CVE-2016-1546: apache http_server Resource Management Errors
Vulnerability summary
CVE-2016-1546 is a medium (CVSS 5.9) Resource Management Errors vulnerability in apache http_server. EPSS estimates a 15.92% chance of exploitation in the next 30 days, higher than 96.8% of scored vulnerabilities.
Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 1Timeline
- 06-07-2016PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
15.92%
Chance of exploitation in the next 30 days
Percentile
97%
Versus all other CVEs
30-day change
No change 0.00 pp
From 15.92% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Apache1 product
- http_server2.4.17 | 2.4.18
Debian1 product
- apache2< 2.4.20-1
2 vendors · 2 products
References
22 links- www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.htmlX Refsource CONFIRM
- www.apache.org/dist/httpd/CHANGES_2.4X Refsource CONFIRM
- svn.apache.org/viewvc?view=revision&revision=1733727X Refsource CONFIRM
- www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.htmlX Refsource CONFIRM
- security.netapp.com/advisory/ntap-20180601-0001/X Refsource CONFIRM
