CVE-2019-5436 — A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary co

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.

01What is this vulnerability?

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.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-05-28T19:29:06.127
• Last modified: 2026-10-14T07:16:54.610

09References

• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00008.html
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00017.html
• www.openwall.com — http://www.openwall.com/lists/oss-security/2019/09/11/6
• curl.haxx.se — https://curl.haxx.se/docs/CVE-2019-5436.html
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• seclists.org — https://seclists.org/bugtraq/2020/Feb/36
• security.gentoo.org — https://security.gentoo.org/glsa/202003-29
• security.netapp.com — https://security.netapp.com/advisory/ntap-20190606-0004/
• support.f5.com — https://support.f5.com/csp/article/K55133295
• support.f5.com — https://support.f5.com/csp/article/K55133295?utm_source=f5support&amp%3Butm_medi…