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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.2.32, 2.4.24, 2.4.25 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | apache2 | 2.4.25-4 | — |
| Debian 13 | apache2 | 2.4.25-4 | — |
| Debian 12 | apache2 | 2.4.25-4 | — |
| Debian 9 | apache2 | 2.4.25-3+deb9u1 | DSA-3896-1 |
| Debian 8 | apache2 | 2.4.10-10+deb8u9 | DSA-3896-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | apache2 | 2.2.22-13+deb7u9 | DLA-1009-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | apache2 | 2.4.18-2ubuntu3.3 | USN-3340-1 |
| Ubuntu 14.04 LTS | apache2 | 2.4.7-1ubuntu4.16 | USN-3340-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | httpd +5 | 2.4.6-67.el7_4.2 | RHSA-2017:2479 |
| RHEL 7 | mod_ssl +1 | 1:2.4.6-67.el7_4.2 | RHSA-2017:2479 |
| RHEL 2 | httpd24-httpd +5 | 2.4.25-9.el6.1 | RHSA-2017:2483 |
| RHEL 2 | httpd24-mod_ssl +1 | 1:2.4.25-9.el6.1 | RHSA-2017:2483 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7.3 EUS | httpd +5 | 2.4.6-45.el7_3.5 | RHSA-2017:3194 |
| RHEL 7.3 EUS | mod_ssl +1 | 1:2.4.6-45.el7_3.5 | RHSA-2017:3194 |
| RHEL 7.2 EUS | httpd +5 | 2.4.6-40.el7_2.6 | RHSA-2017:3193 |
| RHEL 7.2 EUS | mod_ssl +1 | 1:2.4.6-40.el7_2.6 | RHSA-2017:3193 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | apache2 | 2.2.34-70.12.1 | SUSE-SU-2017:2907-1 |
| SLES 11 SP3 | apache2 | 2.2.34-70.12.1 | SUSE-SU-2017:2907-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Studio Onsite 1.3 | apache2 | 2.2.34-70.12.1 | SUSE-SU-2017:2907-1 |
| SLES for SAP 11 SP4 | apache2 | 2.2.34-70.12.1 | SUSE-SU-2017:2907-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | apache2 | 2.2.34-70.12.1 | SUSE-SU-2017:2907-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.26-r0 | — |
| Alpine v3.23 | apache2 | 2.4.26-r0 | — |
| Alpine v3.22 | apache2 | 2.4.26-r0 | — |
| Alpine v3.21 | apache2 | 2.4.26-r0 | — |
| Alpine v3.20 | apache2 | 2.4.26-r0 | — |
Show 17 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | apache2 | 2.4.26-r0 | — |
| Alpine v3.18 | apache2 | 2.4.26-r0 | — |
| Alpine v3.17 | apache2 | 2.4.26-r0 | — |
| Alpine v3.16 | apache2 | 2.4.26-r0 | — |
| Alpine v3.15 | apache2 | 2.4.26-r0 | — |
| Alpine v3.14 | apache2 | 2.4.26-r0 | — |
| Alpine v3.13 | apache2 | 2.4.26-r0 | — |
| Alpine v3.12 | apache2 | 2.4.26-r0 | — |
| Alpine v3.11 | apache2 | 2.4.26-r0 | — |
| Alpine v3.10 | apache2 | 2.4.26-r0 | — |
| Alpine v3.9 | apache2 | 2.4.26-r0 | — |
| Alpine v3.8 | apache2 | 2.4.26-r0 | — |
| Alpine v3.7 | apache2 | 2.4.26-r0 | — |
| Alpine v3.6 | apache2 | 2.4.26-r0 | — |
| Alpine v3.5 | apache2 | 2.4.26-r0 | — |
| Alpine v3.4 | apache2 | 2.4.26-r0 | — |
| Alpine v3.3 | apache2 | 2.4.26-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | httpd +5 | 2.4.6-67.0.1.el7_4.2 | ELSA-2017-2479 |
| Oracle Linux 7 | mod_ssl +1 | 1:2.4.6-67.0.1.el7_4.2 | ELSA-2017-2479 |
Advisories 10
- RHSA-2017:3194 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2017:3193 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2017:2483 Red Hat Security Advisory: httpd24-httpd security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2017:2479 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- USN-3340-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3896-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1009-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:2907-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0370 Apple Mac OS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 13, 2025
- ELSA-2017-2479 Important: httpd security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 15, 2017
References
- https://support.apple.com/HT208221
- RHSA-2017:2479 vendor-advisory
- [dev] 20170619 CVE-2017-7668: ap_find_token buffer overread mailing-list
- RHSA-2017:2483 vendor-advisory
- https://security.netapp.com/advisory/ntap-20180601-0002/
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03908en_us
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03821en_us
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- 99137 vdb-entry
- DSA-3896 vendor-advisory
- RHSA-2017:3194 vendor-advisory
- RHSA-2017:3193 vendor-advisory
- 1038711 vdb-entry
- GLSA-201710-32 vendor-advisory
- [httpd-cvs] 20190815 svn commit: r1048743 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20190815 svn commit: r1048742 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20190815 svn commit: r1048743 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20190815 svn commit: r1048742 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- https://www.tenable.com/security/tns-2019-09
- [httpd-cvs] 20200401 svn commit: r1058586 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20200401 svn commit: r1058586 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20200401 svn commit: r1058587 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20200401 svn commit: r1058587 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073140 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.ht mailing-list
- [httpd-cvs] 20210330 svn commit: r1073140 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.ht mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [11/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1888194 [11/13] - /httpd/site/trunk/content/security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073146 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities-httpd.xml security/vulnerabilities_22.html security/vulnerabilities_24.html mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [11/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073146 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities-httpd.xml security/vulnerabilities_22.html security/vulnerabilities_24.html mailing-list
- [httpd-cvs] 20210603 svn commit: r1075360 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabiliti mailing-list
- [httpd-cvs] 20210606 svn commit: r1075467 [2/2] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabiliti mailing-list
- [httpd-cvs] 20210606 svn commit: r1075470 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabiliti mailing-list