Search for vulnerabilities
Vulnerability details: VCID-2q2f-25qg-2kh1
Vulnerability ID VCID-2q2f-25qg-2kh1
Aliases CVE-2018-16841
Summary Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-415 Double Free
CWE-416 Use After Free
System Score Found at
cvssv3 5.7 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-16841.json
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.06788 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.10936 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.10936 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.10936 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.10936 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.10936 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.10936 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.10936 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.11121 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.11121 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
epss 0.11121 https://api.first.org/data/v1/epss?cve=CVE-2018-16841
cvssv3 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.0 https://nvd.nist.gov/vuln/detail/CVE-2018-16841
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2018-16841
archlinux High https://security.archlinux.org/AVG-823
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-16841.json
https://api.first.org/data/v1/epss?cve=CVE-2018-16841
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14629
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16841
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16851
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.netapp.com/advisory/ntap-20181127-0001/
https://www.debian.org/security/2018/dsa-4345
https://www.samba.org/samba/security/CVE-2018-16841.html
http://www.securityfocus.com/bid/106023
1642545 https://bugzilla.redhat.com/show_bug.cgi?id=1642545
ASA-201811-22 https://security.archlinux.org/ASA-201811-22
AVG-823 https://security.archlinux.org/AVG-823
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
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:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
CVE-2018-16841 https://nvd.nist.gov/vuln/detail/CVE-2018-16841
USN-3827-1 https://usn.ubuntu.com/3827-1/
USN-3827-2 https://usn.ubuntu.com/3827-2/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-16841.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:L/UI:N/S:U/C:N/I:N/A:H 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:S/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2018-16841
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-16841
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 0.90918
EPSS Score 0.06788
Published At Aug. 5, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:32:40.623369+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.19/main.json 37.0.0