CVE-2021-26281
📋 TL;DR
CVE-2021-26281 is an information disclosure vulnerability in Vivo alarm clock modules where improperly stored parameters leak sensitive information. This affects Vivo smartphone users who have not applied security updates. The vulnerability allows attackers to access potentially sensitive data from affected devices.
💻 Affected Systems
- Vivo smartphones
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access personal information, device identifiers, or other sensitive data stored by the alarm clock module, potentially leading to privacy violations or facilitating further attacks.
Likely Case
Limited information leakage of device-specific parameters or configuration data that could be used for fingerprinting or reconnaissance.
If Mitigated
No data leakage occurs; proper access controls and secure storage prevent unauthorized information disclosure.
🎯 Exploit Status
Exploitation likely requires local access or malicious app installation; no public exploit details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security updates released by Vivo; specific version depends on device model
Vendor Advisory: https://www.vivo.com/en/support/security-advisory-detail?id=9
Restart Required: Yes
Instructions:
1. Check for system updates in device Settings > System Update. 2. Download and install available security updates. 3. Restart device after installation completes.
🔧 Temporary Workarounds
Disable alarm clock permissions
androidRestrict alarm clock app permissions to minimize potential data exposure
Settings > Apps > Alarm Clock > Permissions > Disable unnecessary permissions
Use third-party alarm app
androidReplace vulnerable built-in alarm clock with trusted third-party alternative
Install alternative alarm app from official app store
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement mobile device management (MDM) controls to restrict app permissions and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check device security patch level in Settings > About phone > Android version > Security patch level. If before Vivo's fix release date, likely vulnerable.Check Version:
Settings > About phone > Android versionVerify Fix Applied:
Verify security patch level is updated to latest available version from Vivo.📡 Detection & Monitoring
Log Indicators:
- Unusual alarm clock process activity
- Permission requests from alarm clock app
Network Indicators:
- Unexpected data exfiltration from device
SIEM Query:
Not applicable for typical mobile device scenarios; monitor via MDM solutions instead