VULNERABILITY INTELLIGENCE
CVE-2017-9798
CVSS score7.5 HIGH
EPSS probability95.00%
CISA KEVNot currently listed
Published2017-09-18
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Description
Apache httpd allows remote attackers to read secret data from process memory if the Limit directive can be set in a user's .htaccess file, or if httpd.conf has certain misconfigurations, aka Optionsbleed. This affects the Apache HTTP Server through 2.2.34 and 2.4.x through 2.4.27. The attacker sends an unauthenticated OPTIONS HTTP request when attempting to read secret data. This is a use-after-free issue and thus secret data is not always sent, and the specific data depends on many factors including configuration. Exploitation with .htaccess can be blocked with a patch to the ap_limit_section function in server/core.c.
Weakness classification
- CWE-416: Use After Free
Primary references
- security@apache.org — Mailing List, VDB Entry
- security@apache.org — Third Party Advisory
- security@apache.org — Patch, Third Party Advisory
- security@apache.org — Patch, Third Party Advisory
- security@apache.org — Patch, Third Party Advisory
- security@apache.org — Patch, Third Party Advisory
- security@apache.org — Third Party Advisory, VDB Entry
- security@apache.org — Third Party Advisory, VDB Entry
- security@apache.org — Third Party Advisory, VDB Entry
- security@apache.org — Third Party Advisory
- security@apache.org — Third Party Advisory
- security@apache.org — Third Party Advisory