Improper input validation in Apache HTTP Server

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 2.2.21, 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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published · last modified .

CVSS v2 metric

CVSS v2 base score 1.2 (Low). Vector: AV:L/AC:H/Au:N/C:N/I:N/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.030 (87.0th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2011-4415: held from 0.031 to 0.030.

EPSS over last 30 days · oldest: 0.031 · newest: 0.030 · change: -0.001

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2011-4415?
CVE-2011-4415 is a vulnerability in Apache HTTP Server, classified under Improper Input Validation. Published 2011-11-08.
Is CVE-2011-4415 known to be exploited?
24 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.