CVE-2019-5436

Exp

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: 2019-05-28 Last update: 2026-04-15 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-5436 is rated High Exploit Risk (77/100): CVSS High severity, with high exploitation likelihood (EPSS 13.27%, 94th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2019-5436

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2019-5436

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-09 15.48% 13.27% -2.21%
2 2026-05-06 13.58% 15.48% +1.90%
3 2026-04-23 — 13.58% —

Full EPSS history (52 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-5436

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0
4.6 2.0 MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 6.4 [email protected]

Weakness enumeration for CVE-2019-5436

OS Trackers for CVE-2019-5436

vendor priority summary link
alpine — CVE-2019-5436: 2 source package rows (curl, gnurl); 12 state rows across 12 repos (3.10-main, 3.11-main, 3.12-main, 3.17-community, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-community, edge-main); fixed 12, open 0. https://security.alpinelinux.org/vuln/CVE-2019-5436
debian not yet assigned CVE-2019-5436 not yet assigned priority: Debian including 1 source packages (curl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-5436
gentoo normal CVE-2019-5436: 1 GLSA(s) (202003-29), 1 atom(s) (net-misc/curl); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2019-5436
redhat low — https://access.redhat.com/security/cve/CVE-2019-5436
suse medium CVE-2019-5436 severity moderate: SUSE including 371 source package names (0.1.0:libcurl4-7.60.0-3.20.1, 0.1.75:libcurl4-7.60.0-3.20.1, …), 460 product×package rows across 97 product lines (Container caasp/v4/389-ds, Container caasp/v4/busybox, … (97 product lines)): Fixed 294, Known Affected 157, Known Not Affected 9. https://www.suse.com/security/cve/CVE-2019-5436/
ubuntu medium CVE-2019-5436 medium priority: Ubuntu including 1 source packages (curl), 6 status rows across 6 suites (bionic, cosmic, disco, trusty, upstream, xenial): released 6. https://ubuntu.com/security/CVE-2019-5436

Affected software / configurations for CVE-2019-5436

Vendor Product Version Raw CPE
haxx libcurl >= 7.19.4, <= 7.64.1 cpe:2.3:a:haxx:libcurl:*:*:*:*:*:*:*:*
opensuse leap 15.0 cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*
opensuse leap 15.1 cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
opensuse leap 42.3 cpe:2.3:o:opensuse:leap:42.3:*:*:*:*:*:*:*
fedoraproject fedora 29 cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
f5 traffix_signaling_delivery_controller >= 5.0.0, <= 5.1.0 cpe:2.3:a:f5:traffix_signaling_delivery_controller:*:*:*:*:*:*:*:*
netapp hci_management_node — cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*
netapp solidfire — cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*
netapp steelstore_cloud_integrated_storage — cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:*
oracle enterprise_manager_ops_center 12.3.3 cpe:2.3:a:oracle:enterprise_manager_ops_center:12.3.3:*:*:*:*:*:*:*
oracle enterprise_manager_ops_center 12.4.0 cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0:*:*:*:*:*:*:*
oracle mysql_server <= 5.7.27 cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
oracle mysql_server >= 5.7.28, <= 8.0.17 cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
oracle oss_support_tools 20.0 cpe:2.3:a:oracle:oss_support_tools:20.0:*:*:*:*:*:*:*

References for CVE-2019-5436

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00008.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00017.html Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/09/11/6 Mailing List Patch Third Party Advisory
https://curl.haxx.se/docs/CVE-2019-5436.html Exploit Patch Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SMG3V4VTX2SE3EW3HQTN3DDLQBTORQC2/
https://seclists.org/bugtraq/2020/Feb/36 Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202003-29 Third Party Advisory
https://security.netapp.com/advisory/ntap-20190606-0004/ Third Party Advisory
https://support.f5.com/csp/article/K55133295 Third Party Advisory
https://support.f5.com/csp/article/K55133295?utm_source=f5support&amp%3Butm_medium=RSS
https://www.debian.org/security/2020/dsa-4633 Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2020.html Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2020.html
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html Patch Third Party Advisory
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