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CVE-2021-28557: Adobe Acrobat Reader out-of-bounds read in PDFLibTool could lead to information exposure

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-02 · updated 2026-06-17
• Weakness: CWE-125

Description

Acrobat Reader DC versions versions 2021.001.20150 (and earlier), 2020.001.30020 (and earlier) and 2017.011.30194 (and earlier) are affected by an Out-of-bounds Read vulnerability. An unauthenticated attacker could leverage this vulnerability to leak sensitive system information 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 for Edge: from 17.011.30059 through 17.011.30194; from 20.001.30005 through 20.001.30020
• Adobe Acrobat DC: from 15.008.20082 through 21.001.20150
• Adobe Acrobat Reader: from 17.011.30059 through 17.011.30194; from 20.001.30005 through 20.001.30020
• Adobe Acrobat Reader: from 15.008.20082 through 21.001.20150

References

• https://helpx.adobe.com/security/products/acrobat/apsb21-29.html
• https://helpx.adobe.com/security/products/acrobat/apsb21-29.html

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