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Vulnerability details: VCID-4sss-a8ne-kqbc
Vulnerability ID VCID-4sss-a8ne-kqbc
Aliases CVE-2019-0197
Summary When HTTP/2 was enabled for a http: host or H2Upgrade was enabled for h2 on a https: host, an Upgrade request from http/1.1 to http/2 that was not the first request on a connection could lead to a misconfiguration and crash. A server that never enabled the h2 protocol or that only enabled it for https: and did not configure the "H2Upgrade on" is unaffected by this.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
System Score Found at
cvssv3 4.2 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-0197.json
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
epss 0.02193 https://api.first.org/data/v1/epss?cve=CVE-2019-0197
apache_httpd low https://httpd.apache.org/security/json/CVE-2019-0197.json
archlinux Critical https://security.archlinux.org/AVG-946
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-0197.json
https://api.first.org/data/v1/epss?cve=CVE-2019-0197
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-0197
1695042 https://bugzilla.redhat.com/show_bug.cgi?id=1695042
ASA-201904-3 https://security.archlinux.org/ASA-201904-3
AVG-946 https://security.archlinux.org/AVG-946
CVE-2019-0197 https://httpd.apache.org/security/json/CVE-2019-0197.json
RHSA-2019:3932 https://access.redhat.com/errata/RHSA-2019:3932
RHSA-2019:3933 https://access.redhat.com/errata/RHSA-2019:3933
RHSA-2019:3935 https://access.redhat.com/errata/RHSA-2019:3935
RHSA-2020:2644 https://access.redhat.com/errata/RHSA-2020:2644
RHSA-2020:2646 https://access.redhat.com/errata/RHSA-2020:2646
RHSA-2020:4751 https://access.redhat.com/errata/RHSA-2020:4751
USN-4113-1 https://usn.ubuntu.com/4113-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-0197.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
Exploit Prediction Scoring System (EPSS)
Percentile 0.84326
EPSS Score 0.02193
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:36:22.008978+00:00 Apache HTTPD Importer Import https://httpd.apache.org/security/json/CVE-2019-0197.json 38.0.0