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Vulnerability details: VCID-3g4p-dnnv-aaap
Vulnerability ID VCID-3g4p-dnnv-aaap
Aliases CVE-2020-27837
Summary A flaw was found in GDM in versions prior to 3.38.2.1. A race condition in the handling of session shutdown makes it possible to bypass the lock screen for a user that has autologin enabled, accessing their session without authentication. This is similar to CVE-2017-12164, but requires more difficult conditions to exploit.
Status Published
Exploitability 0.5
Weighted Severity 5.8
Risk 2.9
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
System Score Found at
cvssv3 6.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27837.json
epss 0.00043 https://api.first.org/data/v1/epss?cve=CVE-2020-27837
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epss 0.00056 https://api.first.org/data/v1/epss?cve=CVE-2020-27837
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epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2020-27837
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epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2020-27837
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2020-27837
epss 0.0008 https://api.first.org/data/v1/epss?cve=CVE-2020-27837
rhbs low https://bugzilla.redhat.com/show_bug.cgi?id=1906812
cvssv3.1 3.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.4 https://nvd.nist.gov/vuln/detail/CVE-2020-27837
cvssv3 6.4 https://nvd.nist.gov/vuln/detail/CVE-2020-27837
cvssv3.1 6.4 https://nvd.nist.gov/vuln/detail/CVE-2020-27837
archlinux Low https://security.archlinux.org/AVG-1380
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27837.json
https://api.first.org/data/v1/epss?cve=CVE-2020-27837
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27837
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1906812 https://bugzilla.redhat.com/show_bug.cgi?id=1906812
AVG-1380 https://security.archlinux.org/AVG-1380
cpe:2.3:a:gnome:gnome_display_manager:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:gnome:gnome_display_manager:*:*:*:*:*:*:*:*
CVE-2020-27837 https://nvd.nist.gov/vuln/detail/CVE-2020-27837
No exploits are available.
Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27837.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:P/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N 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:L/AC:M/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-27837
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:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-27837
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:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-27837
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 0.10129
EPSS Score 0.00043
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.