Summary
It was discovered that the Apache HTTP Server incorrectly handled failed
ACME certificate renewals. This could result in renewal attempts to be
repeated without delays, possibly leading to a denial of service.
(CVE-2025-55753)
Anthony Parfenov discovered that the Apache HTTP Server would pass the
query string to cmd directives when configured with Server Side Includes
(SSI) enabled and mod_cgid. An attacker could possibly use this issue to
execute arbitrary code. (CVE-2025-58098)
Mattias Åsander discovered that the Apache HTTP Server incorrectly
neutralized certain environment variables. This could result in
unexpectedly superseding variables calculated by the server for CGI
programs. (CVE-2025-65082)
Mattias Åsander discovered that the Apache HTTP Server incorrectly
handled AllowOverride FileInfo configurations when using mod_userdir with
suexec. An attacker with access to use the RequestHeader directive in
htaccess can cause some CGI scripts to run under an unexpected userid.
(CVE-2025-66200)
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 22.04 LTS 22.04:LTS | apache2 | 2.4.52-1ubuntu4.18 |
| Ubuntu · 24.04 LTS 24.04:LTS | apache2 | 2.4.58-1ubuntu8.10 |
| Ubuntu · 25.10 | apache2 | 2.4.64-1ubuntu3.2 |
Vulnerabilities 4
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High 8.3CVE-2025-58098 Public exploit
Apache HTTP Server: Server Side Includes adds query string to #exec cmd=...
Apache HTTP Server 2.4.65 and earlier with Server Side Includes (SSI) enabled and mod_cgid (but not mod_cgi) passes the shell-escaped query string to #exec cmd="..." directives. This issue affects Apache HTTP Server before 2.4.66. Users are recommended to upg…
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High 7.5
Apache HTTP Server: mod_md (ACME), unintended retry intervals
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. T…
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Medium 6.5
Apache HTTP Server: CGI environment variable override
Improper Neutralization of Escape, Meta, or Control Sequences vulnerability in Apache HTTP Server through environment variables set via the Apache configuration unexpectedly superseding variables calculated by the server for CGI programs. This issue affects A…
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Medium 5.4
Apache HTTP Server: mod_userdir+suexec bypass via AllowOverride FileInfo
mod_userdir+suexec bypass via AllowOverride FileInfo vulnerability in Apache HTTP Server. Users with access to use the RequestHeader directive in htaccess can cause some CGI scripts to run under an unexpected userid. This issue affects Apache HTTP Server: fro…