CVE-2021-3156CISA KEVEPSS p99.9%

CVE-2021-3156Sudo Heap-Based Buffer Overflow Vulnerability

Sudo / Sudo

Description

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

Scoring

EPSS99.30% probability of exploitation · percentile 99.9% · 2026-06-15T12:03:41Z

CISA KEV entry

Added to KEV: 2022-04-06

(incoming)1

TypeTargetConfidenceTier
KEVEntrySudo Heap-Based Buffer Overflow Vulnerabilitykev-cve-2021-31560%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

CVE
Linux Kernel Heap Out-of-Bounds Write Vulnerability
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CVE-2026-35083
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CVE-2025-32462
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Linux Kernel Heap-Based Buffer Overflow Vulnerability
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CVE-2026-35535
CVE
Sudo Inclusion of Functionality from Untrusted Control Sphere Vulnerability
Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.