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Vulnerability details: VCID-hc4j-ezm9-tqe9
Vulnerability ID VCID-hc4j-ezm9-tqe9
Aliases CVE-2020-27840
Summary A flaw was found in samba. Spaces used in a string around a domain name (DN), while supposed to be ignored, can cause invalid DN strings with spaces to instead write a zero-byte into out-of-bounds memory, resulting in a crash. The highest threat from this vulnerability is to system availability.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-125 Out-of-bounds Read
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27840.json
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.07171 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.15679 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.15679 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.15679 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.15679 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.15679 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.15679 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.15679 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
epss 0.15679 https://api.first.org/data/v1/epss?cve=CVE-2020-27840
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2020-27840
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2020-27840
archlinux Medium https://security.archlinux.org/AVG-1732
archlinux Medium https://security.archlinux.org/AVG-1734
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27840.json
https://api.first.org/data/v1/epss?cve=CVE-2020-27840
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10730
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27840
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20277
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.debian.org/debian-lts-announce/2021/03/msg00036.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLZ74IF2N75VQSIHBL4B3P5WKWQCXSRY/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X5J3B6PN5XMXF3OHYBNHDKZ3XFSUGY4L/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZXP3ONIY6MB4C5LDZV4YL5KJCES3UX24/
https://security.gentoo.org/glsa/202105-22
https://security.netapp.com/advisory/ntap-20210326-0007/
https://www.debian.org/security/2021/dsa-4884
https://www.samba.org/samba/security/CVE-2020-27840.html
1941400 https://bugzilla.redhat.com/show_bug.cgi?id=1941400
985936 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=985936
AVG-1732 https://security.archlinux.org/AVG-1732
AVG-1734 https://security.archlinux.org/AVG-1734
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:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
CVE-2020-27840 https://nvd.nist.gov/vuln/detail/CVE-2020-27840
USN-4888-1 https://usn.ubuntu.com/4888-1/
USN-4888-2 https://usn.ubuntu.com/4888-2/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27840.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:3.1/AV:N/AC:L/PR:N/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:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-27840
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:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-27840
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 0.91178
EPSS Score 0.07171
Published At Aug. 16, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:33:03.696910+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.14/main.json 37.0.0