CVE-2021-4204

HIGH 1 PoC
MEDIUM Priority: 0.09 BB Relevance: 49/100
Published: 2022-08-24 Modified: 2026-11-02 First seen: 2026-11-02 Status: active

Attack Surface

Low Complexity No Interaction Conf. Impact

CVSS Vector Breakdown

AV: Local
AC: Low
PR: Low
UI: None
S: Unchanged
C: High
I: None
A: High

Description

An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation. This flaw allows a local attacker with a special privilege to crash the system or leak internal information.

Affected Software (10)

Proof of Concept (1)

Bug Bounty Relevance

49 / 100
✓ Low complexity
✓ No user interaction
✓ PoC available (1)

CVSS Score

7.1 / 10.0 v3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS — Exploitation Probability

1.24%
Raw Score 0.012450
Percentile 69.4%
Date 2026-11-06

EPSS Trend

2026-11-06
0.01245
2026-11-05
0.01245
2026-11-04
0.01245
2026-11-03
0.01245
2026-11-02
0.01245

Intelligence Sources

mitre ref →
nvd ref →