SARA / Free Tools / KEV / CVE-2021-3156

CVE-2021-3156 on CISA KEV

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.

CISA KEV — Actively Exploited

Sudo Heap-Based Buffer Overflow Vulnerability

Vendor / Product
— / Sudo / Sudo
Added to KEV
2022-04-06
BOD 22-01 due
2022-04-27
Ransomware use
Unknown
CVSS / EPSS
— — · EPSS 92.31%

01What CISA says about this vulnerability

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.

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

VendorProductVersions
na / n/an/a

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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Programmatic KEV data?
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