CVE-2015-3183
LowThe chunked transfer coding implementation in the Apache HTTP Server before 2.4.14 does not properly parse chunk headers, which allows remote attackers to conduct HTTP request smuggling attacks via a crafted request, related to mishandling of large chunk-size values and invalid…
Published Jul 20, 2015 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2015-3183, DLA-284-1, DSA-3325-1, SUSE-SU-2015:1885-1, SUSE-SU-2015:1885-2, UBUNTU-CVE-2015-3183, USN-2686-1
Key Facts
Patch immediately- CVE-2015-3183 is a low-severity vulnerability (CVSS 3.7 v3.1) affecting HTTP Server (Apache), apache2 (debian), rootio-apache2 and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 73% probability of exploitation in the next 30 days.
- Fixed versions are available, including HTTP Server 2.2.31, apache-commons-collections-eap6 0:3.2.1-18.redhat_7.1.ep6.el6, apache-commons-collections-eap6 0:3.2.1-18.redhat_7.1.ep6.el7.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
3.7
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS (30-day exploit likelihood)
73%
Higher than 99.4% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2015-3183 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
The chunked transfer coding implementation in the Apache HTTP Server before 2.4.14 does not properly parse chunk headers, which allows remote attackers to conduct HTTP request smuggling attacks via a crafted request, related to mishandling of large chunk-size values and invalid chunk-extension characters in modules/http/http_filters.c.
Affected Products
163 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| HTTP ServerApache | See advisory | 2.2.31 |
| apache2debian | See advisory | 2.4.16-1 |
| rootio-apache2rootio | See advisory | 2.4.16-1 |
| httpd24-develamazon | See advisory | 2.4.16-1.62.amzn1 |
| httpd24amazon | See advisory | 2.4.16-1.62.amzn1 |
Patched Releases
HTTP Server
2.2.31
apache-commons-collections-eap6
0:3.2.1-18.redhat_7.1.ep6.el6, 0:3.2.1-18.redhat_7.1.ep6.el7
apache2
2.2.12-59.1, 2.2.16-6+squeeze15, 2.2.22-13+deb7u5, 2.4.10-10+deb8u1, 2.4.10-14.10.1, 2.4.16-1, 2.4.7-1ubuntu4.5
apache2-devel
2.2.12-59.1, 2.4.10-14.10.1
apache2-doc
2.2.12-59.1, 2.4.10-14.10.1
apache2-example-pages
2.2.12-59.1, 2.4.10-14.10.1
apache2-mod_auth_kerb
5.4-2.4.1
apache2-mod_fastcgi
2.4.7-3.4.1
apache2-mod_jk
1.2.40-2.6.1
apache2-mod_security2
2.8.0-3.4.1
apache2-prefork
2.2.12-59.1, 2.4.10-14.10.1
apache2-utils
2.2.12-59.1, 2.4.10-14.10.1
apache2-worker
2.2.12-59.1, 2.4.10-14.10.1
hornetq-native
0:2.3.25-4.SP11_redhat_1.ep6.el6, 0:2.3.25-4.SP11_redhat_1.ep6.el7
httpd
0:2.2.15-47.el6_7, 0:2.2.26-41.ep6.el5, 0:2.4.6-31.ael7b_1.1, 2.2.15-47.0.1.el6_7, 2.2.31-1.6.amzn1, 2.4.6-31.0.1.el7_1.1
httpd-devel
2.2.15-47.0.1.el6_7, 2.2.31-1.6.amzn1, 2.4.6-31.0.1.el7_1.1
httpd-manual
2.2.15-47.0.1.el6_7, 2.2.31-1.6.amzn1, 2.4.6-31.0.1.el7_1.1
httpd-tools
2.2.15-47.0.1.el6_7, 2.2.31-1.6.amzn1, 2.4.6-31.0.1.el7_1.1
httpd22
0:2.2.26-42.ep6.el7
httpd24
0:2.4.6-59.ep7.el6, 0:2.4.6-59.ep7.el7, 2.4.16-1.62.amzn1
httpd24-devel
2.4.16-1.62.amzn1
httpd24-httpd
0:2.4.12-4.el6.2, 0:2.4.12-6.el7.1, 2.4.12-6.0.1.el7.1
httpd24-httpd-devel
2.4.12-6.0.1.el7.1
httpd24-httpd-manual
2.4.12-6.0.1.el7.1
httpd24-httpd-tools
2.4.12-6.0.1.el7.1
Timeline
Publicly disclosed
Jul 20, 2015
Last updated
Aug 4, 2026
Weakness Type
- CWE-17
- CWE-20 Improper Input Validation
- CWE-172 Encoding Error
References
- advisoryhttp://httpd.apache.org/security/vulnerabilities_24.html
- advisoryhttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA10735
- advisoryopenSUSE-SU-2015:1684
- advisoryHPSBUX03512
- advisoryRHSA-2015:1666
FAQ
Common Questions.
The chunked transfer coding implementation in the Apache HTTP Server before 2.4.14 does not properly parse chunk headers, which allows remote attackers to conduct HTTP request smuggling attacks via a crafted request, related to mishandling of large chunk-size values and invalid chunk-extension characters in modules/ht…
Affected: HTTP Server (Apache); apache2 (debian); rootio-apache2, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including HTTP Server 2.2.31, apache-commons-collections-eap6 0:3.2.1-18.redhat_7.1.ep6.el6, apache-commons-collections-eap6 0:3.2.1-18.redhat_7.1.ep6.el7.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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