpm/suse/apache2&distro=SUSE%20Manager%20Server%20LTS%204.3 pkg:rpm/opensuse/apache2&distro=openSUSE%20Leap%2016.0 pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSS pkg:rpm/opensuse/apache2-utils&distro=openSUSE%20Leap%2015.6 pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6 pkg:rpm/almalinux/httpd pkg:rpm/almalinux/httpd-devel pkg:rpm/almalinux/httpd-filesystem pkg:rpm/almalinux/httpd-manual pkg:rpm/almalinux/httpd-tools pkg:rpm/almalinux/mod_http2 pkg:rpm/almalinux/mod_ldap pkg:rpm/almalinux/mod_md pkg:rpm/almalinux/mod_proxy_html pkg:rpm/almalinux/mod_session pkg:rpm/almalinux/mod_ssl pkg:rpm/opensuse/apache2-event&distro=openSUSE%20Leap%2015.6 pkg:rpm/suse/apache2-utils&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSS pkg:rpm/suse/apache2-worker&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSS pkg:rpm/suse/apache2-devel&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6 pkg:rpm/suse/apache2-prefork&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6 pkg:rpm/suse/apache2-utils&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6 pkg:rpm/suse/apache2-worker&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6 pkg:rpm/opensuse/apache2&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/apache2-devel&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/apache2-worker&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/apache2&distro=openSUSE%20Tumbleweed pkg:rpm/opensuse/apache2-manual&distro=openSUSE%20Leap%2015.6
< 2.4.63-160000.3.1+ 71 more
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: >= 2.4.30, < 2.4.66
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.63-160000.3.1
- (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: < 2.4.63-160000.3.1
- (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: < 2.4.63-160000.3.1
- (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: < 2.4.63-160000.3.1
- (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: < 2.4.63-160000.3.1
- (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: < 2.4.51-35.75.1
- (no CPE)range: < 2.4.62-150700.4.9.1
- (no CPE)range: < 2.4.62-150700.4.9.1
- (no CPE)range: < 2.4.62-150700.4.9.1
- (no CPE)range: < 2.4.62-150700.4.9.1
- (no CPE)range: < 2.4.62-150700.4.9.1
- (no CPE)range: < 2.4.62-150700.4.9.1
- (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: < 2.4.51-150400.6.52.1
- (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: < 2.4.51-150400.6.52.1
- (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: < 2.4.51-150400.6.52.1
- (no CPE)range: < 2.4.63-160000.3.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (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: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.58-150600.5.41.1
- (no CPE)range: < 2.4.66-1.1
- (no CPE)range: < 2.4.58-150600.5.41.1

Patches

Vulnerability mechanics

References

www.openwall.com/lists/oss-security/2025/12/04/4nvdIssue TrackingThird Party Advisory
httpd.apache.org/security/vulnerabilities_24.htmlnvdVendor Advisory

News mentions

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cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000