CVE-2023-5521

CRITICAL

kernelsu < 0.6.9 - Incorrect Authorization

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2023-5521. PoCs published by Ylarod.

AI-analyzed exploit summary This PoC demonstrates a signature spoofing vulnerability in KernelSU (CVE-2023-5521), allowing root takeover. The code includes utilities to check and manipulate APK signature blocks, specifically targeting the APK Sig Block 42 format.

Description

Incorrect Authorization in GitHub repository tiann/kernelsu prior to v0.6.9.

Exploits (1)

nomisec WORKING POC 19 stars
by Ylarod · poc
https://github.com/Ylarod/CVE-2023-5521

This PoC demonstrates a signature spoofing vulnerability in KernelSU (CVE-2023-5521), allowing root takeover. The code includes utilities to check and manipulate APK signature blocks, specifically targeting the APK Sig Block 42 format.

Classification
Working Poc 90%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: KernelSU (version not specified)
No auth needed
Prerequisites: Access to a vulnerable KernelSU installation · Ability to modify APK files
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (2)

Core 2

Scores

CVSS v3 9.8
EPSS 0.0058
EPSS Percentile 43.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

CWE
CWE-863
Status published
Products (1)
kernelsu/kernelsu < 0.6.9
Published Oct 11, 2023
Tracked Since Feb 18, 2026