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CVE-2021-21083 : Security Advisory and Response

Learn about CVE-2021-21083 affecting Adobe Experience Manager versions with an access control vulnerability leading to denial-of-service risk. Find mitigation strategies here.

Adobe Experience Manager broken access control in DSRPReindexServlet could lead to denial-of-service

Understanding CVE-2021-21083

This CVE relates to an Improper Access Control vulnerability impacting Adobe Experience Manager versions 6.3.3.8 and below, 6.4.8.3 and below, and 6.5.7.0 and below, including AEM Cloud Service.

What is CVE-2021-21083?

CVE-2021-21083 represents a vulnerability in Adobe Experience Manager that could allow an unauthenticated attacker to trigger a denial-of-service within the context of the current user. The flaw specifically lies in the DSRPReindexServlet component.

The Impact of CVE-2021-21083

With a CVSS base score of 7.5 (High severity), this vulnerability poses a significant risk. An attacker could exploit it over a network without requiring privileges, potentially causing a denial-of-service affecting availability.

Technical Details of CVE-2021-21083

This section explores the specifics of the vulnerability.

Vulnerability Description

The vulnerability arises from improper access control in the DSRPReindexServlet component of Adobe Experience Manager, enabling unauthenticated attackers to disrupt application availability.

Affected Systems and Versions

Adobe Experience Manager versions 6.3.3.8 and below, 6.4.8.3 and below, and 6.5.7.0 and below, as well as AEM Cloud Service, are confirmed to be vulnerable.

Exploitation Mechanism

Attackers can exploit this vulnerability over the network without needing any user interaction, leading to a denial-of-service condition.

Mitigation and Prevention

Protecting against CVE-2021-21083 involves immediate actions and long-term security practices.

Immediate Steps to Take

        Adobe recommends applying patches provided in security bulletin APSB21-15 to mitigate the vulnerability.
        Monitor systems for any suspicious activities that could indicate exploitation of the vulnerability.

Long-Term Security Practices

        Regularly update Adobe Experience Manager and AEM Cloud Service to the latest versions to eliminate known vulnerabilities.
        Implement network segmentation and access controls to limit exposure to potential attacks.

Patching and Updates

Stay informed about security advisories from Adobe and promptly apply recommended patches to keep systems secure.

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