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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-3156 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
http://packetstormsecurity.com/files/161160/Sudo-Heap-Based-Buffer-Overflow.html CVE, MITRE Exploit  Third Party Advisory  VDB Entry 
http://packetstormsecurity.com/files/161230/Sudo-Buffer-Overflow-Privilege-Escalation.html CVE, MITRE Exploit  Third Party Advisory  VDB Entry 
http://packetstormsecurity.com/files/161270/Sudo-1.9.5p1-Buffer-Overflow-Privilege-Escalation.html CVE, MITRE Exploit  Third Party Advisory  VDB Entry 
http://packetstormsecurity.com/files/161293/Sudo-1.8.31p2-1.9.5p1-Buffer-Overflow.html CVE, MITRE Exploit  Third Party Advisory  VDB Entry 
http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html CVE, MITRE Exploit  Third Party Advisory  VDB Entry 
http://seclists.org/fulldisclosure/2021/Feb/42 CVE, MITRE Mailing List  Third Party Advisory 
http://seclists.org/fulldisclosure/2021/Jan/79 CVE, MITRE Exploit  Mailing List  Third Party Advisory 
http://seclists.org/fulldisclosure/2024/Feb/3 CVE, MITRE Exploit  Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/01/26/3 CVE, MITRE Exploit  Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/01/27/1 CVE, MITRE Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/01/27/2 CVE, MITRE Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/02/15/1 CVE, MITRE Exploit  Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/09/14/2 CVE, MITRE Mailing List  Patch  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2024/01/30/6 CVE, MITRE Exploit  Mailing List 
http://www.openwall.com/lists/oss-security/2024/01/30/8 CVE, MITRE Mailing List 
https://kc.mcafee.com/corporate/index?page=content&id=SB10348 CVE, MITRE Broken Link  Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2021/01/msg00022.html CVE, MITRE Mailing List  Third Party Advisory 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CALA5FTXIQBRRYUA2ZQNJXB6OQMAXEII/ CVE, MITRE Mailing List  Release Notes 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LHXK6ICO5AYLGFK2TAX5MZKUXTUKWOJY/ CVE, MITRE Mailing List  Release Notes 
https://security.gentoo.org/glsa/202101-33 CVE, MITRE Third Party Advisory 
https://security.netapp.com/advisory/ntap-20210128-0001/ CVE, MITRE Third Party Advisory 
https://security.netapp.com/advisory/ntap-20210128-0002/ CVE, MITRE Third Party Advisory 
https://support.apple.com/kb/HT212177 CVE, MITRE Third Party Advisory 
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sudo-privesc-jan2021-qnYQfcM CVE, MITRE Third Party Advisory 
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 CVE, MITRE Third Party Advisory 
https://www.debian.org/security/2021/dsa-4839 CVE, MITRE Third Party Advisory 
https://www.kb.cert.org/vuls/id/794544 CVE, MITRE Third Party Advisory  US Government Resource 
https://www.openwall.com/lists/oss-security/2021/01/26/3 CVE, MITRE Exploit  Mailing List  Third Party Advisory 
https://www.oracle.com//security-alerts/cpujul2021.html CVE, MITRE Patch  Third Party Advisory 
https://www.oracle.com/security-alerts/cpuapr2022.html CVE, MITRE Patch  Third Party Advisory 
https://www.oracle.com/security-alerts/cpuoct2021.html CVE, MITRE Patch  Third Party Advisory 
https://www.sudo.ws/stable.html#1.9.5p2 CVE, MITRE Release Notes 
https://www.synology.com/security/advisory/Synology_SA_21_02 CVE, MITRE Third Party Advisory 
https://www.vicarius.io/vsociety/posts/sudoedit-pwned-cve-2021-3156 MITRE Exploit  Third Party Advisory 

This CVE is in CISA's Known Exploited Vulnerabilities Catalog

Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.

Vulnerability Name Date Added Due Date Required Action
Sudo Heap-Based Buffer Overflow Vulnerability 04/06/2022 04/27/2022 Apply updates per vendor instructions.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-193 Off-by-one Error cwe source acceptance level NIST   CISA-ADP  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

46 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-3156
NVD Published Date:
01/26/2021
NVD Last Modified:
04/03/2025
Source:
MITRE