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CVE-2021-21089: Adobe Acrobat Reader DC URI Parsing Out-Of-Bounds Read

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-30 · updated 2026-06-17
• Weakness: CWE-125

Description

Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are affected by an out-of-bounds Read vulnerability. An unauthenticated attacker could leverage this vulnerability to locally escalate privileges 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 Acrobat DC: from 20.006.20034 through 20.013.20074; from 20.001.30005 through 20.001.30018; from 17.011.30158 through 17.011.30188
• Adobe Acrobat Reader: from 20.006.20034 through 20.013.20074; from 20.001.30005 through 20.001.30018; from 17.011.30158 through 17.011.30188

References

• https://helpx.adobe.com/security/products/acrobat/apsb21-09.html
• https://helpx.adobe.com/security/products/acrobat/apsb21-09.html

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