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
EPSS: 0.101 (93.2th percentile) — read the EPSS interpretation.
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.
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
- security@apache.org (mailing-list, x_refsource_MLIST)
- security@apache.org (x_refsource_CONFIRM)
- security@apache.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_BID)
- security@apache.org (x_refsource_CONFIRM)
- security@apache.org (x_refsource_CONFIRM)
- security@apache.org (x_refsource_CONFIRM, Release Notes, Vendor Advisory)
- security@apache.org (vendor-advisory, x_refsource_GENTOO)
- security@apache.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_SECTRACK)
- security@apache.org (mailing-list, x_refsource_MLIST)
- security@apache.org (mailing-list, x_refsource_MLIST)
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.