Cloud Vulnerability DB
A community-led vulnerabilities database
Vulnerability DatabaseCVE-2021-39856
CVE-2021-39856:
Adobe Acrobat Reader Continuous vulnerability analysis and mitigation
Overview
Acrobat Reader DC ActiveX Control experienced an Information Disclosure vulnerability, identified as CVE-2021-39856. The vulnerability affects multiple versions including 2021.005.20060 (and earlier), 2020.004.30006 (and earlier), and 2017.011.30199 (and earlier). The issue was discovered and reported in September 2021, with Adobe Systems Incorporated serving as the assigning CNA (NVD, CVE).
Technical details
The vulnerability is classified as an Information Disclosure issue (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor). It received a CVSS v3.1 Base Score of 6.5 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N, indicating network accessibility, low attack complexity, and no required privileges, though user interaction is necessary (NVD).
Impact
When successfully exploited, this vulnerability allows an unauthenticated attacker to obtain NTLMv2 credentials from the target system. The impact is primarily focused on confidentiality, with no direct effect on system integrity or availability (NVD).
Mitigation and workarounds
Adobe has addressed this vulnerability through security updates. Users should update to the latest version of Acrobat Reader DC to mitigate this vulnerability (Adobe Security).
Additional resources
Source: This report was generated using AI
Related Adobe Acrobat Reader Continuous vulnerabilities:
Free Vulnerability Assessment
Benchmark your Cloud Security Posture
Evaluate your cloud security practices across 9 security domains to benchmark your risk level and identify gaps in your defenses.
Additional Wiz resources
Get a personalized demo
Ready to see Wiz in action?
"Best User Experience I have ever seen, provides full visibility to cloud workloads."
David EstlickCISO
"Wiz provides a single pane of glass to see what is going on in our cloud environments."
Adam FletcherChief Security Officer
"We know that if Wiz identifies something as critical, it actually is."
Greg PoniatowskiHead of Threat and Vulnerability Management