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CVE-2021-39855: Adobe Acrobat Reader DC NTLMv2 SSO Information Disclosure via src Parameter

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-29 · updated 2026-06-17
• Weakness: CWE-200

Description

Acrobat Reader DC ActiveX Control versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by an Information Disclosure vulnerability. An unauthenticated attacker could leverage this vulnerability to obtain NTLMv2 credentials. Exploitation of this issue requires user interaction in that a victim must open a maliciously crafted Microsoft Office file, or visit an attacker controlled web page.

Affected products

• Adobe Acrobat for Edge: from 17.011.30059 through 17.011.30199; from 20.001.30005 through 20.004.30006
• Adobe Acrobat DC: from 15.008.20082 through 21.005.20058; from 15.008.20082 through 21.005.20060
• Adobe Acrobat Reader: from 17.011.30059 through 17.011.30199; from 20.001.30005 through 20.004.30006
• Adobe Acrobat Reader: from 15.008.20082 through 21.005.20058; from 15.008.20082 through 21.005.20060

References

• https://helpx.adobe.com/security/products/acrobat/apsb21-55.html
• https://helpx.adobe.com/security/products/acrobat/apsb21-55.html

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