Vulnerability · Published Aug 7, 2020 · Assigned by apache
CVE-2020-11993
High 7.5
In plain English
A high-severity security flaw in Apache HTTP Server. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 56.6% (higher than 99.1% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)56.6%top 0.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on certain traffic edge patterns, logging statements were made on the wrong connection, causing concurrent use of memory pools. Configuring the LogLevel of mod_http2 above "info" will mitigate this vulnerability for unpatched servers.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | mod_http2 | 1.15.7-3.module_el8.5.0+2609+b30d9eec | ALSA-2021:1809 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.5.0+2609+b30d9eec | ALSA-2021:1809 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa | ALSA-2021:1809 |
| Alpine:v3.20 | apache2 | 2.4.46-r0 | ALPINE-CVE-2020-11993 |
| Alpine:v3.21 | apache2 | 2.4.46-r0 | ALPINE-CVE-2020-11993 |
| Alpine:v3.22 | apache2 | 2.4.46-r0 | ALPINE-CVE-2020-11993 |
| Alpine:v3.23 | apache2 | 2.4.46-r0 | ALPINE-CVE-2020-11993 |
| Alpine:v3.24 | apache2 | 2.4.46-r0 | ALPINE-CVE-2020-11993 |
| Debian:12 | apache2 | 2.4.46-1 | DEBIAN-CVE-2020-11993 |
| Debian:13 | apache2 | 2.4.46-1 | DEBIAN-CVE-2020-11993 |
| Debian:14 | apache2 | 2.4.46-1 | DEBIAN-CVE-2020-11993 |
| Rocky Linux:8 | httpd | 0:2.4.37-39.module+el8.4.0+571+fd70afb1 | RLSA-2021:1809 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-3.module+el8.5.0+695+1fa8055e | RLSA-2021:1809 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-3.module+el8.4.0+553+7a69454b | RLSA-2021:1809 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.4.0+553+7a69454b | RLSA-2021:1809 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.5.0+695+1fa8055e | RLSA-2021:1809 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | Apache HTTP Server | 2.4.20 to 2.4.43 |
References
- https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-11993 x_refsource_MISC
- GLSA-202008-04 vendor-advisory, x_refsource_GENTOO
- [httpd-dev] 20200808 Security announcements for CVE-2020-9490/CVE-2020-11993 ? mailing-list, x_refsource_MLIST
- [httpd-dev] 20200811 Which version fixed the CVE-2020-9490, CVE-2020-11984 and CVE-2020-11993 vulnerabilities? mailing-list, x_refsource_MLIST
- [httpd-dev] 20200811 Re: Which version fixed the CVE-2020-9490, CVE-2020-11984 and CVE-2020-11993 vulnerabilities? mailing-list, x_refsource_MLIST
- USN-4458-1 vendor-advisory, x_refsource_UBUNTU
- FEDORA-2020-8122a8daa2 vendor-advisory, x_refsource_FEDORA
- FEDORA-2020-b58dc5df38 vendor-advisory, x_refsource_FEDORA
- openSUSE-SU-2020:1285 vendor-advisory, x_refsource_SUSE
- openSUSE-SU-2020:1293 vendor-advisory, x_refsource_SUSE
- DSA-4757 vendor-advisory, x_refsource_DEBIAN
- https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20200814-0005/ x_refsource_CONFIRM
- openSUSE-SU-2020:1792 vendor-advisory, x_refsource_SUSE
- https://www.oracle.com/security-alerts/cpujan2021.html x_refsource_MISC
- http://packetstormsecurity.com/files/160393/Apache-2-HTTP2-Module-Concurrent-Pool-Usage.html x_refsource_MISC
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073143 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/ mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1888194 [13/13] - /httpd/site/trunk/content/security/json/ mailing-list, x_refsource_MLIST
- [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 mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073139 [13/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073149 [13/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073171 - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-11984.json security/json/CVE-2020-11993.json security/vulnerabilities_24.html mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1888228 - in /httpd/site/trunk/content/security/json: CVE-2020-11984.json CVE-2020-11993.json mailing-list, x_refsource_MLIST
- [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 mailing-list, x_refsource_MLIST