CVE-2017-3169

CRITICAL

Apache HTTP Server 2.2.x < 2.2.33 and 2.4.x < 2.4.26 - NULL Pointer Dereference in mod_ssl

Title source: llm

Exploitation Summary

EIP tracks 2 public exploits for CVE-2017-3169. PoCs published by vaishakhcv, winterwolf32.

AI-analyzed exploit summary This repository contains a functional Perl exploit for CVE-2017-3169, a NULL pointer dereference vulnerability in Apache httpd's mod_ssl. The exploit triggers a DoS by sending crafted requests to an HTTPS port, leveraging a third-party module to call ap_hook_process_connection during an HTTP request.

Description

In Apache httpd 2.2.x before 2.2.33 and 2.4.x before 2.4.26, mod_ssl may dereference a NULL pointer when third-party modules call ap_hook_process_connection() during an HTTP request to an HTTPS port.

Exploits (2)

github WORKING POC 1 stars

by vaishakhcv · perlpoc

https://github.com/vaishakhcv/CVE-exploits/tree/master/CVE-2017-3169

View Code ZIP pw:eip

This repository contains a functional Perl exploit for CVE-2017-3169, a NULL pointer dereference vulnerability in Apache httpd's mod_ssl. The exploit triggers a DoS by sending crafted requests to an HTTPS port, leveraging a third-party module to call ap_hook_process_connection during an HTTP request.

Classification

Working Poc 95%

Attack Type

Dos

Complexity

Moderate

Reliability

Reliable

Target: Apache httpd 2.2.x before 2.2.33 and 2.4.x before 2.4.26

No auth needed

Prerequisites: Apache httpd installation directory · Apache with mod_ssl enabled · Ability to restart Apache

MITRE ATT&CK

T1499 - Endpoint Denial of Service

devstral-2 · analyzed Feb 27, 2026 Full analysis →

github WORKING POC

by winterwolf32 · perlpoc

https://github.com/winterwolf32/CVE_Exploits-/tree/master/CVE-2017-3169

View Code ZIP pw:eip

The repository contains a functional Perl exploit for CVE-2017-3169, a NULL pointer dereference vulnerability in Apache httpd's mod_ssl. The exploit triggers a DoS by sending crafted requests to an HTTPS port, leveraging a third-party module to call ap_hook_process_connection during an HTTP request.

Classification

Working Poc 95%

Attack Type

Dos

Complexity

Moderate

Reliability

Reliable

Target: Apache httpd 2.2.x before 2.2.33 and 2.4.x before 2.4.26

No auth needed

Prerequisites: Apache installation directory · Apache with mod_ssl enabled · Custom module compilation via apxs

MITRE ATT&CK

T1499 - Endpoint Denial of Service

devstral-2 · analyzed Feb 27, 2026 Full analysis →

References (42)

Core 42

Core References

Vendor Advisory x_refsource_confirm

https://support.apple.com/HT208221

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2017:2479

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2017:2483

Vendor Advisory x_refsource_confirm

https://security.netapp.com/advisory/ntap-20180601-0002/

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/84bf7fcc5cad35d355f11839cbdd13cbc5ffc1d34675090bff0f96ae%40%3Cdev.httpd.apache.org%3E

Mitigation, Third Party Advisory x_refsource_confirm

https://www.nomachine.com/SU08O00185

Vendor Advisory x_refsource_confirm

https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03908en_us

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2017:3475

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2017:3195

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2017:3476

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2017:3477

Third Party Advisory vendor-advisory x_refsource_debian

http://www.debian.org/security/2017/dsa-3896

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2017:3194

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2017:3193

Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack

http://www.securitytracker.com/id/1038711

Various Sources x_refsource_misc

https://github.com/gottburgm/Exploits/tree/master/CVE-2017-3169

Third Party Advisory, VDB Entry vdb-entry x_refsource_bid

http://www.securityfocus.com/bid/99134

Third Party Advisory vendor-advisory x_refsource_gentoo

https://security.gentoo.org/glsa/201710-32

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2017:2478

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7500997beb65d6f%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/rfcf929bd33a6833e3f0c35eebdad70d5060665f9c4e17ea467c66770%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/r6521a7f62276340eabdb3339b2aa9a38c5f59d978497a1f794af53be%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/rd336919f655b7ff309385e34a143e41c503e133da80414485b3abcc9%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%40%3Ccvs.httpd.apache.org%3E

Mailing List mailing-list x_refsource_mlist

https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E

Vendor Advisory x_refsource_confirm

http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html

Third Party Advisory x_refsource_confirm

https://www.tenable.com/security/tns-2019-09

Scores

CVSS v3 9.8

EPSS 0.1995

EPSS Percentile 97.1%

Attack Vector NETWORK

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE

CWE-476

Status published

Products (36)

apache/http_server 2.2.0

apache/http_server 2.2.2

apache/http_server 2.2.3

apache/http_server 2.2.11

apache/http_server 2.2.12

apache/http_server 2.2.13

apache/http_server 2.2.14

apache/http_server 2.2.15

apache/http_server 2.2.16

apache/http_server 2.2.17

... and 26 more

Published Jun 20, 2017

Tracked Since Feb 18, 2026