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CVE-2021-3156 Details

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

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CNA: CISA-ADPCVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

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

see all 68 references

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	Apr 6, 2022	Apr 27, 2022	Apply updates per vendor instructions.

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-193	Off-by-one Error	[email protected]
CWE-193	Off-by-one Error	CISA-ADP

Affected Products

Product	Versions
sudo project sudo	>= 1.8.2, < 1.8.32 >= 1.9.0, < 1.9.5 1.9.5 - 1.9.5 patch1
CPE cpe:2.3:a:sudo_project:sudo:::::::: cpe:2.3:a:sudo_project:sudo:1.9.5:-:::::: cpe:2.3:a:sudo_project:sudo:1.9.5:patch1:::::: Remediation No remediation found in references.
fedoraproject fedora	32 33
CPE cpe:2.3:o:fedoraproject:fedora:32:::::::* cpe:2.3:o:fedoraproject:fedora:33:::::::* Remediation No remediation found in references.
debian debian linux	9.0 10.0
CPE cpe:2.3:o:debian:debian_linux:9.0:::::::* cpe:2.3:o:debian:debian_linux:10.0:::::::* Remediation No remediation found in references.
netapp active iq unified manager	All versions
CPE cpe:2.3:a:netapp:active_iq_unified_manager:-:::::vmware_vsphere:: Remediation No remediation found in references.
netapp cloud backup	All versions
CPE cpe:2.3:a:netapp:cloud_backup:-:::::::* Remediation No remediation found in references.
netapp hci management node	All versions
CPE cpe:2.3:a:netapp:hci_management_node:-:::::::* Remediation No remediation found in references.
netapp oncommand unified manager core package	All versions
CPE cpe:2.3:a:netapp:oncommand_unified_manager_core_package:-:::::::* Remediation No remediation found in references.
netapp ontap select deploy administration utility	All versions
CPE cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:::::::* Remediation No remediation found in references.
netapp ontap tools	9
CPE cpe:2.3:a:netapp:ontap_tools:9:::::vmware_vsphere:: Remediation No remediation found in references.
netapp solidfire	All versions
CPE cpe:2.3:a:netapp:solidfire:-:::::::* Remediation No remediation found in references.
mcafee web gateway	8.2.17 9.2.8 10.0.4
CPE cpe:2.3:a:mcafee:web_gateway:8.2.17:::::::* cpe:2.3:a:mcafee:web_gateway:9.2.8:::::::* cpe:2.3:a:mcafee:web_gateway:10.0.4:::::::* Remediation No remediation found in references.
synology diskstation manager unified controller	3.0
CPE cpe:2.3:a:synology:diskstation_manager_unified_controller:3.0:::::::* Remediation No remediation found in references.
synology diskstation manager	6.2
CPE cpe:2.3:o:synology:diskstation_manager:6.2:::::::* Remediation No remediation found in references.
synology skynas firmware	All versions
CPE cpe:2.3:o:synology:skynas_firmware:-:::::::* Remediation No remediation found in references.
synology skynas	All versions
CPE cpe:2.3:h:synology:skynas:-:::::::* Remediation No remediation found in references.
synology vs960hd firmware	All versions
CPE cpe:2.3:o:synology:vs960hd_firmware:-:::::::* Remediation No remediation found in references.
synology vs960hd	All versions
CPE cpe:2.3:h:synology:vs960hd:-:::::::* Remediation No remediation found in references.
beyondtrust privilege management for mac	< 21.1.1
CPE cpe:2.3:a:beyondtrust:privilege_management_for_mac:::::::: Remediation No remediation found in references.
beyondtrust privilege management for unix/linux	< 10.3.2-10
CPE cpe:2.3:a:beyondtrust:privilege_management_for_unix/linux:::::basic:::* Remediation No remediation found in references.
oracle micros compact workstation 3 firmware	310
CPE cpe:2.3:o:oracle:micros_compact_workstation_3_firmware:310:::::::* Remediation No remediation found in references.
oracle micros compact workstation 3	All versions
CPE cpe:2.3:h:oracle:micros_compact_workstation_3:-:::::::* Remediation No remediation found in references.
oracle micros es400 firmware	>= 400, <= 410
CPE cpe:2.3:o:oracle:micros_es400_firmware:::::::: Remediation No remediation found in references.
oracle micros es400	All versions
CPE cpe:2.3:h:oracle:micros_es400:-:::::::* Remediation No remediation found in references.
oracle micros kitchen display system firmware	210
CPE cpe:2.3:o:oracle:micros_kitchen_display_system_firmware:210:::::::* Remediation No remediation found in references.
oracle micros kitchen display system	All versions
CPE cpe:2.3:h:oracle:micros_kitchen_display_system:-:::::::* Remediation No remediation found in references.
oracle micros workstation 5a firmware	5a
CPE cpe:2.3:o:oracle:micros_workstation_5a_firmware:5a:::::::* Remediation No remediation found in references.
oracle micros workstation 5a	All versions
CPE cpe:2.3:h:oracle:micros_workstation_5a:-:::::::* Remediation No remediation found in references.
oracle micros workstation 6 firmware	>= 610, <= 655
CPE cpe:2.3:o:oracle:micros_workstation_6_firmware:::::::: Remediation No remediation found in references.
oracle micros workstation 6	All versions
CPE cpe:2.3:h:oracle:micros_workstation_6:-:::::::* Remediation No remediation found in references.
oracle communications performance intelligence center	>= 10.3.0.0.0, <= 10.3.0.2.1 >= 10.4.0.1.0, <= 10.4.0.3.1
CPE cpe:2.3:a:oracle:communications_performance_intelligence_center:::::::: Remediation No remediation found in references.
oracle tekelec platform distribution	>= 7.4.0, <= 7.7.1
CPE cpe:2.3:a:oracle:tekelec_platform_distribution:::::::: Remediation No remediation found in references.

Change History

52 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	CISA-ADP
Jun 17, 2026	CVE Modified	[email protected]
Nov 10, 2025	Modified Analysis	[email protected]
Oct 22, 2025	CVE Modified	CISA-ADP
Oct 21, 2025	CVE Modified	CISA-ADP
Oct 21, 2025	CVE Modified	CISA-ADP
Apr 3, 2025	Modified Analysis	[email protected]
Feb 3, 2025	CVE Modified	CISA-ADP
Jan 14, 2025	CPE Deprecation Remap	[email protected]
Nov 21, 2024	CVE Modified	CVE
Sep 19, 2024	Modified Analysis	[email protected]
Sep 18, 2024	CVE Modified	[email protected]
Jul 9, 2024	Modified Analysis	[email protected]
May 14, 2024	CVE Modified	[email protected]
Feb 4, 2024	CVE Modified	[email protected]
Jan 31, 2024	CVE Modified	[email protected]
Jan 30, 2024	CVE Modified	[email protected]
Nov 7, 2023	CVE Modified	[email protected]
Sep 3, 2022	Modified Analysis	[email protected]
Apr 20, 2022	CVE Modified	[email protected]
Apr 4, 2022	Modified Analysis	[email protected]
Oct 20, 2021	CVE Modified	[email protected]
Sep 27, 2021	Reanalysis	[email protected]
Sep 16, 2021	Modified Analysis	[email protected]
Sep 15, 2021	CVE Modified	[email protected]
Jul 20, 2021	CVE Modified	[email protected]
Mar 26, 2021	Modified Analysis	[email protected]
Mar 16, 2021	CVE Modified	[email protected]
Mar 8, 2021	Modified Analysis	[email protected]
Feb 23, 2021	CVE Modified	[email protected]
Feb 19, 2021	CVE Modified	[email protected]
Feb 18, 2021	Modified Analysis	[email protected]
Feb 15, 2021	CVE Modified	[email protected]
Feb 13, 2021	CVE Modified	[email protected]
Feb 12, 2021	CVE Modified	[email protected]
Feb 11, 2021	Modified Analysis	[email protected]
Feb 9, 2021	CVE Modified	[email protected]
Feb 5, 2021	CVE Modified	[email protected]
Feb 5, 2021	CVE Modified	[email protected]
Feb 3, 2021	Initial Analysis	[email protected]
Feb 3, 2021	CVE Modified	[email protected]
Feb 1, 2021	CVE Modified	[email protected]
Jan 29, 2021	CVE Modified	[email protected]
Jan 28, 2021	CVE Modified	[email protected]
Jan 28, 2021	CVE Modified	[email protected]
Jan 27, 2021	CVE Modified	[email protected]
Jan 27, 2021	CVE Modified	[email protected]
Jan 27, 2021	CVE Modified	[email protected]
Jan 27, 2021	CVE Modified	[email protected]
Jan 27, 2021	CVE Modified	[email protected]
Jan 27, 2021	CVE Modified	[email protected]
Jan 26, 2021	CVE Modified	[email protected]

CVE-2021-3156 Details

Description

Metrics

References to Advisories, Solutions, and Tools

This CVE is in CISA's Known Exploited Vulnerabilities Catalog

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