Vulnerability in Apache HTTP Server
CVE-2016-1546
The Apache HTTP Server 2.4.17 and 2.4.18, when mod_http2 is enabled, does not limit the number of simultaneous stream workers for a single HTTP/2 connection, which allows remote attackers to cause a denial of service (stream-processing outage) via modified flow-control windows.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.159 (96.8th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.159 · newest: 0.159 · change: 0.000
Affected products
- Apache HTTP Server — versions 2.4.17, 2.4.18
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.securityfocus.com/bid/92331 (vdb-entry)
- httpd.apache.org/security/vulnerabilities_24.html (Patch, Vendor Advisory)
- security.gentoo.org/glsa/201610-02 (vendor-advisory)
- access.redhat.com/errata/RHSA-2017:1161 (vendor-advisory)
- www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- www.apache.org/dist/httpd/CHANGES_2.4
- svn.apache.org/viewvc
- www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.html
- security.netapp.com/advisory/ntap-20180601-0001/
- lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd6… (mailing-list)
Frequently asked questions
- What is CVE-2016-1546?
- CVE-2016-1546 is a medium-severity vulnerability in Apache HTTP Server, classified under CWE-399. CVSS score: 5.9/10. Published 2016-07-06.
- How severe is CVE-2016-1546?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2016-1546 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.