PatchTheCVECVE-2021-40834: A user interface overlay vulnerability was discovered in F-secure SAFE Browser for Android
CVE-2021-40834 is a medium-severity flaw (CVSS 4.3) affecting safe. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A user interface overlay vulnerability was discovered in F-secure SAFE Browser for Android. When user click on a specially crafted seemingly legitimate URL SAFE browser goes into full screen and hides the user interface. A remote attacker can leverage this to perform spoofing attack.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 4.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | High |
| User interaction | Required |
| EPSS exploit chance | 0.8% (top 45%) |
| CISA exploited list | No |
| Weakness | CWE-1021 |
| Published | 2021-12-10 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-40834?
safe: upgrade to newer than 17.9. Exact commands for each OS are on this page.
Is CVE-2021-40834 being exploited?
CVE-2021-40834 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-40834 affect?
CVE-2021-40834 affects safe. Severity is medium (CVSS 4.3). A user interface overlay vulnerability was discovered in F-secure SAFE Browser for Android. When user click on a specially crafted seemingly legitimate URL SAFE browser goes into full screen and hides the user interface. A remote attacker c
How urgent is CVE-2021-40834?
Priority 29/100. No elevated risk signals yet.
Software pages
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