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Vulnerability details: VCID-juzu-eydf-aaaa
Vulnerability ID VCID-juzu-eydf-aaaa
Aliases CVE-2018-16840
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 8.8
Risk 4.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2018/CVE-2018-16840.html
rhas Important https://access.redhat.com/errata/RHSA-2019:1543
cvssv3 5.0 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-16840.json
epss 0.00369 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
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epss 0.00369 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00369 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00369 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00369 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00369 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00369 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
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epss 0.00438 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00438 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00438 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
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epss 0.0046 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
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epss 0.0046 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
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epss 0.0046 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.0046 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.0046 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.0046 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00501 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00501 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00501 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00501 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
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epss 0.00501 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
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epss 0.00501 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00537 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00537 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00556 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00556 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00715 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00830 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00830 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00830 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00830 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00830 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00830 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00830 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00830 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00830 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00830 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
epss 0.00830 https://api.first.org/data/v1/epss?cve=CVE-2018-16840
rhbs low https://bugzilla.redhat.com/show_bug.cgi?id=1642203
generic_textual Medium https://curl.haxx.se/docs/CVE-2018-16840.html
cvssv3.1 Low https://curl.se/docs/CVE-2018-16840.html
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16840
cvssv3 4.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2018-16840
cvssv3 9.8 https://nvd.nist.gov/vuln/detail/CVE-2018-16840
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2018-16840
archlinux High https://security.archlinux.org/AVG-795
archlinux High https://security.archlinux.org/AVG-796
archlinux High https://security.archlinux.org/AVG-797
archlinux High https://security.archlinux.org/AVG-798
archlinux High https://security.archlinux.org/AVG-799
archlinux High https://security.archlinux.org/AVG-800
generic_textual Medium https://ubuntu.com/security/notices/USN-3805-1
Reference id Reference type URL
http://people.canonical.com/~ubuntu-security/cve/2018/CVE-2018-16840.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-16840.json
https://api.first.org/data/v1/epss?cve=CVE-2018-16840
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840
https://curl.haxx.se/docs/CVE-2018-16840.html
https://curl.se/docs/CVE-2018-16840.html
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16840
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f
https://security.gentoo.org/glsa/201903-03
https://ubuntu.com/security/notices/USN-3805-1
https://usn.ubuntu.com/3805-1/
http://www.securitytracker.com/id/1042013
1642203 https://bugzilla.redhat.com/show_bug.cgi?id=1642203
ASA-201811-4 https://security.archlinux.org/ASA-201811-4
ASA-201811-5 https://security.archlinux.org/ASA-201811-5
ASA-201811-6 https://security.archlinux.org/ASA-201811-6
ASA-201811-7 https://security.archlinux.org/ASA-201811-7
ASA-201811-8 https://security.archlinux.org/ASA-201811-8
ASA-201811-9 https://security.archlinux.org/ASA-201811-9
AVG-795 https://security.archlinux.org/AVG-795
AVG-796 https://security.archlinux.org/AVG-796
AVG-797 https://security.archlinux.org/AVG-797
AVG-798 https://security.archlinux.org/AVG-798
AVG-799 https://security.archlinux.org/AVG-799
AVG-800 https://security.archlinux.org/AVG-800
cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
CVE-2018-16840 https://nvd.nist.gov/vuln/detail/CVE-2018-16840
RHSA-2019:1543 https://access.redhat.com/errata/RHSA-2019:1543
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-16840.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2018-16840
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-16840
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-16840
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.55867
EPSS Score 0.00369
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.