Skip to content
Noroxi
NVD / CVE Program· CNA apache

CVE-2016-0736: 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…

HighCVSS 7.5 · v3.0—Proof of concept Fix available

Noroxi assessment

Priority: Plan (action score 45/100)

  • Public proof-of-concept code exists (Exploit-DB); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 49% (FIRST EPSS); higher than 98.9% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: apache2 (Debian:12) 2.4.25-1; apache2 (Debian:8) 2.4.10-10+deb8u8; httpd (Red Hat:enterprise_linux:7::client) 0:2.4.6-45.el7_3.4.

Add it to your regular patch cycle. Upgrade to apache2 (Debian:12) 2.4.25-1; apache2 (Debian:8) 2.4.10-10+deb8u8; httpd (Red Hat:enterprise_linux:7::client) 0:2.4.6-45.el7_3.4 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Jul 27, 2017
Updated
Jun 16, 2026
EPSS
49.0% · 98th percentile

Report tools

JSON

Action score

45

Plan

Add it to your regular patch cycle.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
15 / 30 · 49.0%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2016-0736

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Is Apache HTTP Server on your server exposed to the internet?Run a port scan

Your free account also gets you

  • CVE alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for apache records

Is Apache HTTP Server on your server exposed to the internet?Run a port scan

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
apachehttp server

Using http server? Add it to your stack and be the first to know about CVEs like this one. (Apache HTTP)

Watch new CVEs for http server

When you'll hear from us

  • when a new CVE affecting this product is published
  • when a record in your stack enters KEV or is weaponized

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Is Apache HTTP Server on your server exposed to the internet?Run a port scan

Your free account also gets you

  • CVE alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every Monday

Is Apache HTTP Server on your server exposed to the internet?

The free port scanner finds the open ports on your server and matches the service versions it can read against known vulnerabilities. No account needed.

Run a port scan

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

  • Apache Software Foundation Apache HTTP Server

    • 2.4.0 to 2.4.23affected
Affected versions · NVD (17)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apache http server2.4.0
  • apache http server2.4.1
  • apache http server2.4.10
  • apache http server2.4.12
  • apache http server2.4.14
  • apache http server2.4.16
  • apache http server2.4.19
  • apache http server2.4.2
  • apache http server2.4.20
  • apache http server2.4.21
  • apache http server2.4.22
  • apache http server2.4.23
  • apache http server2.4.3
  • apache http server2.4.6
  • apache http server2.4.7
  • apache http server2.4.8
  • apache http server2.4.9

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12apache2before 2.4.25-12.4.25-1
Debian:8apache2before 2.4.10-10+deb8u82.4.10-10+deb8u8
Red Hat:enterprise_linux:7::clienthttpdbefore 0:2.4.6-45.el7_3.40:2.4.6-45.el7_3.4
Red Hat:enterprise_linux:7::clienthttpd-debuginfobefore 0:2.4.6-45.el7_3.40:2.4.6-45.el7_3.4
Red Hat:enterprise_linux:7::clienthttpd-develbefore 0:2.4.6-45.el7_3.40:2.4.6-45.el7_3.4
Red Hat:enterprise_linux:7::clienthttpd-manualbefore 0:2.4.6-45.el7_3.40:2.4.6-45.el7_3.4
Red Hat:enterprise_linux:7::clienthttpd-toolsbefore 0:2.4.6-45.el7_3.40:2.4.6-45.el7_3.4
Red Hat:enterprise_linux:7::clientmod_ldapbefore 0:2.4.6-45.el7_3.40:2.4.6-45.el7_3.4
Red Hat:enterprise_linux:7::clientmod_proxy_htmlbefore 1:2.4.6-45.el7_3.41:2.4.6-45.el7_3.4
Red Hat:enterprise_linux:7::clientmod_sessionbefore 0:2.4.6-45.el7_3.40:2.4.6-45.el7_3.4
Red Hat:enterprise_linux:7::clientmod_sslbefore 1:2.4.6-45.el7_3.41:2.4.6-45.el7_3.4
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpdbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-debuginfobefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-develbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-libsbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-manualbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-selinuxbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-toolsbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-mod_ldapbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-mod_proxy_htmlbefore 1:2.4.23-120.jbcs.el61:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-mod_securitybefore 0:2.9.1-19.GA.jbcs.el60:2.9.1-19.GA.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-mod_security-debuginfobefore 0:2.9.1-19.GA.jbcs.el60:2.9.1-19.GA.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-mod_sessionbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-mod_sslbefore 1:2.4.23-120.jbcs.el61:2.4.23-120.jbcs.el6

+45

Same product

apache: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-42013Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)KEV
    99Now
  • CVE-2021-41773Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49KEV
    99Now
  • CVE-2024-38475Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.KEV
    96Now

Published before and after this one in the same product

  • ← EarlierCVE-2017-9789Jul 13, 2017 · When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26 would sometimes access memory after it has…
    33Monitor
  • ← EarlierCVE-2017-7659Jul 26, 2017 · A maliciously constructed HTTP/2 request could cause mod_http2 in Apache HTTP Server 2.4.24, 2.4.25 to dereference a NULL pointer and crash…
    46Plan
  • Later →CVE-2016-2161Jul 27, 2017 · In Apache HTTP Server versions 2.4.0 to 2.4.23, malicious input to mod_auth_digest can cause the server to crash, and each instance…
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:apache22.4.25-1 · Debian:12Package registry (OSV)
red hat:httpd0:2.4.6-45.el7_3.4 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:httpd-debuginfo0:2.4.6-45.el7_3.4 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:httpd-devel0:2.4.6-45.el7_3.4 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:httpd-manual0:2.4.6-45.el7_3.4 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:httpd-tools0:2.4.6-45.el7_3.4 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:httpd24-httpd0:2.4.25-9.el6 · Red Hat:rhel_software_collections:2::el6Package registry (OSV)
red hat:httpd24-httpd-debuginfo0:2.4.25-9.el6 · Red Hat:rhel_software_collections:2::el6Package registry (OSV)
red hat:httpd24-httpd-devel0:2.4.25-9.el6 · Red Hat:rhel_software_collections:2::el6Package registry (OSV)
red hat:mod_ldap0:2.4.6-45.el7_3.4 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:mod_proxy_html1:2.4.6-45.el7_3.4 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:mod_session0:2.4.6-45.el7_3.4 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:mod_ssl1:2.4.6-45.el7_3.4 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
suse:apache22.4.23-21.1 · SUSE:Linux Enterprise Server for Raspberry Pi 12 SP2Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrywebapps2016-12-23

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-217 d
  2. Published
  3. TodayNov 15, 2026+3397 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-310 · Cryptographic Issues

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records