high 7.5

CVE-2022-43551 in the critical feed json

A vulnerability exists in curl <7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP.

published 2022-12-23 3 y ago modified 2026-10-14 25 d ago also EUVD-2022-46548 , JLSEC-2026-400

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 16.6%; EPSS 16.6% chance of exploitation in 30 days, percentile 97%
public exploits: 0; none known

A vulnerability exists in curl <7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. However, the HSTS mechanism could be bypassed if the host name in the given URL first uses IDN characters that get replaced to ASCII counterparts as part of the IDN conversion. Like using the character UTF-8 U+3002 (IDEOGRAPHIC FULL STOP) instead of the common ASCII full stop (U+002E) `.`. Then in a subsequent request, it does not detect the HSTS state and makes a clear text transfer. Because it would store the info IDN encoded but look for it IDN decoded.

Patch / fix

fixed in 5 distros 7

julia CURL_jll 8.5.0+0
julia LibCURL_jll 7.87.0+0
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5

debian ubuntu red hat suse opensuse alpine azure linux

curl Debian 14, Debian 13, Debian 12 7.86.0-3

debian advisories DEBIAN-CVE-2022-43551

curl Ubuntu 22.04 LTS 7.81.0-1ubuntu1.7

ubuntu advisories UBUNTU-CVE-2022-43551

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

jbcs-httpd24-curl jboss core services 1 8.0.1-1.el7jbcs
jbcs-httpd24-curl jboss core services 1 8.0.1-1.el8jbcs
jbcs-httpd24-httpd jboss core services 1 2.4.51-39.el7jbcs
jbcs-httpd24-httpd jboss core services 1 2.4.51-39.el8jbcs
jbcs-httpd24-libcurl jboss core services 1 8.0.1-1.el7jbcs
jbcs-httpd24-libcurl jboss core services 1 8.0.1-1.el8jbcs
jbcs-httpd24-mod_ssl jboss core services 1 1:2.4.51-39.el7jbcs
jbcs-httpd24-mod_ssl jboss core services 1 1:2.4.51-39.el8jbcs

red hat advisories RHSA-2023:3354

curl SLE Module for Basesystem 15 SP4, SLE Micro 5.3, openSUSE Leap Micro 5.3 +1 more 7.79.1-150400.5.12.1

suse advisories SUSE-SU-2022:4597-1

curl openSUSE Tumbleweed 7.87.0-1.1

opensuse advisories openSUSE-SU-2024:12583-1

curl Alpine 3.14 7.79.1-r4
curl Alpine 3.15 7.80.0-r5
curl Alpine 3.16 7.83.1-r5
curl Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 7.87.0-r0

alpine advisories ALPINE-CVE-2022-43551

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

curl CBL-Mariner 2.0 7.86.0-2
cmake CBL-Mariner 2.0 3.21.4-3
cmake Azure Linux 3.0 3.21.4-10
tensorflow Azure Linux 3.0 2.16.1-1

azure linux advisories AZL-12107 AZL-12930 AZL-34616 AZL-38788

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2022-43551 updated 2026-11-05 cvss 7.5

curl: HSTS bypass via IDN

Red Hat Enterprise Linux 6 curl, libcurl Red Hat Enterprise Linux 7 curl, libcurl
affected: no fix planned “Out of support scope”
Red Hat JBCS httpd 2.4.51.sp2
fixed: vendor fix RHSA-2023:3355
Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-curl 8.0.1-1.el7jbcs, jbcs-httpd24-libcurl 8.0.1-1.el7jbcs Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-curl 8.0.1-1.el8jbcs, jbcs-httpd24-libcurl 8.0.1-1.el8jbcs
fixed: vendor fix RHSA-2023:3354
Red Hat .NET Core 3.1 on Red Hat Enterprise Linux rh-dotnet31-curl, rh-dotnet31-libcurl Red Hat Enterprise Linux 8 curl, libcurl, libcurl-minimal Red Hat Enterprise Linux 9 curl, libcurl, curl-minimal, libcurl-minimal Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd 2.4.51-39.el7jbcs, jbcs-httpd24-mod_md 2.4.0-20.el7jbcs, jbcs-httpd24-mod_ssl 2.4.51-39.el7jbcs, jbcs-httpd24-openssl 1.1.1k-14.el7jbcs, jbcs-httpd24-apr-util 1.6.1-101.el7jbcs, jbcs-httpd24-mod_ldap 2.4.51-39.el7jbcs, +21 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-httpd 2.4.51-39.el8jbcs, jbcs-httpd24-mod_md 2.4.0-20.el8jbcs, jbcs-httpd24-mod_ssl 2.4.51-39.el8jbcs, jbcs-httpd24-openssl 1.1.1k-14.el8jbcs, jbcs-httpd24-apr-util 1.6.1-101.el8jbcs, jbcs-httpd24-mod_ldap 2.4.51-39.el8jbcs, +21 more
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

cisa ICSA-23-348-10 updated 2025-08-12 cvss 7.5

Siemens SIMATIC S7-1500

Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-23-131-05 updated 2025-05-06 cvss 7.5

Siemens SINEC NMS Third-Party

Siemens SINEC NMS <V1.0.3.1
affected: fixed in V1.0.3.1 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 14 mo ago (2025-08-15)

Exploit prediction

16.60% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

hackerone.com https://hackerone.com/reports/1755083 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
julia	CURL_jll	<8.5.0+0	8.5.0+0
julia	LibCURL_jll	>=7.81.0+0, <7.87.0+0	7.87.0+0

Affected products

n/a https://github.com/curl/curl
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness

CWE-319 Cleartext Transmission of Sensitive Information

References

hackerone.com /reports/1755083
exploit, third-party-advisory, web
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/TVWZW5CNSJ7UYAF2BGSYAWAEXDJYUBHA/
vendor-advisory, mailing-list, third-party-advisory, web
security.netapp.com /advisory/ntap-20230427-0007/
third-party-advisory, web
security.gentoo.org /glsa/202310-12
third-party-advisory, web
cert-portal.siemens.com /productcert/html/ssa-892048.html
cert-portal.siemens.com /productcert/html/ssa-398330.html

Sources

Fencer Vulns 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.

Summary