CVE-2016-0736
HIGH EXPLOITED RANSOMWAREApache HTTP Server <2.4.24 - Info Disclosure
Title source: llmExploitation Summary
CVE-2016-0736 has been observed exploited in the wild (reported by VulnCheck KEV), including in ransomware campaigns. EIP tracks 1 public exploit from researchers including RedTeam Pentesting GmbH.
AI-analyzed exploit summary This exploit demonstrates a Padding Oracle attack against Apache mod_session_crypto, allowing decryption of session data and encryption of arbitrary attacker-specified data. It includes a proof-of-concept using the python-paddingoracle library to exploit the vulnerability.
Description
In Apache HTTP Server versions 2.4.0 to 2.4.23, mod_session_crypto was encrypting its data/cookie using the configured ciphers with possibly either CBC or ECB modes of operation (AES256-CBC by default), hence no selectable or builtin authenticated encryption. This made it vulnerable to padding oracle attacks, particularly with CBC.
Exploits (1)
exploitdb
WORKING POC
by RedTeam Pentesting GmbH · pythonwebappsmultiple
https://www.exploit-db.com/exploits/40961
This exploit demonstrates a Padding Oracle attack against Apache mod_session_crypto, allowing decryption of session data and encryption of arbitrary attacker-specified data. It includes a proof-of-concept using the python-paddingoracle library to exploit the vulnerability.
Classification
Working Poc 95%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target:
Apache HTTP Server mod_session_crypto versions 2.3 to 2.5
No auth needed
Prerequisites:
Apache HTTP Server with mod_session_crypto enabled · Access to a session cookie
MITRE ATT&CK
devstral-2 · analyzed Feb 16, 2026
Full analysis →
References (27)
Core 27
Core References
Third Party Advisory vendor-advisory
x_refsource_debian
http://www.debian.org/security/2017/dsa-3796
Exploit, Third Party Advisory exploit
x_refsource_exploit-db
https://www.exploit-db.com/exploits/40961/
Third Party Advisory, VDB Entry vdb-entry
x_refsource_sectrack
http://www.securitytracker.com/id/1037508
Vendor Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2017:1413
Vendor Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2017:1161
Third Party Advisory x_refsource_confirm
https://www.tenable.com/security/tns-2017-04
Vendor Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2017:1414
Third Party Advisory x_refsource_confirm
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03725en_us
Third Party Advisory, VDB Entry vdb-entry
x_refsource_bid
http://www.securityfocus.com/bid/95078
Vendor Advisory vendor-advisory
x_refsource_redhat
http://rhn.redhat.com/errata/RHSA-2017-1415.html
Vendor Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2017:0906
Vendor Advisory x_refsource_confirm
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2016-0736
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/201701-36
Vendor Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20180423-0001/
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/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/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%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/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467%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/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%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/rb14daf9cc4e28d18cdc15d6a6ca74e565672fabf7ad89541071d008b%40%3Ccvs.httpd.apache.org%3E
Mailing List mailing-list
x_refsource_mlist
https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E
Vendor Advisory x_refsource_confirm
https://support.apple.com/HT208221
Scores
CVSS v3
7.5
EPSS
0.4902
EPSS Percentile
98.7%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Details
VulnCheck KEV
2023-02-14
Ransomware Use
Confirmed
CWE
CWE-310
Status
published
Products (18)
apache/http_server
2.4.0
apache/http_server
2.4.1
apache/http_server
2.4.2
apache/http_server
2.4.3
apache/http_server
2.4.6
apache/http_server
2.4.7
apache/http_server
2.4.8
apache/http_server
2.4.9
apache/http_server
2.4.10
apache/http_server
2.4.12
... and 8 more
Published
Jul 27, 2017
Tracked Since
Feb 18, 2026