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Fencer Vulns
medium 5.9

CVE-2022-43552 json

A use after free vulnerability exists in curl <7.87.0.

published 2023-02-09 3 y ago modified 2026-10-23 16 d ago also EUVD-2022-46549 , JLSEC-2026-401

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.

Patch / fix

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

debian advisories DEBIAN-CVE-2022-43552

  • curl Ubuntu 18.04 LTS 7.58.0-2ubuntu3.22
  • curl Ubuntu 20.04 LTS 7.68.0-1ubuntu2.15
  • curl Ubuntu 22.04 LTS 7.81.0-1ubuntu1.7
  • curl Ubuntu Pro 14.04 LTS 7.35.0-1ubuntu2.20+esm14
  • curl Ubuntu Pro 16.04 LTS 7.47.0-1ubuntu2.19+esm7

ubuntu advisories UBUNTU-CVE-2022-43552

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-2024:0428RHSA-2023:3354RHSA-2023:7743RHSA-2023:2963RHSA-2023:2478

  • curl SLES for SAP 12 SP4, SLES 12 SP4-LTSS, SLES 12 SP4-ESPOS +2 more 7.60.0-4.56.1
  • curl SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS +1 more 7.60.0-150000.51.1
  • curl SLE Real Time 15 SP3, SLE Micro 5.2, SLE Micro 5.1 +2 more 7.66.0-150200.4.45.1
  • curl SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 7.60.0-11.52.1
  • 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-2023:2228-1SUSE-SU-2023:2226-1SUSE-SU-2022:4633-1SUSE-SU-2022:4598-1SUSE-SU-2022:4597-1

  • curl openSUSE Tumbleweed 7.87.0-1.1

opensuse advisories openSUSE-SU-2024:12583-1

  • curl AlmaLinux 8 7.61.1-30.el8
  • libcurl AlmaLinux 8 7.61.1-30.el8
  • libcurl-minimal AlmaLinux 8 7.61.1-30.el8
  • curl AlmaLinux 9 7.76.1-23.el9
  • libcurl AlmaLinux 9 7.76.1-23.el9
  • curl-minimal AlmaLinux 9 7.76.1-23.el9
  • libcurl-minimal AlmaLinux 9 7.76.1-23.el9

almalinux advisories ALSA-2023:2963ALSA-2023:2478

  • 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-2022-43552

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

  • cmake CBL-Mariner 2.0 3.21.4-13
  • curl CBL-Mariner 2.0 7.86.0-3
  • mysql CBL-Mariner 2.0 8.0.33-1
  • rust CBL-Mariner 2.0 1.72.0-2
  • cmake Azure Linux 3.0 3.28.2-1
  • tensorflow Azure Linux 3.0 2.16.1-1

azure linux advisories AZL-13280AZL-13284AZL-13287AZL-13289AZL-34604AZL-37981

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-2022-43552 updated cvss 5.9

curl: Use-after-free triggered by an HTTP proxy deny response

  • Red Hat .NET Core 3.1 on Red Hat Enterprise Linux rh-dotnet31-curl, rh-dotnet31-libcurl Red Hat Enterprise Linux 6 curl, libcurl
    affected: workaround, no fix planned “Avoid using the SMB and TELNET protocols.”
  • Red Hat JBCS httpd 2.4.51.sp2
    fixed: vendor fix “Avoid using the SMB and TELNET protocols.” RHSA-2023:3355
  • Red Hat Enterprise Linux AppStream (v. 9) libcurl-devel 7.76.1-23.el9, curl-debuginfo 7.76.1-23.el9, curl-debugsource 7.76.1-23.el9, libcurl-debuginfo 7.76.1-23.el9, curl-minimal-debuginfo 7.76.1-23.el9, libcurl-minimal-debuginfo 7.76.1-23.el9
    fixed: vendor fix “Avoid using the SMB and TELNET protocols.” RHSA-2023:2478
  • Red Hat Enterprise Linux BaseOS (v. 8) curl 7.61.1-30.el8, libcurl 7.61.1-30.el8, libcurl-minimal 7.61.1-30.el8
    fixed: vendor fix “Avoid using the SMB and TELNET protocols.” RHSA-2023:2963
  • Red Hat Enterprise Linux BaseOS (v. 9) curl 7.76.1-23.el9, libcurl 7.76.1-23.el9, curl-minimal 7.76.1-23.el9, libcurl-minimal 7.76.1-23.el9
    fixed: vendor fix “Avoid using the SMB and TELNET protocols.” RHSA-2023:2478
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) curl 7.61.1-22.el8_6.12, libcurl 7.61.1-22.el8_6.12, libcurl-minimal 7.61.1-22.el8_6.12
    fixed: vendor fix “Avoid using the SMB and TELNET protocols.” RHSA-2024:0428
  • Red Hat Enterprise Linux Client (v. 7) curl 7.29.0-59.el7_9.2, libcurl 7.29.0-59.el7_9.2 Red Hat Enterprise Linux Client Optional (v. 7) libcurl-devel 7.29.0-59.el7_9.2, curl-debuginfo 7.29.0-59.el7_9.2 Red Hat Enterprise Linux ComputeNode Optional (v. 7) libcurl-devel 7.29.0-59.el7_9.2, curl-debuginfo 7.29.0-59.el7_9.2 Red Hat Enterprise Linux Server (v. 7) curl 7.29.0-59.el7_9.2, libcurl 7.29.0-59.el7_9.2 Red Hat Enterprise Linux Workstation (v. 7) curl 7.29.0-59.el7_9.2, libcurl 7.29.0-59.el7_9.2
    fixed: vendor fix “Avoid using the SMB and TELNET protocols.” RHSA-2023:7743
  • 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 “Avoid using the SMB and TELNET protocols.” RHSA-2023:3354
show 1 more
  • 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 cvss 5.9

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 SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

2.71% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • hackerone.com https://hackerone.com/reports/1764858 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia CURL_jll
<8.5.0+0
8.5.0+0
julia LibCURL_jll
<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

References

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.