CVE-2023-21115 Weak cryptography in Android

What is CVE-2023-21115?

CVE-2023-21115 is a high-severity vulnerability in Google Android, published on 15 Jun 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In btm_sec_encrypt_change of btm_sec.cc, there is a possible way to downgrade the link key type due to improperly used crypto. This could lead to paired device escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-11 Android-12 Android-12LAndroid ID: A-258834033

Weakness: CWE-327

Which versions are affected by CVE-2023-21115?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2023-21115?

Apply the vendor's patch.

Is CVE-2023-21115 being exploited?

There is no known exploitation of CVE-2023-21115 in the wild and no public exploit code.

Other vulnerabilities in Google Android

• CVE-2026-58704 Google Pixel Improper Authorization Exploited High 8.8
• CVE-2025-48543 Android Runtime Use-After-Free Exploited High 8.8
• CVE-2023-35674 Android Framework Privilege Escalation Exploited High 8.8
• CVE-2025-48595 Android Framework Integer Overflow Exploited High 8.4
• CVE-2024-32896 Android Pixel Privilege Escalation Exploited High 8.1

All Google Android vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as A-258834033, ASB-A-258834033, GHSA-8mvr-47qj-w5j5.