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Vulnerability details: VCID-auc4-5bkq-8ffa
Vulnerability ID VCID-auc4-5bkq-8ffa
Aliases CVE-2016-0736
Summary Prior to Apache HTTP release 2.4.25, mod_sessioncrypto 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. An authentication tag (SipHash MAC) is now added to prevent such attacks.
Status Published
Exploitability 2.0
Weighted Severity 4.9
Risk 9.8
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-287 Improper Authentication
System Score Found at
cvssv3 5.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-0736.json
epss 0.10249 https://api.first.org/data/v1/epss?cve=CVE-2016-0736
epss 0.10249 https://api.first.org/data/v1/epss?cve=CVE-2016-0736
epss 0.10249 https://api.first.org/data/v1/epss?cve=CVE-2016-0736
epss 0.1741 https://api.first.org/data/v1/epss?cve=CVE-2016-0736
epss 0.1741 https://api.first.org/data/v1/epss?cve=CVE-2016-0736
epss 0.1741 https://api.first.org/data/v1/epss?cve=CVE-2016-0736
epss 0.1741 https://api.first.org/data/v1/epss?cve=CVE-2016-0736
epss 0.1741 https://api.first.org/data/v1/epss?cve=CVE-2016-0736
epss 0.1741 https://api.first.org/data/v1/epss?cve=CVE-2016-0736
epss 0.1741 https://api.first.org/data/v1/epss?cve=CVE-2016-0736
epss 0.1741 https://api.first.org/data/v1/epss?cve=CVE-2016-0736
epss 0.1741 https://api.first.org/data/v1/epss?cve=CVE-2016-0736
epss 0.1741 https://api.first.org/data/v1/epss?cve=CVE-2016-0736
cvssv2 4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
apache_httpd low https://httpd.apache.org/security/json/CVE-2016-0736.json
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-0736.json
https://api.first.org/data/v1/epss?cve=CVE-2016-0736
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0736
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2161
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8743
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1406744 https://bugzilla.redhat.com/show_bug.cgi?id=1406744
CVE-2016-0736 Exploit https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/webapps/40961.py
CVE-2016-0736 https://httpd.apache.org/security/json/CVE-2016-0736.json
CVE-2016-0736 Exploit https://www.redteam-pentesting.de/advisories/rt-sa-2016-001.txt
RHSA-2017:0906 https://access.redhat.com/errata/RHSA-2017:0906
RHSA-2017:1161 https://access.redhat.com/errata/RHSA-2017:1161
RHSA-2017:1413 https://access.redhat.com/errata/RHSA-2017:1413
RHSA-2017:1414 https://access.redhat.com/errata/RHSA-2017:1414
RHSA-2017:1415 https://access.redhat.com/errata/RHSA-2017:1415
USN-3279-1 https://usn.ubuntu.com/3279-1/
Data source Exploit-DB
Date added Dec. 23, 2016
Description Apache mod_session_crypto - Padding Oracle
Ransomware campaign use Unknown
Source publication date Dec. 23, 2016
Exploit type webapps
Platform multiple
Source update date Dec. 23, 2016
Source URL https://www.redteam-pentesting.de/advisories/rt-sa-2016-001.txt
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-0736.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:H/Au:N/C:P/I:P/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Exploit Prediction Scoring System (EPSS)
Percentile 0.92886
EPSS Score 0.10249
Published At Aug. 1, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:29:00.984848+00:00 Apache HTTPD Importer Import https://httpd.apache.org/security/json/CVE-2016-0736.json 37.0.0