ACTIVELY EXPLOITED
CVE-2021-3156: Sudo Heap-Based Buffer Overflow Vulnerability
| Vendor | Sudo |
|---|---|
| Product | Sudo |
| Actively exploited | Yes |
| Added to CISA KEV | 6 Apr 2022 |
| CISA federal deadline | 27 Apr 2022 |
| Weakness (CWE) | CWE-122, CWE-193 |
Required action (CISA's text)
Apply updates per vendor instructions.
Description (NVD)
Sudo contains an off-by-one error that can result in a heap-based buffer overflow, which allows for privilege escalation.
SOURCES
Other Sudo flaws
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.