CVE-2017-7659
HighExploitedA maliciously constructed HTTP/2 request could cause mod_http2 in Apache HTTP Server 2.4.24, 2.4.25 to dereference a NULL pointer and crash the server process.
Published Jul 26, 2017 · Updated Sep 23, 2026 · Also known as ALPINE-CVE-2017-7659, DEBIAN-CVE-2017-7659, SUSE-SU-2018:0261-1
Key Facts
Patch immediately- CVE-2017-7659 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting HTTP Server (Apache), apache (arch), apache2 (alpine) and 22 more products.
- It is exploited in the wild, listed in Industry KEV feed since Feb 22, 2022. No public exploit code is known.
- EPSS estimates a 54% probability of exploitation in the next 30 days.
- Fixed versions are available, including apache 2.4.26-1, apache2 2.4.23-19.1, apache2 2.4.23-29.13.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.5
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
54%
Higher than 98.9% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
None known
Get the full CVE-2017-7659 brief as a PDF
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Description
A maliciously constructed HTTP/2 request could cause mod_http2 in Apache HTTP Server 2.4.24, 2.4.25 to dereference a NULL pointer and crash the server process.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Feb 22, 2022 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
106 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| HTTP ServerApache | 2.4.24, 2.4.25, >= 2.4.24, 2.4.25 | n/a |
| apachearch | See advisory | 2.4.26-1 |
| apache2alpine | See advisory | 2.4.26-r0 |
| rootio-apache2rootio | See advisory | 2.4.25-4 |
| httpd24-develamazon | See advisory | 2.4.27-3.71.amzn1 |
Patched Releases
apache
2.4.26-1
apache2
2.4.23-19.1, 2.4.23-29.13.1, 2.4.25-4, 2.4.26-r0
apache2-devel
2.4.23-19.1, 2.4.23-29.13.1
apache2-doc
2.4.23-19.1, 2.4.23-29.13.1
apache2-event
2.4.23-19.1
apache2-example-pages
2.4.23-19.1, 2.4.23-29.13.1
apache2-prefork
2.4.23-19.1, 2.4.23-29.13.1
apache2-utils
2.4.23-19.1, 2.4.23-29.13.1
apache2-worker
2.4.23-19.1, 2.4.23-29.13.1
httpd24
2.4.27-3.71.amzn1
httpd24-devel
2.4.27-3.71.amzn1
httpd24-httpd
0:2.4.25-9.el6.1, 0:2.4.25-9.el7.1, 2.4.25-9.0.1.el6.1
httpd24-httpd-devel
2.4.25-9.0.1.el6.1
httpd24-httpd-manual
2.4.25-9.0.1.el6.1
httpd24-httpd-tools
2.4.25-9.0.1.el6.1
httpd24-manual
2.4.27-3.71.amzn1
httpd24-mod_ldap
2.4.25-9.0.1.el6.1
httpd24-mod_proxy_html
1:2.4.25-9.0.1.el6.1
httpd24-mod_session
2.4.25-9.0.1.el6.1
httpd24-mod_ssl
1:2.4.25-9.0.1.el6.1
httpd24-tools
2.4.27-3.71.amzn1
mod24_ldap
2.4.27-3.71.amzn1
mod24_proxy_html
1:2.4.27-3.71.amzn1
mod24_session
2.4.27-3.71.amzn1
mod24_ssl
1:2.4.27-3.71.amzn1
Timeline
Publicly disclosed
Jul 26, 2017
Added to Industry KEV feed
Feb 22, 2022
Last updated
Sep 23, 2026
Weakness Type
- CWE-476 NULL Pointer Dereference
References
- advisoryRHSA-2017:2483
- advisoryhttps://bugzilla.suse.com/1042037
- advisoryhttps://bugzilla.suse.com/1045160
- advisoryhttps://bugzilla.suse.com/1048575
- advisoryhttps://bugzilla.suse.com/1057406
FAQ
Common Questions.
A maliciously constructed HTTP/2 request could cause mod_http2 in Apache HTTP Server 2.4.24, 2.4.25 to dereference a NULL pointer and crash the server process.
Affected: HTTP Server (Apache) versions 2.4.24, 2.4.25, >= 2.4.24, 2.4.25; apache (arch); apache2 (alpine), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Feb 22, 2022.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including apache 2.4.26-1, apache2 2.4.23-19.1, apache2 2.4.23-29.13.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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