Public exploit available
Public proof-of-concept or exploit code exists (ExploitDB / Metasploit / Nuclei).

CVE-2016-8740

CWE-20 — Improper Input ValidationCWE-399CWE-770 — Allocation without Limits12 documents9 sources
Severity
7.5HIGH
EPSS
68.3%
top 1.40%
CISA KEV
Not in KEV
Exploit
PoC available
Public exploit / PoC exists
Affected products
2
Apache Software Foundation Apache Http ServerApache Http Server
Timeline
PublishedDec 5
Latest updateMay 13

Description

The mod_http2 module in the Apache HTTP Server 2.4.17 through 2.4.23, when the Protocols configuration includes h2 or h2c, does not restrict request-header length, which allows remote attackers to cause a denial of service (memory consumption) via crafted CONTINUATION frames in an HTTP/2 request.

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages3 packages

▶NVDapache/http_server7 versions+6
▶Debianapache2< 2.4.25-1+3

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

3
GHSA
GHSA-pfj2-72r3-p693: The mod_http2 module in the Apache HTTP Server 2↗2022-05-13
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OSV
CVE-2016-8740: The mod_http2 module in the Apache HTTP Server 2↗2016-12-05
▶
CVEList
CVE-2016-8740: The mod_http2 module in the Apache HTTP Server 2↗2016-12-05
▶

💥Exploits & PoCs

1
Exploit-DB
Apache 2.4.23 mod_http2 - Denial of Service↗2016-12-12
▶

📋Vendor Advisories

5
Apple
CVE-2016-8740: macOS High Sierra 10.13.1, Security Update 2017-001 Sierra, and Security Update 2017-004 El Capitan↗2017-10-31
▶
Apple
CVE-2016-8740: macOS High Sierra 10.13↗2017-09-25
▶
Apple
CVE-2016-8740: macOS Sierra 10.12.4, Security Update 2017-001 El Capitan, and Security Update 2017-001 Yosemite↗2017-03-27
▶
Red Hat
httpd: Incomplete handling of LimitRequestFields directive in mod_http2↗2016-12-04
▶
Debian
CVE-2016-8740: apache2 - The mod_http2 module in the Apache HTTP Server 2.4.17 through 2.4.23, when the P...↗2016
▶

💬Community

2
Bugzilla
CVE-2016-8740 httpd: Incomplete handling of LimitRequestFields directive in mod_http2↗2016-12-05
▶
Bugzilla
CVE-2016-8740 httpd: Incomplete handling of LimitRequestFields directive in mod_http2 [fedora-all]↗2016-12-05
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CVE-2016-8740 (HIGH CVSS 7.5) | The mod_http2 module in the Apache | cvebase.io