Security readout for executives and security teams
CVE-2019-5436 is a heap buffer overflow in curl/libcurl's TFTP receive handling. Affected versions are 7.19.4 through 7.64.1. Sources describe potential denial of service or arbitrary code execution. Business urgency is highest where vulnerable curl/libcurl is used in applications, scripts, appliances, or OS packages that handle TFTP transfers. Exposure is most likely in systems running curl/libcurl 7.19.4 through 7.64.1 where TFTP functionality is used or reachable through dependent software. Also check Linux distributions, appliances, and vendor products that bundle libcurl rather than relying only on the system curl binary. Prioritize remediation for infrastructure or products using TFTP with curl/libcurl, and for appliances where bundled libraries are harder to see. The issue is older but high impact; unresolved vulnerable dependencies represent maintenance debt with potential service disruption or code execution consequences. Mitigation focus: Upgrade curl/libcurl to 7.65.0 or a vendor backported fixed package.; Apply relevant OS and appliance vendor security advisories promptly.; Disable or avoid libcurl TFTP use until patched where feasible..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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Open ATT&CK lookupExecution behavior lookup
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Open ATT&CK lookupCVE-2019-5436 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
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CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- FEDORA-2019-697de0501fCVE reference · vendor-advisory, x_refsource_FEDORA
- DSA-4633CVE reference · vendor-advisory, x_refsource_DEBIAN
- 20200225 [SECURITY] [DSA 4633-1] curl security updateCVE reference · mailing-list, x_refsource_BUGTRAQ
- GLSA-202003-29CVE reference · vendor-advisory, x_refsource_GENTOO
- https://www.oracle.com/security-alerts/cpuapr2020.htmlCVE reference · x_refsource_MISC
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.htmlCVE reference · x_refsource_MISC
- https://www.oracle.com/security-alerts/cpuoct2020.htmlCVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20190606-0004/CVE reference · x_refsource_CONFIRM
- https://curl.haxx.se/docs/CVE-2019-5436.htmlCVE reference · x_refsource_CONFIRM
- https://support.f5.com/csp/article/K55133295CVE reference · x_refsource_CONFIRM
- https://support.f5.com/csp/article/K55133295?utm_source=f5support&%3Butm_medium=RSSCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.