Use After Free in Apache HTTP Server
CVE-2017-9789
When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26 would sometimes access memory after it has been freed, resulting in potentially erratic behaviour.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.096 (95.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.096 · newest: 0.096 · change: 0.000
Affected products
- Apache HTTP Server — versions 2.4.26
- Apache Software Foundation HTTP Server — versions 2.4.26
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lists.apache.org/thread.html/9d0098775bd83cf7c33ac5a077ef412c14ce939198921e639c… (mailing-list)
- support.apple.com/HT208221
- www.securityfocus.com/bid/99568 (VDB Entry, Third Party Advisory, vdb-entry)
- support.hpe.com/hpsc/doc/public/display
- security.netapp.com/advisory/ntap-20170911-0002/
- httpd.apache.org/security/vulnerabilities_24.html (Release Notes, Vendor Advisory)
- security.gentoo.org/glsa/201710-32 (vendor-advisory)
- www.securitytracker.com/id/1038907 (VDB Entry, Third Party Advisory, vdb-entry)
- lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd6… (mailing-list)
- lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209… (mailing-list)
Frequently asked questions
- What is CVE-2017-9789?
- CVE-2017-9789 is a high-severity vulnerability in Apache HTTP Server, classified under Use After Free. CVSS score: 7.5/10. Published 2017-07-13.
- How severe is CVE-2017-9789?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2017-9789 known to be exploited?
- 37 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.