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.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2017-9789 from the MITRE CVE dictionary dictionary and NIST NVD.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 6.5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | None |
| Availability Impact | High |
| Platform | Package | State |
|---|---|---|
| Red Hat Software Collections for Red Hat Enterprise Linux | httpd24-httpd | Not affected |
| Red Hat JBoss Web Server 3 | httpd | Not affected |
| Red Hat JBoss EWS 2 | httpd | Not affected |
| Red Hat JBoss EWS 1 | httpd | Not affected |
| Red Hat JBoss EAP 6 | httpd | Not affected |
| Red Hat JBoss EAP 5 | httpd | Not affected |
| Red Hat JBoss Core Services 1 | httpd | Not affected |
| Red Hat Enterprise Linux 7 | httpd | Not affected |
| Red Hat Enterprise Linux 6 | httpd | Not affected |
| Red Hat Enterprise Linux 5 | httpd | Not affected |
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