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Fencer Intel
high 7.8

CVE-2019-5436 in the critical feed json

A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl versions 7.19.4 through 7.64.1.

published 7y ago modified 26d ago also EUVD-2019-15026

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
49.7%
EPSS 49.7% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl versions 7.19.4 through 7.64.1.

Patch / fix

  • 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 7.64.0-4

debian advisories DEBIAN-CVE-2019-5436

  • curl Ubuntu 16.04 LTS 7.47.0-1ubuntu2.13
  • curl Ubuntu 18.04 LTS 7.58.0-2ubuntu3.7
  • curl Ubuntu Pro 14.04 LTS 7.35.0-1ubuntu2.20+esm2

ubuntu advisories UBUNTU-CVE-2019-5436

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

  • curl RHEL 8 7.61.1-12.el8
  • libcurl RHEL 8 7.61.1-12.el8
  • libcurl-minimal RHEL 8 7.61.1-12.el8
  • curl RHEL 7 7.29.0-57.el7
  • libcurl RHEL 7 7.29.0-57.el7
  • curl RHEL 7.7 EUS 7.29.0-54.el7_7.3
  • libcurl RHEL 7.7 EUS 7.29.0-54.el7_7.3

red hat advisories RHSA-2020:2505RHSA-2020:1792RHSA-2020:1020

  • curl SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 +1 more 7.60.0-4.6.1
  • curl SLE Module for Basesystem 15 SP1, SLE Module for Basesystem 15 7.60.0-3.20.1
  • curl SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for SAP 12 SP1 +9 more 7.37.0-37.40.1
  • curl SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 7.37.0-70.41.2
  • curl-openssl1 SLES 11-SECURITY 7.37.0-70.41.2

suse advisories SUSE-SU-2019:2009-1SUSE-SU-2019:1357-2SUSE-SU-2019:1363-1SUSE-SU-2019:1357-1SUSE-SU-2019:14064-1

  • curl openSUSE Tumbleweed 7.79.1-1.1
  • curl openSUSE Leap 15.1, openSUSE Leap 15.0 7.60.0-lp151.5.3.1
  • curl-mini openSUSE Leap 15.1, openSUSE Leap 15.0 7.60.0-lp151.5.3.1

opensuse advisories openSUSE-SU-2024:10582-1openSUSE-SU-2019:1508-1

  • curl Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 7.65.0-r0
  • curl Alpine 3.9 7.64.0-r2
  • gnurl Alpine 3.17, Alpine 3.16 7.65.0-r0

alpine advisories ALPINE-CVE-2019-5436

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

  • libcurl-compat Arch Linux 7.65.0-1
  • libcurl-gnutls Arch Linux 7.65.0-1
  • lib32-libcurl-gnutls Arch Linux 7.65.0-1
  • lib32-libcurl-compat Arch Linux 7.65.0-1
  • lib32-curl Arch Linux 7.65.0-1
  • curl Arch Linux 7.65.0-1

arch linux advisories AVG-959AVG-960AVG-961AVG-962AVG-963AVG-964

Is CVE-2019-5436 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.

Check with Fencer

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-2019-5436 updated cvss 7.0

curl: TFTP receive heap buffer overflow in tftp_receive_packet() function

  • Red Hat Enterprise Linux 6 curl, libcurl
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Core Services jbcs-httpd24-curl jbcs-httpd24-curl
    affected: no fix available
  • Red Hat Software Collections httpd24-curl, httpd24-libcurl
    affected: no fix available “Fix deferred”
  • Red Hat JBoss Core Services Apache HTTP Server 2.4.29 SP2
    fixed: vendor fix RHSA-2019:1543
  • Red Hat Ansible Tower 3.5 for RHEL 7 Server ansible-tower-35/ansible-tower 3.5.6-1
    fixed: vendor fix RHBA-2020:1539
  • Red Hat Ansible Tower 3.6 for RHEL 7 ansible-tower-36/ansible-tower 3.6.4-1
    fixed: vendor fix RHBA-2020:1540
  • Red Hat Enterprise Linux BaseOS (v. 8) curl 7.61.1-12.el8, libcurl 7.61.1-12.el8, libcurl-minimal 7.61.1-12.el8
    fixed: vendor fix RHSA-2020:1792
  • Red Hat Enterprise Linux Client (v. 7) curl 7.29.0-57.el7, libcurl 7.29.0-57.el7 Red Hat Enterprise Linux Client Optional (v. 7) libcurl-devel 7.29.0-57.el7, curl-debuginfo 7.29.0-57.el7 Red Hat Enterprise Linux ComputeNode (v. 7) curl 7.29.0-57.el7, libcurl 7.29.0-57.el7
    fixed: vendor fix RHSA-2020:1020
show 7 more
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) curl 7.29.0-54.el7_7.3, libcurl 7.29.0-54.el7_7.3
    fixed: vendor fix RHSA-2020:2505
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) libcurl-devel 7.29.0-57.el7, curl-debuginfo 7.29.0-57.el7
    fixed: vendor fix RHSA-2020:1020
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) libcurl-devel 7.29.0-54.el7_7.3, curl-debuginfo 7.29.0-54.el7_7.3
    fixed: vendor fix RHSA-2020:2505
  • Red Hat Enterprise Linux Server (v. 7) curl 7.29.0-57.el7, libcurl 7.29.0-57.el7
    fixed: vendor fix RHSA-2020:1020
  • Red Hat Enterprise Linux Server EUS (v. 7.7) curl 7.29.0-54.el7_7.3, libcurl 7.29.0-54.el7_7.3
    fixed: vendor fix RHSA-2020:2505
  • Red Hat Enterprise Linux Workstation (v. 7) curl 7.29.0-57.el7, libcurl 7.29.0-57.el7
    fixed: vendor fix RHSA-2020:1020
  • Red Hat .NET Core 1.0 on Red Hat Enterprise Linux rh-dotnetcore10-curl Red Hat .NET Core 1.1 on Red Hat Enterprise Linux rh-dotnetcore11-curl Red Hat .NET Core 2.1 on Red Hat Enterprise Linux rh-dotnet21-curl, rh-dotnet21-libcurl Red Hat .NET Core 2.2 on Red Hat Enterprise Linux rh-dotnet22-curl, rh-dotnet22-libcurl Red Hat Enterprise Linux 5 curl Red Hat JBoss Web Server 5 curl
    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 7.8

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
total
Assessed
6mo ago

Exploit prediction

49.74% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • curl.haxx.se https://curl.haxx.se/docs/CVE-2019-5436.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • 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
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.