Vulnerability · Published Sep 29, 2021 · Assigned by adobe

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

Medium 6.5

In plain English

A medium-severity information exposure in Acrobat Reader from Adobe. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.4% (higher than 84% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)2.4%top 16.1% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Adobe	Acrobat Reader	unspecified – through 2020.004.30006unspecified – through 2017.011.30199unspecified – through 2021.005.20060unspecified – through None

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References

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