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CVE-2018-16840

Published: Oct 31, 2018Updated: Apr 17, 2025 Sources: CVE List NVDCWE-416
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
3.3%
Top 12.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-416

Affected Products

curlThe Curl Project
Library
OSS Libraries / generic-library
curlhaxxOSS Libraries
ubuntu linuxcanonical
On-premOS
Operating Systems / linux-distro
the curl projectoss-projectOSS Librariesaka curl
haxxoss-projectSEOSS Librariesaka haxx.se
canonicalcommercialGBOperating Systemsaka canonical ltd.

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://security.gentoo.org/glsa/201903-03
security.gentoo.org
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840
bugzilla.redhat.com
https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f
github.com
and 3 more references View all →

Timeline

Published
Oct 31, 2018
Last Updated
Apr 17, 2025

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