No exploitation reportedFix available

CVE-2019-5436

Q: Is CVE-2019-5436 actively exploited?

Active exploitation of CVE-2019-5436 has not been confirmed. Its EPSS score was 49.7% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2019-5436?

CVE-2019-5436 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2019-05-28
WeaknessCWE-122 · CWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2019-05-2819:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-5436?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-5436?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Opensuse leap

Branch	Affected	Fixed in	Source
15.0	= 15.0	no fix published	NVD
15.1	= 15.1	no fix published	NVD
42.3	= 42.3	no fix published	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
9.0	= 9.0	no fix published	NVD
10.0	= 10.0	no fix published	NVD

Oracle enterprise manager ops center

Branch	Affected	Fixed in	Source
12.3	= 12.3.3	no fix published	NVD
12.4	= 12.4.0	no fix published	NVD

8 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As hackerone, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

curl
Affected
- = Fixed in 7.65.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of Use CVE recordupdated 2020-10-20

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

curlUbuntu:Pro:14.04:LTSall versions · fixed in 7.35.0-1ubuntu2.20+esm2
curlUbuntu:18.04:LTSall versions · fixed in 7.58.0-2ubuntu3.7
curlUbuntu:16.04:LTSall versions · fixed in 7.47.0-1ubuntu2.13
curlSUSE:OpenStack Cloud 7all versions · fixed in 7.37.0-37.40.1
curlSUSE:Linux Enterprise Software Development Kit 12 SP4all versions · fixed in 7.60.0-4.6.1
curlSUSE:Linux Enterprise Software Development Kit 12 SP3all versions · fixed in 7.37.0-37.40.1
curlSUSE:Linux Enterprise Server for SAP Applications 12 SP4all versions · fixed in 7.60.0-4.6.1
curlSUSE:Linux Enterprise Server for SAP Applications 12 SP3all versions · fixed in 7.37.0-37.40.1

50 more package ranges on OSV.dev

Vendor advisories

CVE-2019-5436 Red Hat Product Security138 products fixed · 9 known affected
curl: TFTP receive heap buffer overflow in tftp_receive_packet() function
curl as a component of Red Hat Enterprise Linux 6 · curl.src as a component of Red Hat Enterprise Linux 6 · libcurl as a component of Red Hat Enterprise Linux 6 · +6 more
ICSA-23-348-10 CISA5 known affected
Siemens SIMATIC S7-1500
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) · +2 more
SSA-398330 Siemens ProductCERT5 known affected
SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.0 < V3.1.5 · +2 more
RHSA-2020:2505 Red Hat Product Security36 products fixed
Red Hat Security Advisory: curl security update
RHSA-2020:1792 Red Hat Product Security45 products fixed
Red Hat Security Advisory: curl security update
RHBA-2020:1539 Red Hat Product Security1 product fixed
Red Hat Bug Fix Advisory: Red Hat Ansible Tower 3.5.6-1 - RHEL7 Container

3 more advisories

Full record on NVD

Fix

Vendor fix CISA ICSA-23-348-10 · 5 productsUpdate to V3.1.5 or later version
Vendor fix Siemens ProductCERT SSA-398330 · 1 productUpdate to V3.1.5 or later version
Vendor fix Red Hat Product Security RHSA-2020:2505 · 36 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Vendor fix Red Hat Product Security RHBA-2020:1539 · 1 productFor information on upgrading Ansible Tower, reference the Ansible Tower Upgrade and Migration Guide: https://docs.ansible.com/ansible-tower/latest/html/upgrade-migration-guide/index.html
Vendor fix Red Hat Product Security RHSA-2019:1543 · 1 productThe References section of this erratum contains a download link (you must log in to download the update). Before applying the update, back up your existing Red Hat JBoss Core Services installation (including all applications and configuration files).
Mitigation from the vendor CISA ICSA-23-348-10 · 5 productsOnly build and run applications from trusted sources.

Advisories and patches

www.openwall.comPatch
curl.haxx.sePatch · Vendor Advisory
www.oracle.comPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed
Metasploit modules: none listed

Sources

CISA-ADPSSVC decisionnone2026-04-15
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.17.82026-04-15
NVDCVSS 3.17.8read 2026-10-23
NVDCVSS 2.04.6read 2026-10-23
CNAweakness (CWE)CWE-122known since 2026-10-23
NVDweakness (CWE)CWE-787read 2026-10-23
FIRST EPSSEPSS score49.7 %read 2026-11-03
OSVaffected packages—
GitHub Advisoriesadvisory—

Identifiers

EUVD-2019-15026same flawENISA EUVD · LicenseRef-ENISA-legal-notice
GHSA-8xvc-p9x4-w7jmsame flawGitHub Advisory Database · CC-BY-4.0
DLA-1804-1advisory covering several CVEsDebian · LicenseRef-unstated
MGASA-2019-0337advisory covering several CVEsMageia · LicenseRef-unstated
openSUSE-SU-2019:1508-1advisory covering several CVEsopenSUSE · LicenseRef-unstated
openSUSE-SU-2024:10582-1advisory covering several CVEsopenSUSE · LicenseRef-unstated
RHSA-2020:1020advisory covering several CVEsRed Hat · CC-BY-4.0
RHSA-2020:1792advisory covering several CVEsRed Hat · CC-BY-4.0
RHSA-2020:2505advisory covering several CVEsRed Hat · CC-BY-4.0
SUSE-SU-2019:1357-1advisory covering several CVEsSUSE · LicenseRef-unstated
SUSE-SU-2019:1357-2advisory covering several CVEsSUSE · LicenseRef-unstated
SUSE-SU-2019:1363-1advisory covering several CVEsSUSE · LicenseRef-unstated
SUSE-SU-2019:14064-1advisory covering several CVEsSUSE · LicenseRef-unstated
SUSE-SU-2019:2009-1advisory covering several CVEsSUSE · LicenseRef-unstated
USN-3993-1advisory covering several CVEsUbuntu
USN-3993-2advisory covering several CVEsUbuntu

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2019-05-28
Last Modified: 2026-10-14
NVD status: Modified
GitHub Advisory: GHSA-8xvc-p9x4-w7jm

Frequently asked questions

What is CVE-2019-5436?

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.

Is CVE-2019-5436 actively exploited?

Active exploitation of CVE-2019-5436 has not been confirmed. Its EPSS score was 49.7% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-5436?

CVE-2019-5436 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Running curl? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this product CISA KEV additions, November 2026 Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
Running this software? Vulnerability monitoring alerts you to new vulnerabilities in your products.

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record

MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

CVE records are reproduced under the CVE Program Terms of Use: MITRE grants a perpetual, royalty-free licence to reproduce and redistribute them, provided this designation and the licence travel with every copy. Read the licence

This product uses data from the NVD API but is not endorsed or certified by the NVD.

Sources and licences of the CVE data