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Vulnerability details: VCID-yw4r-9jvd-w3gy
Vulnerability ID VCID-yw4r-9jvd-w3gy
Aliases CVE-2019-18634
Summary In Sudo before 1.8.26, if pwfeedback is enabled in /etc/sudoers, users can trigger a stack-based buffer overflow in the privileged sudo process. (pwfeedback is a default setting in Linux Mint and elementary OS; however, it is NOT the default for upstream and many other packages, and would exist only if enabled by an administrator.) The attacker needs to deliver a long string to the stdin of getln() in tgetpass.c.
Status Published
Exploitability 2.0
Weighted Severity 8.0
Risk 10.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-787 Out-of-bounds Write
CWE-121 Stack-based Buffer Overflow
System Score Found at
cvssv3 7.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-18634.json
epss 0.87268 https://api.first.org/data/v1/epss?cve=CVE-2019-18634
epss 0.87268 https://api.first.org/data/v1/epss?cve=CVE-2019-18634
epss 0.87268 https://api.first.org/data/v1/epss?cve=CVE-2019-18634
epss 0.87268 https://api.first.org/data/v1/epss?cve=CVE-2019-18634
epss 0.87268 https://api.first.org/data/v1/epss?cve=CVE-2019-18634
epss 0.87268 https://api.first.org/data/v1/epss?cve=CVE-2019-18634
epss 0.87268 https://api.first.org/data/v1/epss?cve=CVE-2019-18634
epss 0.87268 https://api.first.org/data/v1/epss?cve=CVE-2019-18634
cvssv3.1 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.6 https://nvd.nist.gov/vuln/detail/CVE-2019-18634
cvssv3.1 7.8 https://nvd.nist.gov/vuln/detail/CVE-2019-18634
archlinux High https://security.archlinux.org/AVG-1093
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00029.html
http://packetstormsecurity.com/files/156174/Slackware-Security-Advisory-sudo-Updates.html
http://packetstormsecurity.com/files/156189/Sudo-1.8.25p-Buffer-Overflow.html
https://access.redhat.com/errata/RHSA-2020:0487
https://access.redhat.com/errata/RHSA-2020:0509
https://access.redhat.com/errata/RHSA-2020:0540
https://access.redhat.com/errata/RHSA-2020:0726
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-18634.json
https://api.first.org/data/v1/epss?cve=CVE-2019-18634
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18634
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.debian.org/debian-lts-announce/2020/02/msg00002.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I6TKF36KOQUVJNBHSVJFA7BU3CCEYD2F/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IY6DZ7WMDKU4ZDML6MJLDAPG42B5WVUC/
https://seclists.org/bugtraq/2020/Feb/2
https://seclists.org/bugtraq/2020/Feb/3
https://security.gentoo.org/glsa/202003-12
https://security.netapp.com/advisory/ntap-20200210-0001/
https://www.debian.org/security/2020/dsa-4614
https://www.sudo.ws/alerts/pwfeedback.html
https://www.sudo.ws/security.html
http://www.openwall.com/lists/oss-security/2020/01/30/6
http://www.openwall.com/lists/oss-security/2020/01/31/1
http://www.openwall.com/lists/oss-security/2020/02/05/2
http://www.openwall.com/lists/oss-security/2020/02/05/5
1796944 https://bugzilla.redhat.com/show_bug.cgi?id=1796944
950371 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=950371
ASA-202002-2 https://security.archlinux.org/ASA-202002-2
AVG-1093 https://security.archlinux.org/AVG-1093
cpe:2.3:a:sudo_project:sudo:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sudo_project:sudo:*:*:*:*:*:*:*:*
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:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
CVE-2019-18634 Exploit https://github.com/Plazmaz/CVE-2019-18634/blob/b348e738a83fd4180b3ec26ed216535547f3bb8a/self-contained.sh
CVE-2019-18634 Exploit https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/linux/dos/47995.txt
CVE-2019-18634 Exploit https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/linux/local/48052.sh
CVE-2019-18634 https://nvd.nist.gov/vuln/detail/CVE-2019-18634
USN-4263-1 https://usn.ubuntu.com/4263-1/
USN-4263-2 https://usn.ubuntu.com/4263-2/
Data source Exploit-DB
Date added Feb. 11, 2020
Description Sudo 1.8.25p - 'pwfeedback' Buffer Overflow
Ransomware campaign use Unknown
Source publication date Feb. 6, 2020
Exploit type local
Platform linux
Source update date Aug. 20, 2020
Source URL https://github.com/Plazmaz/CVE-2019-18634/blob/b348e738a83fd4180b3ec26ed216535547f3bb8a/self-contained.sh
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-18634.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:L/UI:N/S:U/C:H/I:H/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:L/AC:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2019-18634
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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2019-18634
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 0.99408
EPSS Score 0.87268
Published At Aug. 16, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:31:59.876690+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.15/main.json 37.0.0