Cryptographic flaw in Apache HTTP Server
Priority MEDIUM 64CWE-310Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Partial Red Hat: 15 fixed, 1 without a fix
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
EPSS 0.49024 98th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Partial Red Hat: 5 advisoriesRed Hat: 15 fixed, 1 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Apache | Apache HTTP Server | 2.4.0 to 2.4.23 | — | No fix listed | CNA |
- Apache HTTP Server VendorApache Affected 2.4.0 to 2.4.23 Fixed in — No fix listed CNA
CPE configurations NVD · 17
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apache:http_server:2.4.0:*:*:*:*:*:*:* | 2.4.0 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.1:*:*:*:*:*:*:* | 2.4.1 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.2:*:*:*:*:*:*:* | 2.4.2 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.3:*:*:*:*:*:*:* | 2.4.3 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.6:*:*:*:*:*:*:* | 2.4.6 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.7:*:*:*:*:*:*:* | 2.4.7 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.8:*:*:*:*:*:*:* | 2.4.8 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.9:*:*:*:*:*:*:* | 2.4.9 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.10:*:*:*:*:*:*:* | 2.4.10 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.12:*:*:*:*:*:*:* | 2.4.12 | Vulnerable | Apache |
- cpe:2.3:a:apache:http_server:2.4.0:*:*:*:*:*:*:* Versions 2.4.0 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.1:*:*:*:*:*:*:* Versions 2.4.1 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.2:*:*:*:*:*:*:* Versions 2.4.2 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.3:*:*:*:*:*:*:* Versions 2.4.3 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.6:*:*:*:*:*:*:* Versions 2.4.6 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.7:*:*:*:*:*:*:* Versions 2.4.7 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.8:*:*:*:*:*:*:* Versions 2.4.8 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.9:*:*:*:*:*:*:* Versions 2.4.9 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.10:*:*:*:*:*:*:* Versions 2.4.10 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.12:*:*:*:*:*:*:* Versions 2.4.12 Vulnerable ·Apache
Show 7 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apache:http_server:2.4.14:*:*:*:*:*:*:* | 2.4.14 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.16:*:*:*:*:*:*:* | 2.4.16 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.19:*:*:*:*:*:*:* | 2.4.19 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.20:*:*:*:*:*:*:* | 2.4.20 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.21:*:*:*:*:*:*:* | 2.4.21 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.22:*:*:*:*:*:*:* | 2.4.22 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.4.23:*:*:*:*:*:*:* | 2.4.23 | Vulnerable | Apache |
- cpe:2.3:a:apache:http_server:2.4.14:*:*:*:*:*:*:* Versions 2.4.14 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.16:*:*:*:*:*:*:* Versions 2.4.16 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.19:*:*:*:*:*:*:* Versions 2.4.19 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.20:*:*:*:*:*:*:* Versions 2.4.20 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.21:*:*:*:*:*:*:* Versions 2.4.21 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.22:*:*:*:*:*:*:* Versions 2.4.22 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.4.23:*:*:*:*:*:*:* Versions 2.4.23 Vulnerable ·Apache
Remediation
Red Hat 5 advisories
- RHSA-2017:1413 Released 2017-06-07 · Red Hat rating ImportantRed Hat JBoss Core Services Apache HTTP Server 2.4.23 Service Pack 1 for RHEL 7
- Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd-2.4.23-120.jbcs.el7, jbcs-httpd24-httpd-devel-2.4.23-120.jbcs.el7, jbcs-httpd24-httpd-libs-2.4.23-120.jbcs.el7 +13
- RHSA-2017:1414 Released 2017-06-07 · Red Hat rating ImportantRed Hat JBoss Core Services Apache HTTP Server 2.4.23 Service Pack 1 for RHEL 6
- Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-httpd-2.4.23-120.jbcs.el6, jbcs-httpd24-httpd-devel-2.4.23-120.jbcs.el6, jbcs-httpd24-httpd-libs-2.4.23-120.jbcs.el6 +13
- RHSA-2017:1415 Released 2017-06-07 · Red Hat rating ImportantRed Hat JBoss Core Services Apache HTTP Server 2.4.23 Service Pack 1
- Red Hat JBoss Core Services
Show 2 more Red Hat advisories
- RHSA-2017:1161 Released 2017-04-26 · Red Hat rating Moderatehttpd24-httpd security, bug fix, and enhancement update
- Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) httpd24-httpd-2.4.25-9.el6, httpd24-httpd-devel-2.4.25-9.el6, httpd24-httpd-manual-2.4.25-9.el6 +5
- Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) httpd24-httpd-2.4.25-9.el7, httpd24-httpd-devel-2.4.25-9.el7, httpd24-httpd-manual-2.4.25-9.el7 +5
- Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7) httpd24-httpd-2.4.25-9.el6, httpd24-httpd-devel-2.4.25-9.el6, httpd24-httpd-manual-2.4.25-9.el6 +5
- Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.3) httpd24-httpd-2.4.25-9.el7, httpd24-httpd-devel-2.4.25-9.el7, httpd24-httpd-manual-2.4.25-9.el7 +5
- Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) httpd24-httpd-2.4.25-9.el6, httpd24-httpd-devel-2.4.25-9.el6, httpd24-httpd-manual-2.4.25-9.el6 +5
- Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) httpd24-httpd-2.4.25-9.el7, httpd24-httpd-devel-2.4.25-9.el7, httpd24-httpd-manual-2.4.25-9.el7 +5
- RHSA-2017:0906 Released 2017-04-12 · Red Hat rating Moderatehttpd security and bug fix update
- Red Hat Enterprise Linux Client Optional (v. 7) httpd-2.4.6-45.el7_3.4, httpd-devel-2.4.6-45.el7_3.4, httpd-manual-2.4.6-45.el7_3.4 +5
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) httpd-2.4.6-45.el7_3.4, httpd-devel-2.4.6-45.el7_3.4, httpd-manual-2.4.6-45.el7_3.4 +5
- Red Hat Enterprise Linux Server (v. 7) httpd-2.4.6-45.el7_3.4, httpd-devel-2.4.6-45.el7_3.4, httpd-manual-2.4.6-45.el7_3.4 +2
- Red Hat Enterprise Linux Server Optional (v. 7) mod_ldap-2.4.6-45.el7_3.4, mod_proxy_html-1:2.4.6-45.el7_3.4, mod_session-2.4.6-45.el7_3.4
- Red Hat Enterprise Linux Workstation (v. 7) httpd-2.4.6-45.el7_3.4, httpd-devel-2.4.6-45.el7_3.4, httpd-manual-2.4.6-45.el7_3.4 +2
- Red Hat Enterprise Linux Workstation Optional (v. 7) mod_ldap-2.4.6-45.el7_3.4, mod_proxy_html-1:2.4.6-45.el7_3.4, mod_session-2.4.6-45.el7_3.4
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Apache HTTP Server — DSA-3796
3 records Highest priority Priority MEDIUM 3 MEDIUM
Other records, highest priority first
- TI-2016-01972 Improper input validation in Apache HTTP ServerPriority MEDIUM 52
- TI-2016-07200 Apache HTTP Server, in all releases prior to 2.2.32 and 2.4.25, was liberal in the…Priority MEDIUM 47
- Advisory ·
Apache HTTP Server — RHSA-2017:0906
3 records Highest priority Priority MEDIUM 3 MEDIUM
Other records, highest priority first
- TI-2016-01972 Improper input validation in Apache HTTP ServerPriority MEDIUM 52
- TI-2016-07200 Apache HTTP Server, in all releases prior to 2.2.32 and 2.4.25, was liberal in the…Priority MEDIUM 47
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat JBoss Web Server 3 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2017:0906 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2017:0906 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2017:0906 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2017:0906 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2017:0906 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2017:0906 |
| Red Hat JBoss Core Services | Fixed | RHSA-2017:1415 |
| Red Hat JBoss Core Services on RHEL 6 Server | Fixed | RHSA-2017:1414 |
| Red Hat JBoss Core Services on RHEL 7 Server | Fixed | RHSA-2017:1413 |
| Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2017:1161 |
| Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2017:1161 |
| Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7) | Fixed | RHSA-2017:1161 |
| Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.3) | Fixed | RHSA-2017:1161 |
| Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2017:1161 |
| Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2017:1161 |
Not affected: 7 products
- Red Hat Directory Server 8
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat JBoss Enterprise Application Platform 5
- Red Hat JBoss Enterprise Application Platform 6
- Red Hat JBoss Enterprise Web Server 1
- Red Hat JBoss Enterprise Web Server 2
Timeline
- 2026-10-02 Threatist record created from CVE-2016-0736
- 2026-10-03 Alias added: GHSA-mxm5-vg5c-rx7v
References
Exploit 1
Advisory 9
Other 15
- https://support.apple.com/HT208221
- https://www.tenable.com/security/tns-2017-04
- https://security.netapp.com/advisory/ntap-20180423-0001/
- [httpd-cvs] 20190815 svn commit: r1048743 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20190815 svn commit: r1048742 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20200401 svn commit: r1058586 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20200401 svn commit: r1058587 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/
- [httpd-cvs] 20210330 svn commit: r1073140 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20210330 svn commit: r1888194 [10/13] - /httpd/site/trunk/content/security/json/
- [httpd-cvs] 20210330 svn commit: r1073139 [10/13] - in /websites/staging/httpd/trunk/content: ./ security/json/
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/
- [httpd-cvs] 20210330 svn commit: r1073146 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities-httpd.xml security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20210330 svn commit: r1073149 [10/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/
- [httpd-cvs] 20210606 svn commit: r1075470 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
More Apache Http Server vulnerabilities
- TI-2021-18535 Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773) KEVCVSS 3.1CRITICAL 9.8
- TI-2021-18417 Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49 KEVCVSS 3.1CRITICAL 9.8
- TI-2024-25716 Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path. KEVCVSS 3.1CRITICAL 9.1
- TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0
- TI-2019-00184 Use after free in Apache HTTP Server KEVCVSS 3.1HIGH 7.8
- TI-2009-03392 The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2016-0736 · CVE Program
- CVE-2016-0736 · NVD
- FIRST EPSS
- GHSA-mxm5-vg5c-rx7v · GitHub Advisory Database · CC BY 4.0
- CVE-2016-0736 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences