Medium severity5.9OSV Advisory· Published Jul 6, 2016· Updated Jun 17, 2026
CVE-2016-1546
CVE-2016-1546
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
42.4.17, 2.4.18+ 3 more
- (no CPE)range: 2.4.17, 2.4.18
- cpe:2.3:a:apache:http_server:2.4.17:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.4.18:*:*:*:*:*:*:*
- (no CPE)range: 2.4.17, 2.4.18
Patches
Vulnerability mechanics
References
21- httpd.apache.org/security/vulnerabilities_24.htmlnvdPatchVendor Advisory
- svn.apache.org/viewvcnvd
- www.apache.org/dist/httpd/CHANGES_2.4nvd
- www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.htmlnvd
- www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.htmlnvd
- www.securityfocus.com/bid/92331nvd
- access.redhat.com/errata/RHSA-2017:1161nvd
- lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7500997beb65d6f%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rb14daf9cc4e28d18cdc15d6a6ca74e565672fabf7ad89541071d008b%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3Envd
- security.gentoo.org/glsa/201610-02nvd
- security.netapp.com/advisory/ntap-20180601-0001/nvd
News mentions
4- OpenAI's agent chained decade-old DoS attacks to crash web servers in secondsThe Register Security · Jun 4, 2026
- ‘HTTP/2 Bomb’ Exploit Knocks Web Servers Offline in SecondsSecurityWeek · Jun 3, 2026
- New HTTP/2 Bomb Vulnerability Allows Remote DoS on NGINX, Apache, IIS, Envoy & CloudflareThe Hacker News · Jun 3, 2026
- HTTP/2 Bomb — Remote DoS Exploit Hits nginx, Apache, IIS, Envoy, and Cloudflare PingoraCyber Security News · Jun 3, 2026