Vulnerability in Apache HTTP Server
CVE-2020-11993
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.
Vulnerability class: HTTP Request Smuggling
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.564 (99.1th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.564 · newest: 0.564 · change: 0.000
Affected products
- Apache HTTP Server
- NetApp Clustered Data Ontap
- Oracle Communications Element Manager
- Oracle Communications Session Report Manager
- Oracle Communications Session Route Manager
- Oracle Enterprise Manager Ops Center — versions 12.4.0.0
- Oracle Hyperion Infrastructure Technology — versions 11.1.2.4
- Oracle Instantis Enterprisetrack — versions 17.1, 17.2, 17.3
- Oracle Zfs Storage Appliance Kit — versions 8.8
- Canonical Ubuntu Linux — versions 16.04, 18.04, 20.04
Weakness classification (CWE)
Public proof-of-concept exploits
References
- httpd.apache.org/security/vulnerabilities_24.html (Vendor Advisory)
- security.gentoo.org/glsa/202008-04 (vendor-advisory, Third Party Advisory)
- lists.apache.org/thread.html/r9e9f1a7609760f0f80562eaaec2aa3c32d525c3e0fca98b47… (mailing-list, Patch)
- lists.apache.org/thread.html/r5debe8f82728a00a4a68bc904dd6c35423bdfc8d601cfb457… (mailing-list, Patch)
- lists.apache.org/thread.html/r623de9b2b2433a87f3f3a15900419fc9c00c77b26936dfea4… (mailing-list, Patch)
- usn.ubuntu.com/4458-1/ (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-08/msg00068.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-08/msg00071.html (vendor-advisory, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-11993?
- CVE-2020-11993 is a high-severity vulnerability in Apache HTTP Server, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2020-08-07.
- How severe is CVE-2020-11993?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-11993 known to be exploited?
- 13 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.