Detections
Analytics

CVE-2021-3156

high

Description

Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character.

References

https://www.synology.com/security/advisory/Synology_SA_21_02

https://www.oracle.com/security-alerts/cpuoct2021.html

https://www.oracle.com/security-alerts/cpuapr2022.html

https://www.oracle.com//security-alerts/cpujul2021.html

https://www.kb.cert.org/vuls/id/794544

https://www.debian.org/security/2021/dsa-4839

https://www.beyondtrust.com/blog/entry/security-advisory-privilege-management-for-unix-linux-pmul-basic-and-privilege-management-for-mac-pmm-affected-by-sudo-vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sudo-privesc-jan2021-qnYQfcM

https://support.apple.com/kb/HT212177

https://security.netapp.com/advisory/ntap-20210128-0002/

https://security.netapp.com/advisory/ntap-20210128-0001/

https://security.gentoo.org/glsa/202101-33

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LHXK6ICO5AYLGFK2TAX5MZKUXTUKWOJY/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CALA5FTXIQBRRYUA2ZQNJXB6OQMAXEII/

https://lists.debian.org/debian-lts-announce/2021/01/msg00022.html

http://www.openwall.com/lists/oss-security/2021/09/14/2

http://www.openwall.com/lists/oss-security/2021/01/27/2

http://www.openwall.com/lists/oss-security/2021/01/27/1

http://seclists.org/fulldisclosure/2021/Feb/42

https://thehackernews.com/2026/08/uat-10147-uses-ai-to-scale-server.html

https://blog.talosintelligence.com/uat-10147-chinese-speaking-adversary-integrates-agentic-ai-into-post-compromise-operations/

https://securityaffairs.com/195941/hacking/thailands-ministry-of-finance-targeted-with-hermes-ai-agent-running-unattended-hades-implant-staged.html

https://securityaffairs.com/180737/apt/nation-state-group-cl-sta-0969-targeted-southeast-asian-telecoms-in-2024.html

https://thehackernews.com/2025/08/cl-sta-0969-installs-covert-malware-in.html

https://unit42.paloaltonetworks.com/infiltration-of-global-telecom-networks/

https://securelist.com/vulnerabilities-and-exploits-in-q1-2025/116624/

https://www.edgescan.com/wp-content/uploads/2024/03/2023-Vulnerability-Statistics-Report.pdf

https://securityaffairs.com/164838/breaking-news/excobalt-cybercrime-group-targets-russian-orgs.html

https://thehackernews.com/2024/06/excobalt-cyber-gang-targets-russian.html

https://www.cisa.gov/news-events/cybersecurity-advisories/aa22-117a

https://www.tenable.com/cyber-exposure/2021-threat-landscape-retrospective

https://github.com/turab-usmani/cve-backport

https://github.com/leosp1983/cve-redhat

https://github.com/keenglomerate/bastion_ai

https://github.com/WhatsWrongAndWhy/CVE-2021-3156

https://github.com/Athology0000/cve-lab

https://github.com/IJBaig/CVE-2021-3156

https://github.com/RaffayAKhan/CVE-Threat-Analysis-and-Risk-Assessment

https://github.com/Kranti08/CVE-2021-3156-Baron-Samedit

https://github.com/philip-xx695/privscan

https://github.com/Robblackcatchai/porfolio-Baron-Samedit

https://github.com/yashmoar11/RAG-poison

https://github.com/nextgensoumen/soc-pulse

https://github.com/sayhi13/CVE-explanations

https://github.com/musanmaz/BoxGuard

https://github.com/Andyyyyuan/CVE-Poc

https://github.com/chiranths09/Syntecxhub_Project_Vulnerability-CVE-Scanner

https://github.com/Rana-Ali93/CVE-2021-3156-Sudo-Buffer-Overflow-Linux

https://github.com/TheLeopard65/CVE-2021-3156-Baron-Samedit

https://github.com/strikoder/LinEnum-ng

https://github.com/SyedNabeel98/CVE-writeups

https://github.com/ZeroPathAI/zeropath-ctf

https://github.com/Npg-1/CVE_Website

https://github.com/Marquez-K/GitHub_Search_CVE

https://github.com/daniel7-li/cve-scanner

https://github.com/Syedomershah99/CVE-semantic-IEEE

https://github.com/VilmarTuminskii/cve-2021-3156-sudo-lab

https://github.com/SWORDIntel/FASTPORT

https://github.com/HuzaifaTariqAfzalKhan/CVE-Exploit-Research-Development-ITSOLERA

https://github.com/zharkaron/cve-2025-zharkaron

https://github.com/Maalfer/Sudo-CVE-2021-3156

https://github.com/ZacharyKirkeby/CVE_a_Week

https://github.com/schoi1337/dockout

https://github.com/Shuhaib88/Baron-Samedit-Heap-Buffer-Overflow-CVE-2021-3156

https://github.com/jlucas8/cve-test-scripts

https://github.com/duongdz96/CVE-2021-3156-main

https://github.com/PuddinCat/GithubRepoSpider

https://github.com/Sornphut/CVE-2021-3156-Heap-Based-Buffer-Overflow-in-Sudo-Baron-Samedit-

https://github.com/hungnqdz/cve

https://github.com/mtai83/khai-th-c-CVE

https://github.com/Bad3r/CVE-2021-3156-without-ip-command

https://github.com/gek64/cve

https://github.com/0xddhub/data

https://github.com/h0pe-ay/Vulnerability-Reproduction

https://github.com/0x4ndy/clif

https://github.com/FrancescoMarchiori/CVE-2021-3156

https://github.com/ypl6/heaplens

https://github.com/RodricBr/CVE-2021-3156

https://github.com/GatoGamer1155/CVE-2021-3156

https://github.com/barebackbandit/CVE-2021-3156

https://github.com/ret2basic/sudoscience

https://github.com/ret2basic/SudoScience

https://github.com/litt1eb0yy/CVE-2021-3156

https://github.com/sharkmoos/Baron-Samedit

https://github.com/halissha/CVE-2021-3156

https://github.com/Bubleh21/CVE-2021-3156

https://github.com/redhawkeye/sudo-exploit

https://github.com/LiveOverflow/pwnedit

https://github.com/Nokialinux/CVE-2021-3156

https://github.com/BearCat4/CVE-2021-3156

https://github.com/lmol/CVE-2021-3156

https://github.com/r3k4t/how-to-solve-sudo-heap-based-bufferoverflow-vulnerability

https://github.com/0xdevil/CVE-2021-3156

https://github.com/perlun/sudo-1.8.3p1-patched

https://github.com/dinhbaouit/CVE-2021-3156

https://github.com/TheSerialiZator/CTF-2021

https://github.com/DanielAzulayy/CTF-2021

https://github.com/DanielAzulay9/CTF-2021

https://github.com/AbdullahRizwan101/Baron-Samedit

https://github.com/Ashish-dawani/CVE-2021-3156-Patch

https://github.com/voidlsd/CVE-2021-3156

https://github.com/apogiatzis/docker-CVE-2021-3156

https://github.com/mbcrump/CVE-2021-3156

https://github.com/ph4ntonn/CVE-2021-3156

https://github.com/ymrsmns/CVE-2021-3156

https://github.com/reverse-ex/CVE-2021-3156

https://www.vicarius.io/vsociety/posts/sudoedit-pwned-cve-2021-3156

https://www.sudo.ws/stable.html#1.9.5p2

https://www.openwall.com/lists/oss-security/2021/01/26/3

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3156

https://kc.mcafee.com/corporate/index?page=content&id=SB10348

http://www.openwall.com/lists/oss-security/2024/01/30/8

http://www.openwall.com/lists/oss-security/2024/01/30/6

http://www.openwall.com/lists/oss-security/2021/02/15/1

http://www.openwall.com/lists/oss-security/2021/01/26/3

http://seclists.org/fulldisclosure/2024/Feb/3

http://seclists.org/fulldisclosure/2021/Jan/79

http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html

http://packetstormsecurity.com/files/161293/Sudo-1.8.31p2-1.9.5p1-Buffer-Overflow.html

http://packetstormsecurity.com/files/161270/Sudo-1.9.5p1-Buffer-Overflow-Privilege-Escalation.html

http://packetstormsecurity.com/files/161230/Sudo-Buffer-Overflow-Privilege-Escalation.html

http://packetstormsecurity.com/files/161160/Sudo-Heap-Based-Buffer-Overflow.html

Details

Source: Mitre, NVD

Published: 2021-01-26

Updated: 2026-06-17

Named Vulnerability: Baron SameditKnown Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 7.2

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 7.8

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.99969