CVE-2015-1635KEV · OVERDUE

Microsoft HTTP.sys Remote Code Execution Vulnerability

Critical · published April 14, 2015

Patch now

Confirmed exploited, and the score agrees

CVSS calls it critical at 9.8. It is confirmed in active exploitation. It sits in the 100.0th percentile for exploit probability.

1535
days past CISA
deadline
CVSS v3.1
9.8
EPSS
100%
Percentile
100.0
In the wild
Confirmed
What it is

🚨 A crafted HTTP request is all it takes to turn your Windows server into an attacker's playground! 🔥 Think of HTTP.sys as a restaurant kitchen that blindly accepts any order without verifying what’s on the ticket — if someone slipped in a malicious request, the chef could whip up a dish that's more poison than pasta! An attacker can exploit this vulnerability to execute arbitrary code, potentially gaining full control of your system. This means they could access sensitive data, install malware, or even completely take over your server—absolutely devastating!

Put simply

Think of HTTP.sys as a restaurant kitchen that blindly accepts any order without verifying what’s on the ticket — if someone slipped in a malicious request, the chef could whip up a dish that's more poison than pasta! This vulnerability exists in HTTP.sys, allowing remote attackers to send specially crafted HTTP requests that can execute arbitrary code on affected versions of Microsoft Windows.

What to do

An attacker can exploit this vulnerability to execute arbitrary code, potentially gaining full control of your system. This means they could access sensitive data, install malware, or even completely take over your server—absolutely devastating! Immediately patch your systems to the latest available version that resolves this vulnerability. Limit access to the affected services and monitor for any unauthorized HTTP requests. Regularly review security guidelines to ensure robust defenses are in place. You've got this! With these steps, you can secure your system and keep it safe from attacks. 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.99999 · 100.0th percentile
Published
2015-04-14T20:00Z
KEV added
2022-02-10 · due 2022-08-10
EPSS history
Timeline
  • 10 FEB 00:00Z
    Added to CISA KEV — remediate by Aug 10
    kev
  • 14 APR 20:00Z
    HTTP.sys in Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8, Windows 8.1, and Windows Server 2012 Gold and R2 allows remote attackers to execute…
    cvelistv5