CVE-2017-9798
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...
- Published
- Sep 18, 2017
- Updated
- Nov 4, 2025
- Assigning CNA
- apache
- Evidence observed
- Sep 18, 2017
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NHigh · next 30 days
- Percentile
- 99.9%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
5- OptionsBleed-POC-ScannerScanner
OptionsBleed (CVE-2017-9798) PoC / Scanner
- optionsbleedScanner
Proof-of-concept scanner for the Optionsbleed vulnerability (CVE-2017-9798) that tests Apache HTTP servers for memory leak via HTTP OPTIONS method.
- CVE-2017-9798Scanner
Responsible use
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