CVE-2023-21720

FAQ

Why is the severity for this CVE rated as Moderate, but the CVSS score is higher than normal?

Per our severity guidelines, the amount of user interaction or preconditions required to allow this sort of exploitation downgraded the severity, specifically it says, "If a bug requires more than a click, a key press, or several preconditions, the severity will be downgraded". The CVSS scoring system doesn't allow for this type of nuance.

How could an attacker exploit this vulnerability via the Network?

An attacker could host a specially crafted website designed to exploit the vulnerability through Microsoft Edge and then convince a user to view the website. However, in all cases an attacker would have no way to force a user to view the attacker-controlled content. Instead, an attacker would have to convince a user to take action, typically by an enticement in an email or instant message, or by getting the user to open an attachment sent through email.

According to the CVSS metric, successful exploitation of this vulnerability could lead to loss of availability (A:H)? What does that mean for this vulnerability?

Successful exploitation of this vulnerability requires the user to click on a malicious URL or an embedded link in an email message which could lead to denial of service (DOS) or the Browser to crash.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?

Successful exploitation of this vulnerability requires an attacker to take additional actions prior to exploitation to prepare the target environment.

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?

The user would have to click on a specially crafted URL to be compromised by the attacker.