CVE-2021-23253

MEDIUM
5.3
CVSS Score
Published: January 11, 2021 at 03:43 PM UTC
Updated: June 17, 2026 at 03:38 AM UTC
1 product affected across 1 vendorOpera Mini

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.8%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 53.1Below 53.1
Affected range stops below 53.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-Other

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