What is CVE-2020-15651?

CVE-2020-15651 is a medium-severity vulnerability in Apple Iphone OS. CVSS score: 4.3/10. Published 2020-08-10.

How severe is CVE-2020-15651?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Apple Iphone OS

CVE-2020-15651

A unicode RTL order character in the downloaded file name can be used to change the file's name during the download UI flow to change the file extension. This vulnerability affects Firefox for iOS < 28.

Published 2020-08-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.8th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Apple Iphone OS
Mozilla Firefox
Mozilla Firefox For iOS — versions unspecified

References

www.mozilla.org/security/advisories/mfsa2020-34/ (Vendor Advisory)
bugzilla.mozilla.org/show_bug.cgi (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2020-15651?: CVE-2020-15651 is a medium-severity vulnerability in Apple Iphone OS. CVSS score: 4.3/10. Published 2020-08-10.
How severe is CVE-2020-15651?: Medium severity. CVSS v3 base score is 4.3 out of 10.