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Fencer Intel
medium 4.2

CVE-2019-0197 json

A vulnerability was found in Apache HTTP Server 2.4.34 to 2.4.38.

published 7y ago modified 4mo ago also EUVD-2019-0996

cvss
4.2
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.3%
EPSS 8.3% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

A vulnerability was found in Apache HTTP Server 2.4.34 to 2.4.38. 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. Server that never enabled the h2 protocol or that only enabled it for https: and did not set "H2Upgrade on" are unaffected by this issue.

Patch / fix

  • apache2 Debian 14, Debian 13, Debian 12 2.4.38-3

debian advisories DEBIAN-CVE-2019-0197

  • apache2 Ubuntu 18.04 LTS 2.4.29-1ubuntu4.10

ubuntu advisories UBUNTU-CVE-2019-0197

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • httpd RHEL 8 2.4.37-30.module+el8.3.0+7001+0766b9e7
  • mod_md RHEL 8 1:2.0.8-8.module+el8.3.0+6814+67d1e611
  • mod_ssl RHEL 8 1:2.4.37-30.module+el8.3.0+7001+0766b9e7
  • mod_ldap RHEL 8 2.4.37-30.module+el8.3.0+7001+0766b9e7
  • mod_http2 RHEL 8 1.15.7-2.module+el8.3.0+7670+8bf57d29
  • httpd-tools RHEL 8 2.4.37-30.module+el8.3.0+7001+0766b9e7
  • mod_session RHEL 8 2.4.37-30.module+el8.3.0+7001+0766b9e7
  • httpd-manual RHEL 8 2.4.37-30.module+el8.3.0+7001+0766b9e7

red hat advisories RHSA-2020:4751RHSA-2019:3932RHSA-2019:3933RHSA-2020:2644

  • apache2 SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +8 more 2.4.23-29.40.1
  • apache2 SLE Module for Server Applications 15 2.4.33-3.15.1

suse advisories SUSE-SU-2019:0878-1SUSE-SU-2019:0873-1

  • apache2 openSUSE Leap 15.0 2.4.33-lp150.2.17.1

opensuse advisories openSUSE-SU-2019:1209-1

  • mod_md AlmaLinux 8 1:2.0.8-8.module_el8.5.0+2609+b30d9eec
  • mod_md AlmaLinux 8 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa

almalinux advisories ALSA-2020:4751

  • mod_md Rocky Linux 8 1:2.0.8-8.module+el8.5.0+695+1fa8055e
  • mod_md Rocky Linux 8 1:2.0.8-8.module+el8.4.0+553+7a69454b

rocky linux advisories RLSA-2020:4751

  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +16 more 2.4.39-r0

alpine advisories ALPINE-CVE-2019-0197

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • apache Arch Linux 2.4.39-1

arch linux advisories AVG-946

Is CVE-2019-0197 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-0197 updated cvss 4.2

httpd: mod_http2: possible crash on late upgrade

  • Red Hat JBoss Enterprise Web Server 2 jbcs-httpd24, jbcs-httpd24-runtime
    affected: no fix planned “Out of support scope”
  • Red Hat Software Collections httpd24-httpd, httpd24-mod_md, httpd24-mod_ssl, httpd24-mod_ldap, httpd24-httpd-tools, httpd24-mod_session, +2 more
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 8) mod_md 2.0.8-8.module+el8.3.0+6814+67d1e611, httpd 2.4.37-30.module+el8.3.0+7001+0766b9e7, mod_ssl 2.4.37-30.module+el8.3.0+7001+0766b9e7, mod_http2 1.15.7-2.module+el8.3.0+7670+8bf57d29, mod_ldap 2.4.37-30.module+el8.3.0+7001+0766b9e7, httpd-tools 2.4.37-30.module+el8.3.0+7001+0766b9e7, +4 more
    fixed: vendor fix RHSA-2020:4751
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2019:3935
  • Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-apr 1.6.3-63.jbcs.el6, jbcs-httpd24-brotli 1.0.6-7.jbcs.el6, jbcs-httpd24-curl 7.64.1-14.jbcs.el6, jbcs-httpd24-curl 7.64.1-36.jbcs.el6, jbcs-httpd24-httpd 2.4.37-33.jbcs.el6, jbcs-httpd24-httpd 2.4.37-57.jbcs.el6, +43 more
    fixed: vendor fix RHSA-2019:3932
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-apr 1.6.3-63.jbcs.el7, jbcs-httpd24-brotli 1.0.6-7.jbcs.el7, jbcs-httpd24-curl 7.64.1-14.jbcs.el7, jbcs-httpd24-curl 7.64.1-36.jbcs.el7, jbcs-httpd24-httpd 2.4.37-33.jbcs.el7, jbcs-httpd24-httpd 2.4.37-57.jbcs.el7, +44 more
    fixed: vendor fix RHSA-2020:2644
  • Red Hat Enterprise Linux 5 httpd Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat Enterprise Linux 7 httpd, mod_ssl, mod_ldap, httpd-tools, mod_session, httpd-manual, +1 more Red Hat Virtualization 4 rhvm-appliance
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

8.29% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 4.2 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
NVD 2.0 4.9 AV:N/AC:M/Au:S/C:N/I:P/A:P

Affected products

  • Apache Software Foundation Apache HTTP Server

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.