CVE-2021-21122 is a high-severity vulnerability that affects Google Chrome and Microsoft Edge Chromium prior to specific versions. This vulnerability allows for a use after free scenario in the Blink rendering engine, which can lead to heap corruption when an attacker crafts a malicious HTML page. The CVSS score for this vulnerability is 8.8, indicating a high level of severity. Organizations utilizing affected versions should be aware of the potential risks associated with exploitation.
Risk to organizations includes unauthorized access and disruption of service due to potential exploitation of this vulnerability. Attackers may leverage this vulnerability to execute arbitrary code or perform other malicious actions. It is critical to assess the exposure of systems running affected versions of browsers to the risk associated with this vulnerability.
Organizations should prioritize patching immediately. The vulnerability was published on February 9, 2021, and affects all versions of Google Chrome before 88.0.4324.96 and Microsoft Edge Chromium before 88.0.705.50. It is essential for organizations to apply the latest updates to mitigate these risks.
Currently, there are no known exploits publicly available for this vulnerability, but the exploitability status remains high due to its nature and the potential for remote exploitation.
Vulnerability Details
The official description of CVE-2021-21122 states that it involves use after free in Blink in Google Chrome prior to version 88.0.4324.96. The vulnerability is classified as CVE-416 under the CWE classification, which indicates that it is a memory corruption issue. The vulnerability has a CVSS score of 8.8, with a high severity rating indicating significant potential impact.
The affected products include Google Chrome and Microsoft Edge Chromium. The specific versions vulnerable are all versions prior to Google Chrome 88.0.4324.96 and Microsoft Edge Chromium 88.0.705.50. The vulnerability was disclosed on February 9, 2021.
Technical Analysis
The root cause of CVE-2021-21122 lies in the improper management of memory. Specifically, the vulnerability occurs due to a use after free condition in the Blink component of Google Chrome, which can lead to heap corruption. This specific flaw is categorized as having a low attack complexity, requiring no special privileges or authentication from the attacker, but it does necessitate user interaction.
The attack vector for this vulnerability is over the network, and it can significantly impact the confidentiality, integrity, and availability of affected systems. The impact is high as successful exploitation could allow attackers to execute arbitrary code, potentially leading to further exploitation or denial of service.
Risk & Impact Analysis
Real-world deployment risk associated with CVE-2021-21122 is substantial given the widespread use of Google Chrome and Microsoft Edge Chromium. Organizations must understand that this vulnerability can lead to serious security breaches, particularly for those with a large user base or those that allow file uploads or other user-generated content.
The potential blast radius of this vulnerability is significant; an attacker could exploit it to gain control over systems running vulnerable versions of the browsers. Given the high CVSS score and the nature of the vulnerability, immediate action is required to mitigate risks associated with this flaw.
The urgency for organizations is high. The vulnerability has been assessed with a CVSS score of 8.8, indicating that it poses a serious risk. As there is no current exploitation reported, this may provide a brief window for organizations to mitigate the issue before it becomes a target.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of the software include all versions of Google Chrome prior to 88.0.4324.96 and Microsoft Edge Chromium prior to 88.0.705.50. Organizations should ensure they update to the latest versions immediately to mitigate this vulnerability.
Mitigation & Remediation
To remediate CVE-2021-21122, organizations should apply the latest patches for Google Chrome and Microsoft Edge Chromium. The patches are available from the respective vendors. Should immediate patching not be feasible, organizations should consider implementing network controls to limit exposure and monitor for any unusual activities related to the affected browsers.
For further details on security testing, organizations can explore penetration testing services to identify similar vulnerabilities in their environments.
Detection Guidance
Organizations should monitor logs for any unusual access patterns, particularly those involving the affected browsers. Behavioral anomalies such as unexpected crashes or performance degradation may indicate exploitation attempts. Additionally, network signatures associated with the exploitation of heap corruption could provide further indicators.
AppSecure Threat Intelligence Insight
CVE-2021-21122 represents a critical learning opportunity for security teams. The vulnerability highlights the importance of maintaining updated software and the potential consequences of failing to patch known vulnerabilities. As organizations increasingly rely on web technologies, understanding and mitigating such vulnerabilities is paramount.
For additional insights on maintaining security posture, organizations can refer to our penetration testing methodology and our approach to vulnerability management as part of a broader security strategy.
Finally, organizations should consider our API penetration testing guide as they assess their overall security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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