CVE-2021-3156 (GCVE-0-2021-3156)

Vulnerability from cvelistv5 – Published: 2021-01-26 00:00 – Updated: 2025-10-21 23:35
VLAI?
Summary
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.
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • n/a
Assigner
References
https://lists.debian.org/debian-lts-announce/2021… mailing-list
http://seclists.org/fulldisclosure/2021/Jan/79 mailing-list
http://www.openwall.com/lists/oss-security/2021/01/26/3 mailing-list
https://security.gentoo.org/glsa/202101-33 vendor-advisory
https://www.debian.org/security/2021/dsa-4839 vendor-advisory
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
http://www.openwall.com/lists/oss-security/2021/01/27/1 mailing-list
http://www.openwall.com/lists/oss-security/2021/01/27/2 mailing-list
https://tools.cisco.com/security/center/content/C… vendor-advisory
https://www.kb.cert.org/vuls/id/794544 third-party-advisory
http://seclists.org/fulldisclosure/2021/Feb/42 mailing-list
http://www.openwall.com/lists/oss-security/2021/02/15/1 mailing-list
https://www.oracle.com//security-alerts/cpujul2021.html
https://www.sudo.ws/stable.html#1.9.5p2
https://www.openwall.com/lists/oss-security/2021/…
http://packetstormsecurity.com/files/161160/Sudo-…
https://security.netapp.com/advisory/ntap-2021012…
https://security.netapp.com/advisory/ntap-2021012…
http://packetstormsecurity.com/files/161230/Sudo-…
http://packetstormsecurity.com/files/161270/Sudo-…
http://packetstormsecurity.com/files/161293/Sudo-…
https://support.apple.com/kb/HT212177
https://kc.mcafee.com/corporate/index?page=conten…
https://www.beyondtrust.com/blog/entry/security-a…
https://www.synology.com/security/advisory/Synolo…
http://www.openwall.com/lists/oss-security/2021/09/14/2 mailing-list
https://www.oracle.com/security-alerts/cpuoct2021.html
https://www.oracle.com/security-alerts/cpuapr2022.html
http://www.openwall.com/lists/oss-security/2024/01/30/8 mailing-list
http://www.openwall.com/lists/oss-security/2024/01/30/6 mailing-list
http://packetstormsecurity.com/files/176932/glibc…
http://seclists.org/fulldisclosure/2024/Feb/3 mailing-list
https://www.vicarius.io/vsociety/posts/sudoedit-p…
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      "cveMetadata": "{\"cveId\": \"CVE-2021-3156\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T23:35:29.600Z\", \"dateReserved\": \"2021-01-15T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2021-01-26T00:00:00.000Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.