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CVE-2021-21099: Adobe InDesign PCX file parsing out-of-bounds write vulnerability could lead to remote code execution

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-28 · updated 2026-06-17
• Weakness: CWE-787

Description

Adobe InDesign version 16.0 (and earlier) is affected by an Out-of-bounds Write vulnerability when parsing a crafted file. An unauthenticated attacker could leverage this vulnerability to achieve remote code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Affected products

• Adobe InDesign Desktop: through 16.0

References

• https://helpx.adobe.com/security/products/indesign/apsb21-22.html
• https://helpx.adobe.com/security/products/indesign/apsb21-22.html

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