Is CVE-2019-5436 in the CISA KEV catalog?

No. CVE-2019-5436 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-5436?

CVE-2019-5436 has a CVSS v3 base score of 7.8 (HIGH).

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

CVE-2019-5436 has an EPSS score of 49.74% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-5436?

Upgrade curl on debian 11 to 7.64.0-4 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2019-5436

HIGHEPSS 99th pctl

7.8

CVSS v3

NVD

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.

CWE-122Heap-based Buffer Overflow CWE-787Out-of-bounds Write

How to fix

Remediation Available

curlDebian

Fixed in:7.64.0-4CVE-2019-5436

curlUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm2USN-3993-2

Fixed in:7.47.0-1ubuntu2.13USN-3993-1

Fixed in:7.58.0-2ubuntu3.7USN-3993-1

libcurl3Ubuntu

Fixed in:7.35.0-1ubuntu2.20+esm2USN-3993-2

Fixed in:7.47.0-1ubuntu2.13USN-3993-1

libcurl3-gnutlsUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm2USN-3993-2

Fixed in:7.47.0-1ubuntu2.13USN-3993-1

Fixed in:7.58.0-2ubuntu3.7USN-3993-1

libcurl3-nssUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm2USN-3993-2

Fixed in:7.47.0-1ubuntu2.13USN-3993-1

Fixed in:7.58.0-2ubuntu3.7USN-3993-1

libcurl4Ubuntu

Fixed in:7.58.0-2ubuntu3.7USN-3993-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

49.74%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Patch3

Third-Party Advisory8

Other references3

Related Vulnerabilities

Other CWE-122 (Heap-based Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2024-26256	High	7.8	88%	-	Fix
CVE-2020-25687	Medium	5.9	87%	-	Fix
CVE-2009-3459	High	8.8	87%	KEV	Fix
CVE-2021-21017	High	8.8	86%	KEV	-
CVE-2020-25683	Medium	5.9	86%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-15.