VulnerabilityModified

CVE-2021-23253

This allows a malicious attacker to craft a URL with a long domain name, e.g. www.safe.opera.com.attacker.com.

MEDIUM 5.3EPSS 0.75%

Does this matter?

Lower severity and a low EPSS score (0.75%). Track it; it rarely justifies an emergency change on its own.

Description

Opera Mini for Android below 53.1 displays URL left-aligned in the address field. This allows a malicious attacker to craft a URL with a long domain name, e.g. www.safe.opera.com.attacker.com. With the URL being left-aligned, the user will only see the front part (e.g. www.safe.opera.com…) The exact amount depends on the phone screen size but the attacker can craft a number of different domains and target different phones. Starting with version 53.1 Opera Mini displays long URLs with the top-level domain label aligned to the right of the address field which mitigates the issue.

CVSS 3.1: 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS: 0.75% probability · 53th percentile
CISA KEV: Not listed
Affected: opera/opera mini
Source: security@opera.com

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.