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CVE-2018-16840

MEDIUM
Published 2018-10-31T18:00:00
Actions:

Expert Analysis

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CVSS Score

V3.0
4.3
/10
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.004
probability
of exploitation in the wild

There is a 0.4% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.621
Higher than 62.1% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
LOW
Availability
NONE

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

The Curl Project

curl

Affected Versions:

from 7.59.0 to 7.61.1

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed CRITICAL

GHSA-6vwf-m72q-cw8h

Advisory Details

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.

CVSS Scoring

CVSS Score

9.0

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2018-16840
WEB https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f
WEB https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840
WEB https://curl.haxx.se/docs/CVE-2018-16840.html
WEB https://security.gentoo.org/glsa/201903-03
WEB https://usn.ubuntu.com/3805-1
WEB http://www.securitytracker.com/id/1042013

Advisory provided by GitHub Security Advisory Database. Published: May 13, 2022, Modified: April 17, 2025

References

https://security.gentoo.org/glsa/201903-03
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840
https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f
http://www.securitytracker.com/id/1042013
https://curl.haxx.se/docs/CVE-2018-16840.html
https://usn.ubuntu.com/3805-1/
Published: 2018-10-31T18:00:00
Last Modified: 2024-08-05T10:32:53.993Z
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