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CVE-2018-16840

9.8 · CRITICAL

A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle.

Published Oct 31, 2018CWE-416EPSS 3.40%

Overview

CVE-2018-16840 is a critical-severity vulnerability. It was published on October 31, 2018 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closing and cleaning up an 'easy' handle in the `Curl_close()` function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.securitytracker.com/id/1042013Refbugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840Refcurl.haxx.se/docs/CVE-2018-16840.htmlGitHubgithub.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3fRefsecurity.gentoo.org/glsa/201903-03Refusn.ubuntu.com/3805-1/Refwww.securitytracker.com/id/1042013Refbugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840Refcurl.haxx.se/docs/CVE-2018-16840.htmlGitHubgithub.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f

How CyberStrike helps

Frequently asked questions

What is CVE-2018-16840?

CVE-2018-16840 is a critical-severity vulnerability. It was published on October 31, 2018 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2018-16840?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-16840?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-16840?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-16840 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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