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CVE Record

CVE-2011-4415: The ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2...

The ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, does not restrict the size of values of environment variables, which allows local users to cause a denial of service (memory consumption or NULL pointer dereference) via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, related to (1) the "len +=" statement and (2) the apr_pcalloc function call, a different vulnerability than CVE-2011-3607.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

CVE-2011-4415 is a denial-of-service issue in old Apache HTTP Server releases. If mod_setenvif is enabled and a local user can place crafted .htaccess rules, a matching HTTP request can force excessive memory use or a crash. It is not listed in KEV, and the provided sources do not show active exploitation. Exposure is most likely on legacy Apache 2.0 or 2.2 deployments with mod_setenvif enabled and .htaccess control delegated to local users, tenants, or application owners. Treat this as legacy-infrastructure hygiene with service-availability impact. It is not supported as actively exploited by the provided evidence, but exposed shared-hosting or multi-tenant Apache 2.0/2.2 systems deserve prompt review. Mitigation focus: Identify Apache 2.0.x and 2.2.x systems in scope.; Check vendor guidance for patched or supported replacement versions.; Disable or restrict .htaccess overrides where operationally feasible..

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Potential ATT&CK relevance

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0ADP providers
1Source links

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Affected products

Products and packages named in the record

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