CVE-2011-4415
Vulnerability Scoring
The risk associated with CVE-2011-4415 is minimal, making exploitation highly unlikely in real-world scenarios.
The risk associated with CVE-2011-4415 is minimal, making exploitation highly unlikely in real-world scenarios.
Status: Modified
Last updated: 🕜 21 Nov 2024, 01:32 UTC
Originally published on: 🕦 08 Nov 2011, 11:55 UTC
Time between publication and last update: 4761 days
CVSS Release: version 2
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.
The exploitability of CVE-2011-4415 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
CVE-2011-4415 requires high complexity, reducing its exploitability but still posing a risk.
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
Above is the CVSS Sub-score Breakdown for CVE-2011-4415, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
Below is the Impact Analysis for CVE-2011-4415, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
The EPSS score estimates the probability that this vulnerability will be exploited in the near future.
EPSS Score: 0.046% (probability of exploit)
EPSS Percentile: 20.05%
(lower percentile = lower relative risk)
This vulnerability is less risky than approximately 79.95% of others.
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