CVE-2021-21053: 
Adobe Illustrator vulnerability analysis and mitigation

Adobe Illustrator version 25.1 and earlier versions are affected by an Out-of-bounds Write vulnerability (CVE-2021-21053) when parsing a crafted file. The vulnerability was disclosed on February 11, 2021, and affects Adobe Illustrator software installations (NVD, ZDI Advisory).

The vulnerability is specifically related to the parsing of DWG files in Adobe Illustrator. The issue stems from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated structure. The vulnerability has been assigned a CVSS v3.1 base score of 7.8 (High), with the vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The weakness is classified as CWE-787 (Out-of-bounds Write) (ZDI Advisory, NVD).

If successfully exploited, this vulnerability could allow an unauthenticated attacker to achieve arbitrary code execution in the context of the current user. The impact of successful exploitation could result in complete compromise of the affected system's confidentiality, integrity, and availability (NVD).

Exploitation of this vulnerability requires user interaction, specifically that a victim must open a malicious file. The attack complexity is considered low, requiring no privileges, but does need user interaction to open a crafted DWG file (NVD, ZDI Advisory).

Adobe has released security updates to address this vulnerability. Users are advised to update to the latest version of Adobe Illustrator beyond version 25.1. The fix was detailed in Adobe's security bulletin APSB21-12 (Adobe Advisory).