CVE-2017-7668
HighExploitedThe HTTP strict parsing changes added in Apache httpd 2.2.32 and 2.4.24 introduced a bug in token list parsing, which allows ap_find_token() to search past the end of its input string.
Published Jun 20, 2017 · Updated Sep 23, 2026 · Also known as ALPINE-CVE-2017-7668, DEBIAN-CVE-2017-7668, UBUNTU-CVE-2017-7668
Key Facts
Patch immediately- CVE-2017-7668 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting HTTP Server (Apache), Clustered Data Ontap (Netapp), Oncommand Unified Manager (Netapp) 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 57% probability of exploitation in the next 30 days.
- Fixed versions are available, including apache 2.4.26-1, apache2 2.2.22-13+deb7u9, apache2 2.2.34-70.12.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
57%
Higher than 99.0% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
None known
Get the full CVE-2017-7668 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
The HTTP strict parsing changes added in Apache httpd 2.2.32 and 2.4.24 introduced a bug in token list parsing, which allows ap_find_token() to search past the end of its input string. By maliciously crafting a sequence of request headers, an attacker may be able to cause a segmentation fault, or to force ap_find_token() to return an incorrect value.
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
153 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| HTTP ServerApache | 2.2.32, 2.4.24, 2.4.25, >= 2.2.32 | n/a |
| Clustered Data OntapNetapp | See advisory | n/a |
| Oncommand Unified ManagerNetapp | See advisory | n/a |
| StoragegridNetapp | See advisory | n/a |
| Secure Global DesktopOracle | 5.3 | n/a |
Patched Releases
apache
2.4.26-1
apache2
2.2.22-13+deb7u9, 2.2.34-70.12.1, 2.4.10-10+deb8u9, 2.4.18-2ubuntu3.3, 2.4.25-3+deb9u1, 2.4.25-4, 2.4.26-r0, 2.4.7-1ubuntu4.16
apache2-devel
2.2.34-70.12.1
apache2-doc
2.2.34-70.12.1
apache2-example-pages
2.2.34-70.12.1
apache2-prefork
2.2.34-70.12.1
apache2-utils
2.2.34-70.12.1
apache2-worker
2.2.34-70.12.1
Mac OS X
10.13.1
httpd
0:2.4.6-45.el7_3.5, 2.4.6-67.0.1.el7_4.2
httpd-devel
2.4.6-67.0.1.el7_4.2
httpd-manual
2.4.6-67.0.1.el7_4.2
httpd-tools
2.4.6-67.0.1.el7_4.2
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
Timeline
Publicly disclosed
Jun 20, 2017
Added to Industry KEV feed
Feb 22, 2022
Last updated
Sep 23, 2026
Weakness Type
- CWE-122 Heap-based Buffer Overflow
- CWE-125 Out-of-bounds Read
- CWE-126 Buffer Over-read
References
- advisoryRHSA-2017:2479
- advisoryRHSA-2017:2483
- advisoryRHSA-2017:3193
- advisoryRHSA-2017:3194
- advisoryhttps://bugzilla.suse.com/1045060
FAQ
Common Questions.
The HTTP strict parsing changes added in Apache httpd 2.2.32 and 2.4.24 introduced a bug in token list parsing, which allows ap_find_token() to search past the end of its input string.
Affected: HTTP Server (Apache) versions 2.2.32, 2.4.24, 2.4.25, >= 2.2.32; Clustered Data Ontap (Netapp); Oncommand Unified Manager (Netapp), 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 2.2.22-13+deb7u9, apache2 2.2.34-70.12.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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