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Vulnerability details: VCID-ngsg-cz1q-z7f8
Vulnerability ID VCID-ngsg-cz1q-z7f8
Aliases CVE-2016-8740
Summary The HTTP/2 protocol implementation (mod_http2) had an incomplete handling of the LimitRequestFields directive. This allowed an attacker to inject unlimited request headers into the server, leading to eventual memory exhaustion.
Status Published
Exploitability 2.0
Weighted Severity 5.3
Risk 10.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-20 Improper Input Validation
CWE-770 Allocation of Resources Without Limits or Throttling
System Score Found at
cvssv3 5.9 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-8740.json
epss 0.56733 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.56733 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62582 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62582 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62582 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62627 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62627 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62627 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62627 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62627 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62627 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62627 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62627 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62627 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62627 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62627 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62627 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
epss 0.62627 https://api.first.org/data/v1/epss?cve=CVE-2016-8740
cvssv2 4.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
apache_httpd low https://httpd.apache.org/security/json/CVE-2016-8740.json
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-8740.json
https://api.first.org/data/v1/epss?cve=CVE-2016-8740
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8740
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1401528 https://bugzilla.redhat.com/show_bug.cgi?id=1401528
847124 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=847124
CVE-2016-8740 Exploit https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/linux/dos/40909.py
CVE-2016-8740 https://httpd.apache.org/security/json/CVE-2016-8740.json
RHSA-2017:1161 https://access.redhat.com/errata/RHSA-2017:1161
RHSA-2017:1413 https://access.redhat.com/errata/RHSA-2017:1413
RHSA-2017:1414 https://access.redhat.com/errata/RHSA-2017:1414
RHSA-2017:1415 https://access.redhat.com/errata/RHSA-2017:1415
Data source Exploit-DB
Date added Dec. 12, 2016
Description Apache 2.4.23 mod_http2 - Denial of Service
Ransomware campaign use Unknown
Source publication date Dec. 12, 2016
Exploit type dos
Platform linux
Source update date Dec. 14, 2016
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-8740.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Exploit Prediction Scoring System (EPSS)
Percentile 0.98032
EPSS Score 0.56733
Published At Aug. 3, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:29:02.025991+00:00 Apache HTTPD Importer Import https://httpd.apache.org/security/json/CVE-2016-8740.json 37.0.0