HIGHCVSS v3.1 7.8Actively exploited · CISA KEV since 2022-04-06Vulnerability

CVE-2021-3156

Sudo contains an off-by-one error that can result in a heap-based buffer overflow, which allows for privilege escalation.

Properties

Vulnerability name
Sudo Heap-Based Buffer Overflow Vulnerability
First seen
2025-10-21T23:35:29+00:00
Cvss score
7.8
Epss score
0.99962
Last seen
2026-10-19T12:00:27+00:00
Year
2021
Due date
2022-04-27
Euvd assigner
mitre
Retrieved at
2026-10-21T01:24:47+00:00
Exploited euvd since
2022-04-06T00:00:00+00:00
Src batch id
epss_history-20261020T103617Z-728ddd
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2022-04-06
Score
7.8
Euvd base score version
3.1
Fetched at
2026-10-20T10:36:20+00:00
Updated at
2026-03-02T09:27:22.769211+00:00
Cvss vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
In Signal since
initial import (Sep 2026)
Euvd base score
7.8

Related Entities (42 · showing 25)

AFFECTS_PRODUCT (37 · showing 20)

→[Product]cpe:2.3:o:synology:diskstation_manager:6.2:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:oracle:micros_workstation_6_firmware:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:synology:vs960hd_firmware:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:h:oracle:micros_workstation_5a:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:a:beyondtrust:privilege_management_for_unix\/linux:*:*:*:*:basic:*:*:*
→[Product]cpe:2.3:h:oracle:micros_workstation_6:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:oracle:micros_workstation_5a_firmware:5a:*:*:*:*:*:*:*
→[Product]cpe:2.3:h:oracle:micros_compact_workstation_3:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:a:synology:diskstation_manager_unified_controller:3.0:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:oracle:micros_es400_firmware:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:a:mcafee:web_gateway:10.0.4:*:*:*:*:*:*:*
→[Product]cpe:2.3:h:oracle:micros_kitchen_display_system:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:h:oracle:micros_es400:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:h:synology:skynas:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:synology:skynas_firmware:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:a:beyondtrust:privilege_management_for_mac:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:a:oracle:tekelec_platform_distribution:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:oracle:micros_kitchen_display_system_firmware:210:*:*:*:*:*:*:*
→[Product]cpe:2.3:h:synology:vs960hd:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:a:oracle:communications_performance_intelligence_center:*:*:*:*:*:*:*:*

MENTIONED_IN (2)

→[Campaign]Chinese-speaking adversary integrates agentic AI into post-compromise operations
→[Campaign]Thailand's Ministry of Finance Targeted With Hermes AI Agent Running Unattended, Hades Implant Staged

DESCRIBES (1)

←[KEVEntry]Sudo Heap-Based Buffer Overflow Vulnerability

HAS_WEAKNESS (1)

→[Weakness]Off-by-one Error

INVOLVES (1)

←[Signal]kev_added · 2022-04-06

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CVE-2021-3156 (CVSS v3.1 7.8) — Ninja Signal Threat Intelligence | Ninja Signal