2021-28640 | Adobe Acrobat Reader use after free (APSB21-51)

By Max On Jul 17, 2021

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.3	$5k-$25k	0.38

A vulnerability was found in Adobe Acrobat Reader up to 2017.011.30197/2020.004.30005/2021.005.20054 (Document Reader Software). It has been classified as critical. This affects some unknown processing. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-416. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was published 07/13/2021 as APSB21-51. The advisory is shared at helpx.adobe.com. This vulnerability is uniquely identified as CVE-2021-28640 since 03/16/2021. The exploitability is told to be easy. It is possible to initiate the attack remotely. Required for exploitation is a authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/17/2021).

Upgrading to version 2017.011.30199, 2020.004.30006 or 2021.005.20058 eliminates this vulnerability.

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